JP2019128805A - Bus side connector, device side connector, and reading system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid unintended reading of a CAN frame transmitted via a serial bus, unintended input of a CAN frame to the serial bus, and mixing of noise into the serial bus. SOLUTION: A connector attached to a serial bus so that a connector 2 connected to a reader for reading a CAN frame transmitted via a serial bus for CAN communication can be electrically connected to the serial bus. The electrode 12-1, which is 1, and the conductor portion 15 to be detected which is electrically connected to the conductors LW1a, LW2a ... 12-2 ..., And when the connector 2 is connected to the connector 1, the conductor portion 15 to be detected can be capacitively coupled to the conductor portion 25 for detection in the connector 2 via the insulating coating 16. The electrodes 12-1, 12-2, ... Are held by the base 11. [Selection diagram] Fig. 4

Description

  The present invention comprises a bus-side connector connected to a serial bus for CAN communication, a device-side connector configured to be connectable to the bus-side connector and connected to a reading device, and a device-side connector and the reading device The present invention relates to a reading system configured to be able to read a CAN frame from a serial bus.

  For example, in the following patent documents, a CAN / K-Line (a serial bus for CAN communication and K-Line communication: hereinafter also simply referred to as "serial bus") disposed in a vehicle (car) is used to An invention of a vehicle information acquisition device configured to be able to acquire various types of information is disclosed. In this case, in the example disclosed in the patent document, an engine electronic control unit (hereinafter, also simply referred to as an "electronic control unit") is connected to a serial bus via a communication circuit, and is prepared for this serial bus. Failure diagnosis connector (connector for connecting external device to serial bus: hereinafter also referred to as "bus side connector") can be easily distinguished from vehicle information acquisition device connector (hereinafter referred to as "bus side connector" above) In order to achieve this, a configuration is adopted in which information (such as a CAN frame) transmitted from an electronic control device or the like is read from a serial bus by connecting an “device-side connector”.

Japanese Patent Laying-Open No. 2013-6505 (page 2-5, FIG. 1)

  However, the vehicle information acquisition device disclosed in the above patent document and the serial bus connected to the vehicle information acquisition device have the following problems to be solved. Specifically, the serial bus disclosed in the above patent document is provided with a bus-side connector to which an external device such as a vehicle information acquisition device can be connected, and the vehicle information acquisition device includes a serial bus. A device-side connector that can be connected to the provided bus-side connector is provided. Thus, in the example disclosed in the above patent document, by connecting the device-side connector to the bus-side connector, the vehicle information acquisition device is connected to the serial bus and it is possible to read a CAN frame or the like from the serial bus It becomes.

  In this case, a plurality of connection terminals are arranged on the bus side connector corresponding to various signal lines such as “CANH (CAN high)”, “CANL (CAN low)”, and “SG”. The device-side connector also has a plurality of connection terminals that can be electrically connected in contact with the connection terminals of the bus-side connector. That is, in the example of the serial bus (bus-side connector) and the vehicle information acquisition device (device-side connector), the connection terminals of the device-side connector are in direct contact with the connection terminals of the bus-side connector. Thus, a configuration in which corresponding connection terminals are electrically connected to each other is adopted.

  In addition, the connector shape of the bus-side connector and the device-side connector described above, and “connections connected to signal lines for CAN communication such as“ CANH ”,“ CANL ”, and“ SG ”among the connection terminals of both connectors The arrangement position of the “terminal” is determined by a standard and is known. In particular, for connectors used in the field of vehicles (automobiles) (the bus-side connector and the device-side connector described above), general-purpose connectors whose connector shapes and arrangement positions of connection terminals conform to the standard are on the market By obtaining these, it is possible to easily read electrical signals (digital signals such as CAN frames) from each signal line of the serial bus.

  Further, even if the general-purpose connector is not provided, as described above, since the arrangement position of the connection terminal corresponding to each signal line is known, the terminal insertion hole of the bus side connector (the connection terminal of the device side connector etc. Easy to read electric signal (digital signal such as CAN frame) from each signal line of serial bus by inserting pin-like connection terminal into hole for contacting with connection terminal of bus side connector by inserting Is possible.

  As described above, in the example disclosed in the above-mentioned patent documents, the contact terminal capable of making direct contact with the connection terminal of the device-side connector is disposed on the bus-side connector, whereby the installer of the serial bus (for example, It is possible to easily connect the device-side connectors of various devices not intended by the vehicle manufacturer) to the bus-side connector. In this case, as long as the CAN frame transmitted via the serial bus is simply read, even if a device unintended by the installer is connected, there is no serious problem.

  However, for example, in the field of vehicles (automobiles), there is a use form in which various information such as a current position, a running state, and a running history are transmitted to a recording device and a display device via a serial bus. Therefore, for example, when a reader capable of wireless communication conforming to wireless communication standards such as 3G (registered trademark), LTE (registered trademark), and Wi-fi (registered trademark) is connected to the serial bus, Various types of information including the above information read from the serial bus may be leaked to malicious third parties.

  In addition, in the bus side connector and the device side connector configured to directly contact the connection terminals, not only the CAN frame transmitted via the serial bus is read by the external device but also the CAN frame from the external device to the serial bus. Can also be easily executed. For this reason, a malicious CAN frame is input from the external device to the serial bus, and transmission of the original CAN frame to be transmitted via the serial bus may be hindered, or the electronic control device or the like may malfunction. There is. Furthermore, when an external device that has a rough circuit configuration and is a noise source is connected to the serial bus, it is transmitted to the electronic control device or the like due to the noise output from the external device to the serial bus. There is also a risk that an important CAN frame to be made becomes difficult to read.

  In addition, some CAN communications other than for vehicles (automobiles) are not standardized in terms of connector shape, arrangement position of each connection terminal, etc., but the connection terminal of the bus side connector and the device side connector By adopting a configuration in which the connection terminals are brought into direct contact and electrically connected, the same problem as in the above example in the use of a vehicle (automobile) occurs.

  The present invention has been made in view of such a problem to be solved. Unintentional reading of a CAN frame transmitted via a serial bus, unintentional input of a CAN frame to the serial bus, and serial bus The present invention provides a bus-side connector and a device-side connector that can preferably avoid noise contamination, and a reading system that enables a legitimate user to read a CAN frame transmitted via a serial bus. As the main purpose.

  In order to achieve the above object, a bus-side connector according to claim 1 is provided with a device-side connector connected to a reading device that reads a CAN frame transmitted from a serial bus for CAN communication from the serial bus. A bus-side connector mounted on the serial bus so as to be electrically connectable to the serial bus, the bus-side conductor portion electrically connected to the lead by being brought into direct contact with the lead of the serial bus A bus-side electrode covered with an insulating coating, and the bus-side conductor portion is insulated from the device-side conductor portion of the device-side connector when the device-side connector is connected to the bus-side connector. The bus-side electrode is held by the bus-side base portion so as to be capable of capacitive coupling through the coating.

  A bus-side connector according to a second aspect is the bus-side connector according to the first aspect, wherein the bus-side electrode is disposed inside a cylindrical portion provided on the bus-side base.

  According to a third aspect of the present invention, in the bus-side connector according to the second aspect, the tubular portion is formed so that the inner cross-sectional shape is a predetermined shape that is non-circular.

  The bus-side connector according to claim 4 is the bus-side connector according to any one of claims 1 to 3, wherein the bus-side connector includes a plurality of the bus-side electrodes and is arranged in an arrangement interval and an arrangement direction of the adjacent bus-side electrodes. The respective bus-side electrodes are held by the bus-side base so that at least one is in a different state in at least one place.

  The device-side connector according to claim 5 is configured to be connectable to a bus-side connector attached to a serial bus for CAN communication, and reads a CAN frame transmitted via the serial bus from the serial bus. A device-side connector connected to a device, wherein when connected to the bus-side connector, the bus-side conductor portion is connected to the bus-side conductor portion via an insulating coating covering the bus-side conductor portion of the bus-side electrode of the bus-side connector. On the other hand, a device-side electrode having a device-side conductor that can be capacitively coupled is held by a device-side base.

  The device-side connector according to claim 6 is the device-side connector according to claim 5, wherein the bus-side electrode is connectable to the bus-side connector disposed inside the tubular portion and can be inserted into the tubular portion. An insertion portion is provided at the device side base.

  The device-side connector according to claim 7 is the device-side connector according to claim 6, wherein the insertion portion is formed so as to be insertable into the cylindrical portion formed in a non-round-shaped predetermined shape. .

  The device-side connector according to claim 8 is the device-side connector according to any one of claims 5 to 7, wherein the device-side connector includes a plurality of the bus-side electrodes and is arranged in the arrangement interval and arrangement direction of the adjacent bus-side electrodes. The apparatus is provided with a plurality of the apparatus-side electrodes connectable to the bus-side connector held by the bus-side base such that at least one is in a different state in at least one place, and the apparatus is adjacent The arrangement interval and arrangement direction of the side electrodes are defined according to the arrangement interval and arrangement direction of the bus side electrodes, and the device side electrodes are held by the device side base.

  A reading system according to claim 9 comprises the device-side connector according to any one of claims 5 to 8 and the reading device, wherein the reading device is the bus-side conductor connected to the wire of the serial bus. A voltage detection unit that detects a voltage of a part via the device-side conductor in the device-side electrode and outputs a voltage signal that changes according to the detected voltage, and the bus-side conductor based on the voltage signal A voltage generation unit that generates a voltage following the voltage, a measurement unit that measures the voltage of the bus-side conductor unit based on the voltage generated by the voltage generation unit, and the measurement unit that measures the voltage And a processing unit that specifies the CAN frame transmitted through the serial bus based on a change in voltage.

  In the bus-side connector according to claim 1, the bus-side electrode in which the bus-side conductor portion electrically connected to the lead by being brought into direct contact with the lead in the serial bus for CAN communication is covered with the insulating coating. The bus-side electrode is connected to the bus-side connector so that the bus-side conductor can be capacitively coupled to the device-side conductor of the device-side connector via an insulation coating when the device-side connector is connected to the bus-side connector. Is held by. Further, in the device side connector according to claim 5, when connected to the bus side connector, a device capable of capacitively coupling to the bus side conductor portion via the insulating coating covering the bus side conductor portion of the bus side electrode. A device side electrode having a side conductor portion is held by the device side base.

  Therefore, according to the bus-side connector of claim 1 and the device-side connector of claim 5, the bus-side conductor portion of the bus-side connector connected to the conductor of the serial bus is covered with the insulating coating. Since the electrical signal (CAN frame) cannot be read by bringing the connection terminal into direct contact with the bus-side conductor, the situation where the CAN frame transmitted via the serial bus is abused is preferably avoided. Also, it should be transmitted because the connection terminals can not be brought into direct contact with the bus-side conductor to input electrical signals (CAN frame) or noise can not be mixed in from the bus-side conductor. A situation in which transmission of a regular CAN frame is hindered can be preferably avoided. Also, by connecting the device-side connector to the bus-side connector that cannot directly contact the connection terminal with the bus-side conductor, an electrical signal corresponding to the CAN frame is transmitted from the bus-side connector to the device-side connector. Therefore, an authorized user of the serial bus can reliably and easily read the CAN frame from the serial bus.

  In the bus-side connector according to the second aspect, the bus-side electrode is disposed inside the cylindrical portion provided on the bus-side base. In the device-side connector according to the sixth aspect, the device-side base is provided with the insertion portion which can be inserted into the tubular portion so that the bus-side electrode can be connected to the bus-side connector disposed inside the tubular portion. There is. Therefore, according to the bus-side connector of claim 2 and the device-side connector of claim 6, since the bus-side electrode of the bus-side connector is protected by the cylindrical portion when the device-side connector is not connected The bus-side electrode can be suitably prevented from being damaged, and the device-side conductor portion of the device-side electrode is connected to the bus-side conductor portion of the bus-side electrode by attaching the device-side connector to the bus-side connector Can be in a state of being capacitively coupled, so that the CAN frame can be reliably and easily read from the serial bus.

  In the bus-side connector according to the third aspect, the tubular portion is formed so that the inner cross-sectional shape is a non-circular shape and a predetermined shape. In the apparatus-side connector according to the seventh aspect, the insertion portion is formed so as to be insertable into a cylindrical portion formed in a non-circular circular predetermined shape. Therefore, according to the bus-side connector according to claim 3 and the device-side connector according to claim 7, the insertion mode of each insertion portion with respect to each cylindrical portion, that is, the device side with respect to the bus-side connector (each bus-side electrode). Since the connection mode of the connector (each device-side electrode) can be limited to one way, it is possible to suitably avoid the occurrence of erroneous connection.

  In the bus-side connector according to claim 4, each bus-side electrode is held by the bus-side base such that at least one of the arrangement interval and the arrangement direction of adjacent bus-side electrodes is different in at least one place. . In the device-side connector according to claim 8, the arrangement interval and the arrangement direction of the adjacent device-side electrodes are defined in accordance with the arrangement interval and the arrangement direction of each bus-side electrode in the bus-side connector Is held by the apparatus-side base. Therefore, according to the bus-side connector according to claim 4 and the device-side connector according to claim 8, the connection mode of the device-side connector (each device-side electrode) with respect to the bus-side connector (each bus-side electrode) is unified. Since the limitation can be made, occurrence of erroneous connection can be suitably avoided.

  The reading system according to claim 9 includes the device-side connector and the reading device, and the reading device transmits the voltage of the bus-side conductor connected to the conductor of the serial bus via the device-side conductor in the device-side electrode. Generated by a voltage detection unit that outputs a voltage signal that changes in accordance with the detected voltage, a voltage generation unit that generates a voltage that follows the voltage of the bus side conductor based on the voltage signal, and a voltage generation unit And a processing unit for specifying a CAN frame transmitted via the serial bus based on a change in voltage measured by the measurement unit. .

  Therefore, according to the reading system of the ninth aspect, the bus side conductor portion and the device side can be obtained from the bus side connector in which the connection terminal can not be brought into direct contact with the bus side conductor portion connected to the serial bus lead. An electric signal corresponding to the CAN frame can be reliably read through capacitive coupling with the conductor portion.

FIG. 5 is a connection mode diagram showing an example of a state in which the serial bus SB and the reading device 3 of the reading system 100 are connected via the connectors 1 and 2; It is a block diagram for demonstrating the structure of the connectors 1 and 2. FIG. It is a sectional view for explaining the structure of connectors 1 and 2. It is sectional drawing of the state which cut away the connectors 1 and 2 of the state shown in FIG. It is a partially transparent perspective view for demonstrating the structure of the connectors 1 and 2. FIG. FIG. 5 is an explanatory diagram for describing an example of the arrangement of each electrode 12 of the connector 1 and each electrode 22 of the connector 2; 1 is a configuration diagram of a reading system 100. FIG. It is sectional drawing for demonstrating the structure of the connector 1A which concerns on the connector 1 and other embodiment. It is sectional drawing which shows the shape of the to-be-inserted part 18b, the insertion part 28b, etc. in the connectors 1B and 2B which concern on other embodiment. It is sectional drawing which shows the structure of the connectors 1C and 2C which concern on other embodiment.

  Hereinafter, embodiments of the bus side connector, the device side connector, and the reading system will be described with reference to the accompanying drawings.

  First, examples of “bus side connector”, “device side connector”, and “reading system” will be described with reference to the accompanying drawings.

  The serial bus SB shown in FIG. 1 is an in-vehicle communication network that is an example of “a serial bus for CAN communication”, and a plurality of nodes N1, N2,... Nn (hereinafter referred to as “node N” when not distinguished). Connected to each node N, various CAN frames can be transmitted. The serial bus SB is connected to a connector 1 to which a connector 2 for connecting the reading device 3 in the reading system 100 to the serial bus SB can be connected.

  In this case, as shown in FIG. 2, the signal cable Ca constituting the serial bus SB is an insulating wire LW1a, LW2a,... LWna (an example of “serial bus wire”: ) And is configured. Each of the above nodes N includes various control devices such as a power source control device, a braking mechanism control device, a steering mechanism control device, a suspension mechanism control device, an air conditioner control device, an illuminator control device, and an audio device control device, It is comprised with the detector (sensor) etc. which output various sensor signals with respect to these control apparatuses.

  In order to facilitate understanding of the configurations of the "bus side connector", the "apparatus side connector" and the "reading system", the serial bus SB and each node N in the example of FIG. Similar to existing in-vehicle networks such as devices and serial buses, they are connected to each other through a normal connection connector that is electrically connected by bringing the connection terminals into direct contact (physical contact) with each other. I assume.

  The connector 1 is an example of a “bus-side connector that is attached to the serial bus so that the device-side connector can be electrically connected to the serial bus”, and as shown in FIG. 2, the electrodes 12-1, 12- 2,... 12-n (an example of “bus side electrode”: hereinafter referred to as “electrode 12” when not distinguished) is formed by a base 11 (an example of “bus side base”) formed of an insulating resin material. It is comprised so that it may be hold | maintained and the connector 2 can be connected.

  In this case, as shown in FIGS. 3 and 4, the electrode 12 is a cylindrical rod that is electrically connected to the lead LWa by being brought into direct contact (physically connected) to the lead LWa. A detection conductor portion 15 (an example of a “bus-side conductor portion”) and an insulation coating 16 (an example of an “insulation coating”) integrally formed with the base 11 so as to cover the detection conductor portion 15 It is configured. Further, as shown in FIG. 5, the base 11 is provided with the partition wall 17, and a portion into which an inserted portion 18 (an electrode 22 (insertion portion 28) of the connector 2 described later) which is an inner space of the partition 17 is inserted: The electrode 12 is disposed inside the “tubular portion”. In this case, in the connector 1 of this embodiment, as an example, the inner cross-sectional shape of the partition wall 17, that is, the hole shape of the inserted portion 18 is formed in a circular shape.

  Further, in the connector 1 of this example, each electrode 12 is formed by the base 11 so that the arrangement interval of the adjacent electrodes 12 and 12 and the arrangement direction of the adjacent electrodes 12 and 12 are different at a plurality of locations. Is retained.

  Specifically, as shown in FIG. 6, the electrode 12-a, which is one of the electrodes 12-1 to 12-n, and the other one of the electrodes 12-1 to 12-n. The arrangement interval Pab with the electrode 12-b, the electrode 12-e which is still another one of the electrodes 12-1 to 12-n, and the other one of the electrodes 12-1 to 12-n The arrangement interval Pef of the electrode 12-f, which is one of the two, is the arrangement interval Pbc of the electrode 12-b and the electrode 12-c which is another one of the electrodes 12-1 to 12-n, and This is different from an arrangement interval Pde between the electrode 12-d and the electrode 12-e, which is still another one of the electrodes 12-1 to 12-n.

  Further, an electrode 12-g which is still another one of the electrodes 12-1 to 12-n and an electrode 12-h which is another one of the electrodes 12-1 to 12-n The arrangement direction (the direction along the alternate long and short dash line Qgh), the electrode 12-j which is another one of the electrodes 12-1 to 12-n, and the other one of the electrodes 12-1 to 12-n The arrangement direction (the direction along the alternate long and short dash line Qjk) with the electrode 12-k, which is one of the above, etc., is the electrode 12-h and the other one of the electrodes 12-1 to 12-n. Arrangement direction with 12-i (direction along dashed-dotted line Qhi), and arrangement with electrode 12-k and electrode 12-1 which is still another one of electrodes 12-1 to 12-n This is different from the direction (direction along the two-dot chain line Qkl).

  The connector 2 is an example of “a device-side connector configured to be connectable to a bus-side connector and connected to a reading device”. As shown in FIG. 2, the electrodes 22-1 22-2,. 22-n (an example of “device side electrode”: hereinafter referred to as “electrode 22” when not distinguished) is held by a base 21 (an example of “device side base”) formed of an insulating resin material. As shown in FIG. 1, it is connected to the reader 3 via a connection cable Cb. In this case, as shown in FIG. 2, the signal cable Cb is configured to include conductive wires LW1b, LW2b,... LWnb (hereinafter also referred to as “conductive wire LWb” when not distinguished).

  Further, as shown in FIGS. 3 and 4, the electrode 22 is a cylindrical detection electrode which is electrically connected to the lead LWb by being brought into direct contact (physically connected) with the lead LWb. A conductor portion 25 (an example of “device-side conductor portion”) is provided. In this case, in the connector 2 of this example, as shown in FIG. 5, the peripheral surface of the detection conductor portion 25 is covered with the insulating coating 26, and the electrode 22 is formed in a cylindrical shape as a whole.

  As shown in FIGS. 3 and 4, in the connector 2 of this example, the diameter of the inner space 27 of the electrode 22 (detection conductor portion 25) (the inner diameter of the detection conductor portion 25) is the same as that of the electrode 12 in the connector 1. The diameter is defined to be equal to the outer diameter, and the outer diameter of the electrode 22 (insertion portion 28: an example of the “insertion portion”) is defined to be equal to the outer diameter of the insertion portion 18 of the connector 1. Thereby, in the connector 2 of this example, as shown in FIG. 3, when the electrode 22 (insertion portion 28) is inserted into the insertion portion 18 of the connector 1 when connecting to the connector 1, the electrode of the connector 1 is 12 (detection conductor portion 15) is positioned with respect to 12 (detection conductor portion 15), and the detection conductor portion 15 of the connector 1 and the detection conductor portion 25 of the connector 2 are insulated from the connector 1. Capacitively coupled via the coating 16 is obtained.

  Further, in the connector 2 of this example, the arrangement interval between the adjacent electrodes 22 and 22 and the arrangement direction of the adjacent electrodes 22 and 22 are the same as the arrangement interval and the arrangement direction of the electrodes 12 in the connector 1 described above. Correspondingly, each electrode 22 (detection conductor portion 25) is held by the base 21 so as to be in a different state in a plurality of places.

  Specifically, as shown in FIG. 6, the electrode 22-a which is one of the electrodes 22-1 to 22-n and the other one of the electrodes 22-1 to 22-n. An arrangement interval Pab with the electrode 22-b, and another one of the electrodes 22-1 to 22-n, the electrode 22-e, and another one of the electrodes 22-1 to 22-n An arrangement interval Pef of the electrode 22-f, which is one of the two, is an arrangement interval Pbc of the electrode 22-b and an electrode 22-c which is another one of the electrodes 22-1 to 22-n, and This is different from the arrangement interval Pde between the electrode 22-d and the electrode 22-e, which is still another one of the electrodes 22-1 to 22-n.

  Further, an electrode 22-g which is still another one of the electrodes 22-1 to 22-n and an electrode 22-h which is another one of the electrodes 22-1 to 22-n An arrangement direction (a direction along the alternate long and short dash line Qgh), and another one of the electrodes 22-1 to 22-n, the electrode 22-j, and the other of the electrodes 22-1 to 22-n The arrangement direction (direction along the alternate long and short dash line Qjk) with the electrode 22-k, which is one of the above, etc., is the electrode which is the other one of the electrode 22-h and the electrodes 22-1 to 22-n. Arrangement direction with 22-i (direction along dashed-dotted line Qhi), and arrangement with electrode 22-k and electrode 22-1 which is another one of electrodes 22-1-22-n This is different from the direction (direction along the two-dot chain line Qkl).

  The reading device 3 is an example of a “reading device”, and constitutes the reading system 100 in combination with the connector 2 and the connection cable Cb. As shown in FIG. 7, the reading device 3 includes a main power supply circuit 31, a DC / DC converter (hereinafter, also simply referred to as “converter”) 32, a voltage detection unit 33, a resistor 34 for current-voltage conversion, a voltage generation unit 35, a voltmeter 36, an operation unit 37, a display unit 38, and a processing unit 39. In the figure, in order to facilitate understanding of the configuration of the reading device 3, one electrode 12 corresponding to one conductor LWa and one conductor for the signal cables Ca, Cb and connectors 1, 2. Only one electrode 22 corresponding to LWb is shown.

  The main power supply circuit 31 has the same positive voltage Vdd and negative voltage Vss (actual values generated with reference to the potential of the ground G1 as the first reference potential) for operating the components 33 to 39 of the reading device 3. , DC voltages different in polarity from each other). Converter 32 includes, for example, an isolated transformer having a primary winding and a secondary winding electrically isolated from each other, a drive circuit for driving the primary winding of the transformer, and induction in the secondary winding of the transformer. And a DC converter (not shown) that rectifies and smoothes the AC voltage that is applied, and is configured as an insulated power source in which the secondary side is electrically insulated from the primary side.

  In this converter 32, the drive circuit operates based on the input positive voltage Vdd and negative voltage Vss, and drives the primary winding of the transformer in a state where the positive voltage Vdd is applied to the secondary winding with an AC voltage. Induces. Further, the DC conversion unit rectifies and smoothes this AC voltage. Thus, positive voltage Vf + and negative voltage Vf− with reference to the internal reference potential (second reference potential) G2 on the secondary side are floating from the secondary side of converter 32 (ground G1, positive voltage Vdd and negative). Electrically isolated from the voltage Vss). The positive voltage Vf + and the negative voltage Vf− as floating voltages generated in this way are supplied to the voltage detector 33 together with the second reference potential G2. The positive voltage Vf + and the negative voltage Vf− are generated as direct current voltages having substantially the same absolute value and different polarities.

  The voltage detection unit 33 includes a current-voltage conversion circuit 33a, an integration circuit 33b, a drive circuit 33c, and an insulation circuit 33d (a photocoupler driven by the drive circuit 33c is illustrated as an example, but an insulation transformer is used instead of the photocoupler. Various other configurations may be employed, such as the configuration to be used), and the positive voltage Vf + and the negative voltage from the converter 32 are set in a state where the reference potential in the voltage detection unit 33 is defined to the second reference potential G2 described above. It operates with the supply of voltage Vf-.

  In the current-voltage conversion circuit 33a, as an example, the non-inverting input terminal is connected to a portion defined by the second reference potential G2 in the voltage detection unit 33 via a resistor (hereinafter also referred to as “connected to the second reference potential G2”). ) And the inverting input terminal is connected to the conducting wire LWb of the connection cable Cb (that is, the detection conductor portion 25 of the connector 2 connected via the conducting wire LWb), and the feedback resistor is connected to the inverting input terminal and the output. A first operational amplifier connected between the terminals is provided.

  In the current-voltage conversion circuit 33a, the first operational amplifier operates with the positive voltage Vf + and the negative voltage Vf-, and the conductor LWa (that is, the conductor to be detected connected to the conductor LWa) is transmitted during transmission of the CAN frame to the serial bus SB. Part 15) (hereinafter also referred to simply as “voltage V1 of the conductor part 15 to be detected”) and the second reference potential G2 (also the voltage of the voltage signal V4 output from the voltage generator 35). The detection current (current signal) I flowing between the connector 1 and the detection conductor 25 with a current value corresponding to the potential difference Vdi is converted to a detection voltage signal V2 and output. In this case, the amplitude of the detection voltage signal V2 changes in proportion to the amplitude of the current signal I.

  For example, the integrating circuit 33b has a non-inverting input terminal connected to the second reference potential G2 via a resistor, an inverting input terminal connected to the output terminal of the first operational amplifier via an input resistor, and feedback. A capacitor is provided with a second operational amplifier connected between the inverting input terminal and the output terminal. In the integrating circuit 33b, the second operational amplifier operates with the positive voltage Vf + and the negative voltage Vf−, and integrates the detection voltage signal V2, whereby the integration signal V3 whose voltage value changes in proportion to the potential difference Vdi. Is generated and output.

  The drive circuit 33c drives the insulation circuit 33d in the linear region according to the level of the integration signal V3, and the driven insulation circuit 33d electrically separates the integration signal V3 to generate a new integration signal (first signal). ) Output as V3a. That is, the voltage detection unit 33 outputs an integration signal V3a indicating the voltage V1 of the conductor portion 15 to be detected in combination with the connector 2 (electrode 22).

  The current / voltage converting resistor 34 has one end connected to the negative voltage Vss and the other end connected to a corresponding insulating circuit 33d in the voltage detection unit 33 (in this example, the collector terminal of the phototransistor in the photocoupler). ing.

  The voltage generator 35 receives and amplifies the integration signal V3a, thereby generating a voltage signal V4 and applying it to a portion defined by the second reference potential G2 in the voltage detector 33. The voltage signal V4 changes in accordance with the voltage V1 of the conductor portion 15 to be detected as described later. As a result, the positive voltage Vf + and the negative voltage Vf−, which are floating voltages based on the second reference potential G2, become floating voltages that change according to the voltage of the voltage signal V4.

  The voltage generation unit 35 includes the second reference potential G2 of the voltage detection unit 33 (the shield of the connection cable Cb having the same potential as the second reference potential G2), the detection conductor 25 and the voltage detection unit 33 (current voltage conversion circuit 33a). By forming a feedback loop together with the integration circuit 33b, the drive circuit 33c, and the insulation circuit 33d (photocoupler in this example), an amplification operation for amplifying the integration signal V3a so as to reduce the potential difference Vdi is performed. V4 is generated.

  Further, the voltage generation unit 35 is configured to include, as an example, an amplification circuit 35a, a phase compensation circuit 35b, and a boost circuit 35c. Here, the amplification circuit 35a generates the voltage signal V4a by inputting and amplifying the integral signal V3a. In this case, the amplification circuit 35a generates a voltage signal V4a in which the absolute value of the voltage value changes in response to the increase / decrease of the absolute value of the voltage value of the integration signal V3a by the amplification operation.

  The phase compensation circuit 35b receives the voltage signal V4a, adjusts its phase, and outputs it as the voltage signal V4b in order to stabilize the feedback control operation (prevent oscillation). The booster circuit 35c is configured using a booster transformer as an example, and generates a voltage signal V4 by boosting the voltage signal V4b at a predetermined magnification (by increasing the absolute without changing the polarity). 2 Applied to reference potential G2. The voltmeter 36 is an example of a “measurement unit”, measures the voltage signal V4 with reference to the potential of the ground G1, converts the voltage value into digital data, and outputs it as voltage data Dv.

  The operation unit 37 designates the type of the serial bus SB to which the reading device 3 is connected, an operation condition for reading a CAN frame from the serial bus SB, and the like, and instructs start / stop of various processes by the processing unit 39. And various operation switches (not shown), and outputs an operation signal corresponding to the switch operation to the processing unit 39. The display unit 38 displays various types of information specified based on the CAN frame read from the serial bus SB as described later under the control of the processing unit 39.

  The processing unit 39 controls the reading device 3 generally. Specifically, the processing unit 39 is an example of a “processing unit” and executes voltage calculation processing to calculate the voltage V1 of the detection target conductor unit 15 based on the voltage data Dv output from the voltmeter 36. Do. Further, the processing unit 39 executes information specifying processing for specifying a CAN frame (digital signal) transmitted via the serial bus SB based on the voltage V1 calculated in the voltage calculation processing. In addition, the processing unit 39 displays various information selected by the user on the display unit 38 based on the CAN frame specified by the information specifying process.

  Next, a method for reading a CAN frame transmitted between the nodes N via the serial bus SB by the reading system 100 will be described with reference to the accompanying drawings. As described above, it is assumed that the connector 1 is already connected to the serial bus SB, and the conductors for detection 15 of the connector 1 are connected to the conductors Lwa of the signal cable Ca. .

  First, as an example, the other end portion of the connection cable Cb in which the connector 2 to which each detection conductor portion 25 is connected to each conductor LWb is arranged at one end portion is connected to the reading device 3 (voltage detection portion 33). Do. Next, as shown in FIGS. 1 and 2, the connector 2 is connected to the connector 1.

  At this time, as shown in FIG. 3, each insertion portion 28 of the connector 2 is inserted into each insertion portion 18 of the connector 1, so that each electrode 12 of the connector 1 is connected to each inner space 27 of the connector 2. It will be in the state inserted in each. As a result, the conductor portion for detection 15 of each electrode 12 and the conductor portion for detection 25 of each electrode 22 are positioned relative to each other, and the conductor portion for detection 25 of the electrode 22 is applied to the insulating coating 16 on the electrode 12 of the connector 1. It abuts, and the detection conductor portion 25 and the detection conductor portion 15 are capacitively coupled via the insulating coating 16.

  In this case, as described above, in the connector 1 of this example, the arrangement interval of the adjacent electrodes 12 and 12 and the arrangement direction of the adjacent electrodes 12 and 12 are different at a plurality of locations. Each electrode 12 (detected conductor portion 15) is held by the base 11. Further, in the connector 2 of this example, the arrangement interval of the adjacent electrodes 22 and 22 and the arrangement direction of the adjacent electrodes 22 and 22 correspond to the arrangement interval and the arrangement direction of the electrodes 12 in the connector 1. The electrodes 22 (detection conductor portions 25) are held by the base 21 so as to be in different states at a plurality of locations.

  Therefore, there is only one connection posture of the connector 2 with respect to the connector 1 (insertion mode of each electrode 22 with respect to each electrode 12), and the electrodes 12-1 to 12-n are in relation to the electrodes 22-1 to 22-n. Thus, it is impossible to connect the connector 2 to the connector 1 except for the inserted state. Thereby, the misconnection of each electrode 22 of the connector 2 with respect to each electrode 12 of the connector 1 is preferably avoided.

  Next, by operating the operation unit 37 in the reading device 3 of the reading system 100, reading of the CAN frame from the serial bus SB is started. In this case, the CAN frame (digital signal) transmitted through the serial bus SB is applied to the voltage applied to the conductor LWa corresponding to “CANH (CAN high)” (the potential of the conductor LWa corresponding to “SG”). Corresponding to “CANL” with respect to the fluctuation of the potential of the lead LW corresponding to “CANH” and the voltage applied to the lead LWa corresponding to “CANL (CAN low)” (the potential of the lead LW corresponding to “SG”) Transmission is performed by the “two-wire differential voltage method” based on the fluctuation of the potential of the conductor LWa). Since this CAN frame transmission method is publicly known, in order to facilitate understanding of the “bus side connector”, “device side connector”, and “reading system”, the voltage of the conductor LWa corresponding to “CANH” will be described below. The reading of the CAN frame will be described focusing on the following.

  In this case, with transmission of the CAN frame, the voltage V1 of the conductor portion 15 to be detected connected to the conductor LWa corresponding to “CANH” in the connector 1 (hereinafter also simply referred to as “conductor LWa”) and the voltage detection When the potential difference Vdi with respect to the voltage of the second reference potential G2 of the unit 33 (that is, the voltage of the voltage signal V4) is increasing (for example, when the potential difference Vdi is increasing due to the increase of the voltage V1). In the voltage detection unit 33 of the reading device 3, the amount of current signal I flowing from the connector 1 into the current-voltage conversion circuit 33a via the detection conductor unit 25 increases.

  At this time, the current-voltage conversion circuit 33a reduces the voltage value of the detection voltage signal V2 being output. As a result, in the integration circuit 33b, the current flowing from the output terminal of the second operational amplifier toward the inverting input terminal via the capacitor increases due to the decrease in the detection voltage signal V2. Therefore, the integration circuit 33b increases the voltage of the integration signal V3. Also, with the voltage rise of the integral signal V3, the transistor of the drive circuit 33c shifts to the deep on state. As a result, in the insulating circuit 33 d (photocoupler), the current flowing through the light emitting diode is increased, and the resistance of the phototransistor is reduced. Accordingly, the voltage value of the integrated signal V3a generated by dividing the potential difference (Vdd−Vss) between the resistance value of the resistor 34 and the resistance value of the phototransistor decreases.

  In the reading device 3, the voltage generation unit 35 increases the voltage value of the voltage signal V4 being generated based on the integration signal V3a. As described above, in the reading system 100, the current-voltage conversion circuit 33a, the integration circuit 33b, the drive circuit 33c, the insulation circuit 33d, and the voltage generation unit 35 constituting the feedback loop are increased in the voltage V1 of the conductor portion 15 to be detected. Is detected, and a feedback control operation for increasing the voltage value of the voltage signal V4 is performed, thereby causing the voltage (voltage of the voltage signal V4) such as the second reference potential G2 of the voltage detection unit 33 to follow the voltage V1.

  Further, when the potential difference Vdi increases due to the decrease in the voltage V1, the amount of the current signal I flowing out (outflowing) from the current-voltage conversion circuit 33a to the connector 1 through the detection conductor portion 25 increases. At this time, the current-voltage conversion circuit 33a and the like forming the feedback loop execute feedback control operation in the reverse operation to the above-described feedback control operation to lower the voltage of the voltage signal V4, thereby detecting the voltage. The voltage (voltage of the voltage signal V4) such as the second reference potential G2 of the unit 33 is made to follow the voltage V1.

  Thus, in this reading system 100, the feedback control operation for causing the voltage (voltage of the voltage signal V4) such as the second reference potential G2 of the voltage detection unit 33 to follow the voltage V1 is executed in a short time, and the voltage detection unit A voltage such as the second reference potential G2 of 33 (which is also the voltage of the detection conductor 25 due to the virtual short circuit of the first operational amplifier of the current-voltage conversion circuit 33a) is made to coincide with (converge) the voltage V1. The voltmeter 36 measures the voltage value of the voltage signal V4 in real time and outputs voltage data Dv indicating the voltage value. In addition, after the voltage signal V4 once converges to the voltage V1 of the conductor portion 15 to be detected, each component constituting the feedback loop operates as described above to follow the fluctuation of the voltage V1.

  Therefore, when the voltage V1 of the conductor portion 15 to be detected changes sequentially with transmission of the CAN frame, voltage data Dv indicating the value of the changed voltage V1 is sequentially output from the voltmeter 36. In response to this, processing unit 39 stores voltage data Dv sequentially output from voltmeter 36 in a storage unit (not shown) and executes a voltage calculation process to convert voltage V1 of detected conductor unit 15 into voltage data. It is calculated based on Dv and stored in the storage unit.

  In addition, the processing unit 39 performs information specification processing for specifying a CAN frame (digital signal) transmitted through the serial bus SB based on the stored voltage value (the value of the voltage V1 calculated by the voltage calculation processing). Run.

  Specifically, the voltage V1 of the conductor part 15 to be detected connected to the conductor LWa corresponding to “CANH” exceeds a predetermined voltage level and connected to the conductor LWa corresponding to “CANL”. When the voltage V1 of the detected conductor part 15 to be detected is lower than a predetermined voltage level, it is determined that “1” of the digital signal is transmitted. In addition, the voltage V1 of the conductor portion 15 to be detected connected to the lead wire LWa corresponding to “CANH” is equal to or lower than a predetermined voltage level, and the lead wire to be detected connected to the lead wire LWa corresponding to “CANL”. When the voltage V1 of the conductor portion 15 is equal to or higher than a predetermined voltage level, it is determined that “0” of the digital signal is transmitted.

  As described above, the serial bus SB to which the connector 1 is connected is determined by sequentially determining which of the digital signals “0” and “1” is transmitted based on the voltage V1 of the detection subject conductor portion 15. Identify the CAN frame being transmitted via Further, the processing unit 39 stores the specified CAN frame in the storage unit, and displays the contents (information indicated by the CAN frame) on the display unit 38. Thus, the reading of the CAN frame from the serial bus SB by the reading system 100 (reading device 3) is completed.

  On the other hand, when the above series of processing is completed and it is no longer necessary to read the CAN frame from the serial bus SB, the connector 1 is removed from the connector 1 as shown in FIG.

  In this case, as described above, in the electrode 12 of the connector 1 of the present embodiment, the conductor portion 15 to be detected connected to the conductors Lwa constituting the serial bus SB is covered with the insulating coating 16. For this reason, even if the connector 2 is removed from the connector 1 and the electrode 12 is exposed, an electrical signal can be taken out by directly contacting the detected conductor portion 15 of each electrode 12 or detected. It is no longer possible to input an electrical signal in direct contact with the conductor portion 15 for use.

  Accordingly, even when the arrangement positions of the respective electrodes 12 in the connector 1 are determined by the standard and become publicly known, the CAN frame is transmitted to the conductor LWa corresponding to “CANH” and the conductor LWa corresponding to “CANL”. It is difficult to read the electrical signal from the connector 1 and it is difficult to input the electrical signal from the connector 1 to the conductor LWa corresponding to “CANH” or the conductor LWa corresponding to “CANL”. ing.

  Moreover, in order to read the CAN frame from the connector 1, as in the reading system 100 described above, the connector 2 which can be connected to the connector 1, and the conductor LWa and the detection conductor portion 15 via the connector 2 do not contact Thus, the reading device 3 capable of acquiring an electrical signal (voltage signal) is required. Therefore, it is possible to preferably avoid the situation where an unexpected external device (a device not having the same function as the connector 2 and the reader 3) is connected to the connector 1 connected to the serial bus SB. . As a result, a situation in which noise is mixed from the connector 1 into the serial bus SB is also suitably avoided.

  Furthermore, as described above, in the connector 1 of this example, the electrode 22 is disposed in the inserted portion 18 (the partition wall 17). Thereby, in the connector 1 of this example, the electrode 12 is protected by the partition wall 17 even in the state where the connector 2 is removed, and a situation where an external force is applied to the electrode 12 to be damaged is avoided. Further, as described above, in the connector 2 of the present example, the detection conductor portion 25 is disposed in the insertion portion 28 that can be inserted into the inserted portion 18 (the partition wall 17). Thereby, in the connector 2 of the present embodiment, the detection conductor portion 25 is disposed from the electrode 12 (the detection target conductor portion 15) of the connector 1 which is difficult to take out the electrical signal by being disposed in the insertion portion 18. It is possible to preferably take out an electrical signal via

  Further, in the connector 1 of this example, since the conductor portion 15 to be detected is covered with the insulating coating 16, even if moisture such as rainwater adheres to the connector 1, the moisture is detected. Direct contact with 15 is avoided. Therefore, a situation in which a short circuit accident between the conductor LWa to which any one of the conductors for detection 15 is connected and the conductor LWa to which any other conductor for detection 15 is connected is preferably avoided. The

  Thus, in this connector 1, the conductor portion 15 to be detected that is electrically connected to the lead wire LWa by being brought into direct contact with the lead wire LWa in the CAN communication serial bus SB is covered with the insulating coating 16. , And when the connector 2 is connected to the connector 1, the detection conductor portion 15 can be capacitively coupled to the detection conductor portion 25 of the connector 2 through the insulating coating 16. Is held by the base 11. Further, in this connector 2, a detection conductor which can be capacitively coupled to the detection conductor portion 15 through the insulating coating 16 covering the detection conductor portion 15 of the electrode 12 when connected to the connector 1 An electrode 22 having a portion 25 is held by the base 21.

  Therefore, according to the connectors 1 and 2, the conductor for detection 15 of the connector 1 connected to the conductor LWa of the signal cable Ca in the serial bus SB is covered with the insulating coating 16, so that the conductor for detection Since the electrical signal (CAN frame) cannot be read by bringing the connection terminal into direct contact with the unit 15, the situation where the CAN frame transmitted via the serial bus SB is abused can be preferably avoided. Also, since the connection terminal is brought into direct contact with the conductor portion 15 to be detected and an electric signal (CAN frame) can not be input or noise can not be mixed in from the conductor portion 15 to be detected, transmission is It is possible to preferably avoid the situation in which the transmission of the normal CAN frame to be interrupted is interrupted. Further, by connecting the connector 2 to the connector 1 which can not directly contact the connection terminal with the conductor portion 15 to be detected, the electric signal corresponding to the CAN frame is normal from the connector 1 through the connector 2 Therefore, the CAN frame can be read reliably and easily from the serial bus SB to the authorized user of the serial bus SB.

  Further, in the connector 1, the electrode 12 is disposed inside the inserted portion 18 (partition wall 17) provided in the base portion 11. Further, in the connector 2, the base portion 21 is provided with the insertion portion 28 which can be inserted into the insertion portion 18 so that the electrode 12 can be connected to the connector 1 disposed inside the insertion portion 18 (partition wall 17). . Therefore, according to the connectors 1 and 2, since the electrode 12 of the connector 1 is protected by the inserted portion 18 (partition wall 17) in the state where the connector 2 is not connected, breakage of the electrode 12 can be suitably avoided. By attaching the connector 2 to such a connector 1, the detection conductor 25 of the electrode 22 can be capacitively coupled to the detection conductor 15 of the electrode 12. Thus, the CAN frame can be read reliably and easily from the serial bus SB.

  Furthermore, in this connector 1, each electrode 12 is in such a state that at least one (in this example, both) of the arrangement interval and the arrangement direction of the adjacent electrodes 12 are different in at least one place (a plurality of places in this example) It is held by the base 11. Further, in the connector 2, the arrangement interval and the arrangement direction of the adjacent electrodes 22 are defined according to the arrangement interval and the arrangement direction of the electrodes 12 in the connector 1, and the electrodes 22 are held by the base 21. Therefore, according to the connectors 1 and 2, the connection mode of the connector 2 (each electrode 22) with respect to the connector 1 (each electrode 12) can be limited in one way, so that the occurrence of erroneous connection is suitably avoided. Can do.

  In addition, the reading system 100 includes the connector 2 and the reading device 3, and the reading device 3 detects the voltage V 1 of the conductor portion 15 to be detected connected to the conducting wire LWa of the serial bus SB at the electrode 22. A voltage detection unit 33 that outputs a voltage signal (an integration signal V3a indicating the voltage V1) detected through the conductor unit 25 and changed according to the detected voltage V1, and a conductor unit to be detected based on the "voltage signal" Measure voltage V1 of detected conductor 15 based on voltage generator 35 generating voltage (voltage signal V4) following voltage V1 of 15 and voltage (voltage signal V4) generated by voltage generator 35 And a processing unit 39 for specifying a CAN frame transmitted via the serial bus SB based on a change in voltage (value of voltage data Dv) measured by the voltmeter 36. That.

  Therefore, according to this reading system 100, from the connector 1 in which the connection terminal can not be brought into direct contact with the detected conductor portion 15 connected to the conductor LWa of the serial bus SB, the detected conductor portion 15 and An electrical signal corresponding to the CAN frame can be reliably read through capacitive coupling with the detection conductor 25.

  The configurations of the “bus side connector”, the “device side connector”, and the “reading system” are not limited to the examples of the configurations of the connectors 1 and 2 and the reading system 100 described above. For example, regarding the electrode 22 of the connector 2, the configuration in which the detection conductor 25 is in direct contact with the electrode 12 of the connector 1 (the insulation coating 16 of the electrode 12) when connecting to the connector 1 has been described. Instead of such a configuration, it is also possible to adopt a configuration in which the "device side conductor portion" is covered with the "insulation coating" in the same manner as the "bus side conductor portion".

  Specifically, the connector 2A shown in FIG. 8 is another example of the "apparatus side connector", and the cylindrical detection conductor portion 25a which is another example of the "bus side conductor portion" has the insulation coating 26a. (The other example of the “device-side electrode”: hereinafter, when not distinguished, it is also referred to as “the electrode 22 a”). In this case, in the connector 2A, the base 21a corresponds to the "apparatus side base". In the same figure and FIGS. 9 and 10 to be referred to later, the same components as those in the above-described example described with reference to FIGS.

  In the connector 2A, when the insertion portion 28a (another example of the "insertion portion") is inserted into the insertion portion 18 of the connector 1 at the time of connection to the connector 1, the electrode 12 of the connector 1 is the inner space of the electrode 22a. 27a is inserted. In this state, the detection conductor portion 15 of the electrode 12 in the connector 1 and the detection conductor portion 25a of the electrode 22a in the connector 2A are capacitively coupled via the insulation coating 16 of the electrode 12 and the insulation coating 26a of the electrode 22a. . Therefore, similarly to the combination of the connectors 1 and 2 described above, the CAN frame transmitted through the serial bus SB (conductor LWa) is preferably detected without contact with the conductor LWa or the conductor 15 to be detected. can do.

  Also, the connector 1 in which the cylindrical detection conductor portion 15 is covered with the insulation coating 16 is connected to the signal cable Ca (conductor LWa) as a "bus side connector", and the cylindrical detection conductor portion 25a is insulated. The example in which the connector 2 covered with the coating 26a is connected to the signal cable Cb (conductive wire LWb) as the “device-side connector” has been described, but the signal cable Ca (conductive wire LWa) is assumed to have the connector 2 as the “bus-side connector”. The connector 1 can also be used as a “device-side connector” by connecting to the signal cable Cb (conductor LWb). Furthermore, when the connector 1 is used as an "apparatus side connector", the insulating coating 16 covering the conductor portion 15 to be detected can be omitted and the conductor portion 15 to be detected can be exposed. (Not shown).

  Further, the inner cross-sectional shape of the partition wall 17, that is, the connector 1 in which the hole shape of the insertion portion 18 is formed in a circle, and the circular insertion portion 28 (insertion portion 28 a) having an outer diameter equal to the inner diameter of the insertion portion 18. The example in which the formed connector 2 (connector 2A) is used in combination has been described, but the partition wall 17b (inserted portion 18b: “tubular” in the connector 1B (another example of the “bus side connector”) shown in FIG. And the insertion portion 28b (a further example of the "insertion portion") in the connector 2B (further example of the "apparatus side connector"), the "tubular portion" and the "insertion portion" The shape of may be any shape other than a circle (a perfect circle).

  In this case, the insertion portion 18b (partition wall 17b) in the connector 1B is formed to have a substantially rectangular inner cross-sectional shape (an example of "a predetermined shape other than a non-circular shape"), and the insertion portion 28b in the connector 2B is The outer shape is formed in a substantially rectangular shape complementary to the inserted portion 18 b and is formed insertable into the inserted portion 18 b.

  In the connector 1B, the base portion 11b corresponds to the “bus side base portion”, the electrode 12b corresponds to the “bus side electrode”, the detected conductor portion 15b corresponds to the “bus side conductor portion”, and The insulating coating 16 b corresponds to the “insulating coating”. In the connector 2B, the base 21b corresponds to the “device side base”, the electrode 22b corresponds to the “device side electrode”, and the detection conductor 25b corresponds to the “device side conductor”. The conductor portion 25 b and the insulating coating 26 b constitute an insertion portion 28 b. Further, in the connector 2B, the inner space 27b of the electrode 22b (detection conductor portion 25b) is formed in a shape complementary to the electrode 12b in the connector 1B.

  As described above, in the connector 1B, the insertion portion 18b (partition wall 17b) is formed so that the inner cross-sectional shape is a predetermined shape (in this example, substantially rectangular) having a non-circular shape. Further, in the connector 2B, the insertion portion 28b is formed so as to be insertable into the insertion portion 18b (the partition wall 17b) formed in the non-round-shaped predetermined shape. Therefore, according to the connector 1B and the connector 2B, the insertion manner of each insertion portion 28 with respect to each inserted portion 18b, that is, the connection manner of the connector 2B (each electrode 22b) with respect to the connector 1B (each electrode 12b) is taken together. Since the limitation can be made, occurrence of erroneous connection can be suitably avoided.

  Note that the “non-circular predetermined shape” of the “cylindrical portion” or “insertion portion” is not limited to a substantially rectangular shape (rectangular shape) as in the example of the configuration of the connectors 1B and 2B. It can have any shape, such as a polygon with five or more corners, a star, a cross and an ellipse (not shown).

  In addition, the shapes of the “bus-side conductor portion” that configures the “bus-side electrode” and the “device-side conductor portion” that configures the “device-side electrode” are not limited to a columnar or tubular shape (that is, a rod shape). Specifically, as shown in FIG. 10 (connector 1C (another example of "bus side connector") and connector 2C (other example of "apparatus side connector"), "bus side conductor portion" and Either or both of the "device-side conductor portions" may be plate-shaped.

  In this case, in the connector 1 </ b> C, the disc-shaped conductor portion 15 c to be detected corresponding to the “bus side conductor portion” is held by the base portion 11 c in a state covered with the insulating coating 16 c (another example of “insulating coating”). Thus, an electrode 12c corresponding to the "bus side electrode" is formed. In the connector 1C, the base 11c corresponds to the "bus side base", and the inserted portion 18c (the partition wall 17c) corresponds to the "cylindrical portion". Further, in the connector 2C, a disc-shaped detection conductor portion 25c corresponding to the “device-side conductor portion” is held by the base portion 21c in a state of being disposed in the inner space 27c of the partition wall 26c, and “device-side electrode” An electrode 22c corresponding to In the connector 2C, the base 21c corresponds to the "apparatus side base", and the insertion portion 28c corresponds to the "insertion portion". Even when such a configuration is adopted, the CAN frame transmitted via the serial bus SB (conductive wire LWa) is converted into the conductive wire LWa or the conductor portion to be detected in the same manner as the combination of the connectors 1 and 2 described above. 15c can be detected preferably without contact.

  In addition, although the configuration in which both the “arrangement interval” of each of the conductor portions 15 for detection and the “arrangement direction” of each conductor portion 15 for detection are different at a plurality of locations has been described as an example The "bus side connector" can also be configured by changing only one of the "arrangement interval" of the electrodes and the "arrangement direction" of the "bus side electrodes" in at least one place (not shown). Even when such a configuration is adopted, the same effect as that of the connector 1 described above can be obtained. In addition, although the configuration in which both the “arrangement interval” of each detection conductor 25 and the “arrangement direction” of each detection conductor 25 are different at a plurality of locations has been described as an example, “device side electrode” At least one of “arrangement interval” and “arrangement direction” of “device side electrode” may be different in at least one place in the same manner as “bus side connector” to form “device side connector”. Yes (not shown). Even when such a configuration is adopted, the same effect as that of the connector 2 described above can be obtained.

  Furthermore, an example of using the connectors 1, 2 and the like when connecting the reading system 100 (reading device 3) as an external device to the serial bus SB has been described, but among the nodes N connected to the serial bus SB, If the CAN frame does not need to be input to the serial bus SB (only the CAN frame is read), the same function as that of the reader 3 described above is provided, and the same connectors as those of 1, 2 etc. Can be connected to the serial bus SB.

  In addition, although the form used in the serial bus SB configuring the in-vehicle network has been described as an example, “CAN communication in various fields other than the vehicle (fields such as a network for facilities in a plant, a network in cultivated land, etc.) In "serial bus", "bus side connector", "device side connector" and "read system" can be used. In addition to reading CAN frames from the “serial bus”, the “bus” is used for reading frames (digital data) in accordance with various communication standards such as “CAN FD”, “FlexRay (registered trademark)” and “LIN”. The side connector ", the" device side connector "and the" reading system "can be configured to be usable.

DESCRIPTION OF SYMBOLS 100 Reading system 1, 1B, 1C, 2, 2A-2C Connector 3 Reader 11, 11b, 11c, 21, 21a-21c Base 12-1-12-n, 12b, 12c, 22-1-22-n, 22a-1 to 22a-2 ······ 22b 22c Electrodes 15, 15b, 15c Conductors for detection 16, 16b, 16c, 26, 26a, 26b Insulating coatings 17, 17b, 17c, 26c Partitions 18, 18b, 18c Inserted parts 25, 25b, 25c Conducting conductor parts for detection 27, 27a to 27c Inside space 28, 28a to 28c Insertion part 31 Main power supply circuit 32 Converter 33 Voltage detection part 34 Resistance 35 Voltage generation part 36 Voltmeter 37 Operation part 39 Processing Part C Capacitance Dv Voltage data LW1a to LWna, LW1b to LWnb Conductor Ca, Cb Signal cable N1 to Nn Node Pab, Pbc, Pde, Pef Arrangement interval Qgh, Qjk Dotted line Qhi, Qkl Dotted line SB Serial bus V1 voltage

Claims (9)

A device-side connector connected to a reader for reading a CAN frame transmitted via a serial bus for CAN communication from the serial bus can be electrically connected to the serial bus so that the bus can be connected to the serial bus Side connector,
The apparatus further comprises a bus side electrode in which a bus side conductor portion electrically connected to the lead wire by being brought into direct contact with the lead wire of the serial bus is covered with an insulating coating, and the bus side connector A bus in which the bus-side electrode is held by the bus-side base so that the bus-side conductor can be capacitively coupled to the device-side conductor of the device-side connector via the insulating coating when the side connector is connected Side connector.   The bus side connector according to claim 1, wherein the bus side electrode is disposed inside a cylindrical portion provided in the bus side base.   3. The bus side connector according to claim 2, wherein the cylindrical portion is formed such that the inner cross sectional shape is a non-circular predetermined shape.   The respective bus-side electrodes are held by the bus-side base such that at least one of the arrangement interval and the arrangement direction of the adjacent bus-side electrodes including the plurality of bus-side electrodes is different in at least one place. The bus side connector according to any one of claims 1 to 3. A device-side connector configured to be connectable to a bus-side connector attached to a serial bus for CAN communication, and connected to a reader that reads a CAN frame transmitted via the serial bus from the serial bus And
It has a device side conductor portion that can be capacitively coupled to the bus side conductor portion via an insulating coating covering the bus side conductor portion of the bus side electrode of the bus side connector when connected to the bus side connector A device-side connector in which a device-side electrode is held by a device-side base.   The apparatus side according to claim 5, wherein the apparatus-side base is provided with an insertion portion which can be inserted into the cylindrical portion so that the bus-side electrode can be connected to the bus-side connector disposed inside the cylindrical portion. connector.   7. The device-side connector according to claim 6, wherein the insertion portion is formed so as to be insertable into the cylindrical portion which is formed in a non-round-shaped predetermined shape.   Each of the bus-side electrodes is held by the bus-side base such that at least one of the arrangement interval and the arrangement direction of the adjacent bus-side electrodes provided with the plurality of bus-side electrodes is different in at least one place. A plurality of the device-side electrodes connectable to the bus-side connector, and an arrangement interval and an arrangement direction of the adjacent device-side electrodes are defined according to the arrangement interval and the arrangement direction of the respective bus-side electrodes The device side connector according to any one of claims 5 to 7, wherein the respective device side electrodes are held by the device side base. A device-side connector according to any one of claims 5 to 8 and the reader.
The reader is
Voltage detection of detecting a voltage of the bus-side conductor connected to the conductor of the serial bus via the device-side conductor at the device-side electrode and outputting a voltage signal that changes according to the detected voltage And
A voltage generator that generates a voltage that follows the voltage of the bus-side conductor based on the voltage signal;
A measurement unit that measures the voltage of the bus-side conductor based on the voltage generated by the voltage generation unit;
And a processor configured to specify the CAN frame transmitted via the serial bus based on the change in the voltage measured by the measurement unit.

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