CN101404001A - Serial port signal and USB signal compatible control circuit board and communication data cable - Google Patents

Abstract

The control circuit board and communication data cable compatible with serial port signals and USB signals belong to the field of communication technology. The serial interface end of the cable serial plug, and the USB interface end used to connect the USB plug of the cable, and the control circuit board selects serial port communication or USB communication according to the control signal. The advantage of the present invention is that it can not only connect terminals using serial port signals for data transmission, but also connect other terminals using USB signals for data transmission, and it is no longer necessary to replace matching cables according to different types of port signals, greatly improving Production line efficiency.

Description

Control circuit board and communication data cable compatible with serial port signal and USB signal

technical field

The invention relates to the technical field of communication, in particular to a control circuit board and a communication data cable capable of being compatible with serial port signals and USB signals.

Background technique

As we all know, the communication ports used for production and testing of traditional wireless terminal products such as mobile phones and data cards are usually serial ports. Later, due to the emergence of USB, a high-communication rate interface, more and more wireless terminal products also use this interface. In this way, when the product is produced, some product ports still use the serial port for communication, while some product ports need to use the USB port for communication, which makes it necessary to replace the corresponding communication port according to the different communication ports of the product data cable. The serial communication data cable and the USB communication data cable are two communication cables with completely different signal sending and receiving methods and standards, because the serial data cable generally only uses three signal pins for communication, which are TX, RX and GND need to be level-shifted when used. For example, the two signals TX and RX of the serial port are usually level-shifted to complete the communication with the wireless terminal product. However, the USB communication cable has four signal pins, which are VCC, D+, D-, and GND. There is no need to do level conversion for communication with USB, and it can be directly connected, but because the USB signal rate is much higher than the serial port signal rate , in order to ensure normal communication, generally speaking, the USB cable needs to be shielded.

Therefore, these two kinds of communication data cables have the following problems in the use of the prior art: first, when producing, testing or developing and debugging wireless terminal products with various communication ports, it is necessary to select or replace the corresponding cable according to whether the product port is a serial port or a USB interface. communication cables. Secondly, when producing new wireless terminal products on a large scale, once the new product port does not match the communication data cable used for testing on the original production line, it may be necessary to replace the matching communication cable on a large scale in the entire production line. Product production brings a lot of inconvenience. Finally, if the production line is equipped with two standard communication data cables, the cost will be increased, the work efficiency will be low, and the use will not be very convenient.

Contents of the invention

The purpose of the embodiments of the present invention is to provide a control circuit board and a communication data cable compatible with serial port signals and USB signals. The control circuit board can be set in the communication data cable for selecting serial port communication or USB communication , so that the cable can not only be connected to a terminal using serial port signals for data transmission, but also be connected to other terminals using USB signals for data transmission.

In order to achieve the purpose of the above invention, an embodiment of the present invention provides a control circuit board compatible with serial port signals and USB signals, and the control circuit board includes:

A common interface port for connecting a serial port and a USB common plug, and the serial port and USB common plug are used for connecting with a matching port on the wireless communication terminal;

A serial interface port for connecting a serial plug, the serial plug is used for connecting with a matching serial port on an external device to realize serial signal transmission with a wireless communication terminal; and

It is used to connect the USB interface end of the USB plug, and the USB plug is used to connect with the matching USB port on the external device to realize the USB signal transmission with the wireless communication terminal,

The control circuit board selects serial port communication or USB communication according to the control signal.

The present invention also provides a communication data cable, one end of the data cable is a common plug for the serial port and USB, and the other end of the data cable branches out to a serial plug through a control circuit board compatible with serial port signals and USB signals and a USB plug, the serial port and the USB common plug are used to connect with the matching port on the wireless communication terminal, the serial plug is used to connect with the matching serial port on the external device, and the USB plug is used to connect with the matching port on the wireless communication terminal A matching USB port connection on the external device.

The embodiment of the present invention has the following beneficial effects: the control circuit board of the present invention is connected with a corresponding plug to form a communication data cable, so that the communication data cable can be connected to a terminal using a serial port signal for data transmission, It can also be connected to other terminals that use USB signals for data transmission. It is no longer necessary to replace the matching cables according to the different types of port signals. It is especially convenient to use on the production line, which greatly improves the work efficiency of the production line. Moreover, shielding treatment is done on the cable to better ensure the stability of the USB communication signal.

Description of drawings

Fig. 1 is a schematic block diagram of the electrical connection relationship between a control circuit board and a communication data cable plug according to an embodiment of the present invention.

Fig. 2 is a circuit diagram of the control circuit board of the second embodiment of the invention.

Fig. 3 is a circuit diagram of the control circuit board of the third embodiment of the invention.

Fig. 4 is a circuit diagram of the control circuit board of the fourth embodiment of the invention.

Fig. 5 is a schematic structural block diagram of the connection relationship between the control circuit board and the plug according to the embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings.

The embodiment of the present invention is a control circuit board and a communication data cable compatible with serial port signals and USB signals. The communication data cable composed of the control circuit board, the cable and the corresponding plug is connected to realize wireless terminals and terminals such as PCs. Device connection.

Fig. 1 is a control circuit board compatible with serial port signals and USB signals according to Embodiment 1 of the present invention. The control circuit board 2 includes: a common interface port 21 for connecting the serial port and the USB common plug 1, and the serial port and the USB common plug 1 is used to connect with the matching port on the wireless communication terminal; it is used to connect the serial interface port 23 of the serial plug 3, and the serial plug 3 is used to connect with the matching serial port on the external device to realize the connection with the wireless The serial signal transmission of the communication terminal; and the USB interface port 24 for connecting the USB plug 4, the USB plug 4 is used for connecting with the matching USB port on the external device to realize the USB signal transmission with the wireless communication terminal.

Wherein, the control circuit board 2 selects serial port communication or USB communication according to the control signal. For example, when the port of the wireless communication product uses a USB signal, the common interface end 21 of the control circuit board 2 is connected to the USB port on the wireless communication product through the common plug 1 connected by the communication cable, and the control signal input after connection is a high-level signal , so that the control circuit board 2 selects USB communication, so that the wireless terminal communicates with the PC on the production line.

When the port of the wireless communication product uses a serial port signal, the common interface end 21 of the control circuit board 2 is connected to the serial port on the wireless communication product through the common plug 1 connected by the communication cable, and the control signal input is a low-level signal after connection , so that the control circuit board 2 selects the serial port communication, so that the wireless terminal communicates with the PC on the production line.

In this way, the control circuit board 2 is connected to a corresponding plug to form a communication data cable, so that the communication data cable can be connected to a terminal using serial port signals for data transmission, and can be connected to other terminals using USB signals for data transmission. For data transmission, it is no longer necessary to replace the matching cables according to the different types of port signals, which is very convenient to use.

Fig. 2 is the control circuit board compatible serial port signal and USB signal of embodiment two of the present invention, as shown in Fig. 2, described control circuit board 2 comprises: common interface end 21, is used for connecting serial port and USB common plug 1, so The serial port and USB common plug 1 are used to connect with the matching port on the wireless communication terminal; the serial interface end 23 is used to connect the serial plug 3, and the serial plug 3 is used to match with the external device. Serial port connection, realizing serial signal transmission with wireless communication terminal; USB interface end 24, is used for connecting USB plug 4, and described USB plug 4 is used for connecting with the matching USB port on the external device, realizes connecting with wireless communication terminal USB signal transmission.

The common interface port 21 of the control circuit board consists of a power supply pin VBUS, a pin TX/D+ for sending data, a pin RX/D- for receiving data, and a pin for inputting high and low level signals to control all The first and second switches on the control circuit board 2 are composed of the control signal pin CTRL for selecting whether to connect to the serial port or to connect to the USB port.

The serial port 23 is composed of a pin PC_TX for sending data and a pin PC_RX for receiving data.

The USB port 24 is composed of a power supply pin PC_VBUS, a pin PC_D+ for sending data, and a pin PC_D− for receiving data.

The power supply pin VBUS is connected with the power supply pin PC_VBUS on the USB interface port 24 on the control circuit board 2, and is used to provide the USB port power supply of the wireless communication terminal product connected with the common plug 1; The pins TX/D+ and RX/D- used for sending and receiving data are pins shared by serial port signals and USB signals, which are respectively electrically connected to the first switch 25 and the second switch 26 on the control circuit board, so The first switch 25 and the second switch 26 are respectively provided with a first contact and a second contact that can be electrically connected to the two switches, and the first contact 251 of the first switch passes through the control circuit board 2. The RS232 level shifting circuit 28 is connected to the sending data pin PC_TX on the serial interface port 23 on the control circuit board 2, and the second contact 262 of the second switch communicates with the serial port 28 through the RS232 level shifting circuit 28. The receiving data pin PC_RX on the row interface end 23 is connected, the second contact 252 of the first switch is connected to the sending data pin PC_D+ on the USB interface end 24, and the first contact 261 of the second switch is connected to the USB interface The receiving data pin PC_D- on the end 24 is connected, that is, the other end of the two switches can be selectively connected to the first contact 251 of the first switch and the second contact 262 of the second switch, or to the second contact 262 of the second switch. The second contact 252 of the first switch is connected to the first contact 261 of the second switch, thereby forming a single pole double throw switch. The first switch 25 , the second switch 26 and the RS232 level conversion circuit 28 on the control circuit board 2 all need to be grounded, and all need to be powered by the power pin PC_VBUS on the USB interface. The control signal pin CTRL used to judge the high and low level signals to control the first and second switches to select the serial port connection or the USB connection is connected to the power pin PC_VBUS on the USB interface port 24 through the resistor R, and the first Both the first switch 25 and the second switch 26 are connected to the control signal pin CTRL through the first node 27 , and the first node 27 is set between the control signal pin CTRL and the resistor R.

In this embodiment, the USB interface port 24 of the control circuit board 2 is always connected to the USB port of the PC through the USB plug 4, and the PC_VBUS in the USB interface signal supplies power for the entire circuit, the voltage is 5V, and the current is 500mA. The RS232 used in this embodiment is a typical level conversion circuit. The SPDT switch used in this embodiment is a high-speed analog switch, which is controlled by high and low level signals. In this embodiment, the control signal CTRL is provided from the outside, and the serial port communication or the USB port communication is selected through high and low level control. Assuming that USB signal communication is selected at high level, it is serial signal communication at low level.

The working principle of the control panel of this embodiment will be described in detail below.

In the case that the port of the wireless communication product is a USB port, when testing or developing and debugging the product, it is necessary to connect the port of the wireless communication product to the common plug 1, and set the CTRL to be suspended or disconnected. At this time, the CTRL control The signal is a high level signal. When the CTRL control signal reaches the first switch 25 and the second switch 26 through the first node 27 , the first switch connects the path of the second contact 252 , and the second switch connects the path of the first contact 261 . Thus, the path from the common interface port 21 to the USB interface port 24 is connected to realize USB communication.

In the case that the port of the wireless communication product is a serial port, when testing or developing and debugging the product, it is necessary to connect the port of the wireless communication product to the common plug 1, and ground CTRL. At this time, the CTRL control signal is a low-level signal. And connect the serial plug 3 (eg DB9 plug) connected to the serial interface port 23 of the control circuit board 2 with the serial port of the PC. When the CTRL control signal reaches the first switch 25 and the second switch 26 through the first node 27 , the first switch connects the path of the first contact 251 , while the second switch connects the path of the second contact 262 . Thus, the path from the common interface port 21 to the serial interface port 23 is connected to realize serial port communication.

Through the selection and switching of the single-pole double-throw switch by the external control signal, this embodiment can effectively select the communication mode with the wireless terminal through the control circuit board, so that it is no longer necessary to replace the matching cable according to the type of the port signal , which greatly improves the compatibility of the production line and is conducive to the normalization of production line cables. And because the control circuit board 2 can be designed very small, it can be arranged in the serial plug 3 (as shown in FIG. 5 ), which is more convenient to use. In particular, since the USB signal is a high-speed signal, in order to ensure the quality of the USB communication signal, the entire cable needs to be shielded according to the requirements of the USB cable, so the communication quality can be well guaranteed.

It should be noted that the common plug in this embodiment can be designed to match the port of the wireless communication terminal product. Various types and models of wireless communication terminal products can also be connected to the common plug of this embodiment through an adapter. The first switch first contact 251 and the second switch second contact 262 described in this embodiment can be understood as normally closed contacts in the sense of the art, the first switch second contact 252 and the second switch first contact The contact 261 can be understood as a normally open contact in the sense of the art.

Fig. 3 is the control circuit board compatible serial port signal and USB signal of embodiment 3 of the present invention, as shown in Fig. 3, described control circuit board 2 comprises: common interface end 21, is used for connecting serial port and USB common plug 1, so The serial port and USB common plug 1 are used to connect with the matching port on the wireless communication terminal; the serial interface end 23 is used to connect the serial plug 3, and the serial plug 3 is used to match with the external device. Serial port connection, realizing serial signal transmission with wireless communication terminal; USB interface end 24, is used for connecting USB plug 4, and described USB plug 4 is used for connecting with the matching USB port on the external device, realizes connecting with wireless communication terminal USB signal transmission.

The common interface port 21 of the control circuit board consists of a power supply pin VBUS, a pin TX/D+ for sending data, a pin RX/D- for receiving data, and a pin for inputting high and low level signals to control all The first and second switches on the control circuit board 2 are composed of the control signal pin CTRL for selecting whether to connect to the serial port or to connect to the USB port.

The serial interface port 23 consists of a pin PC_TX for sending data, a pin PC_RX for receiving data, a first pin for connecting the serial plug data terminal ready pin PC_DTR and a A second pin configuration for connecting the serial plug request-to-send pin PC_RTS.

The USB port 24 is composed of a power supply pin PC_VBUS, a pin PC_D+ for sending data, and a pin PC_D− for receiving data.

The power supply pin VBUS is connected with the power supply pin PC_VBUS on the USB interface port 24 on the control circuit board 2, and is used to provide the USB port power supply of the wireless communication terminal product connected with the common plug 1; The pins TX/D+ and RX/D- used for sending and receiving data are pins shared by serial port signals and USB signals, which are respectively electrically connected to the first switch 25 and the second switch 26 on the control circuit board, so The first switch 25 and the second switch 26 are respectively provided with a first contact and a second contact that can be electrically connected to the two switches, and the first contact 251 of the first switch passes through the control circuit board 2 The low power consumption RS232 level conversion circuit 28 on the serial port 23 is connected to the sending data pin PC_TX on the serial interface port 23, and the second contact 262 of the second switch is connected to the low power consumption RS232 level conversion circuit 28 through the The receiving data pin PC_RX on the serial interface port 23 is connected, the second contact 252 of the first switch is connected to the sending data pin PC_D+ on the USB interface port 24, the first contact 261 of the second switch is connected to the The receiving data pin PC_D- on the USB interface port 24 is connected, that is, the other ends of the two switches can be selectively connected to the first contact 251 of the first switch and the second contact 262 of the second switch, or It is connected with the second contact 252 of the first switch and the first contact 261 of the second switch, thereby forming a single pole double throw switch in a high-speed analog switch. The first switch 25 , the second switch 26 and the low-power RS232 level conversion circuit 28 on the control circuit board 2 all need to be grounded, and all need to be powered by the power pin PC_VBUS on the USB interface. The control signal pin CTRL used to judge the high and low level signals to control the first and second switches to select the serial port connection or the USB connection is connected to the power pin PC_VBUS on the USB interface port 24 through the resistor R, and the first Both the first switch 25 and the second switch 26 are connected to the control signal pin CTRL through the first node 27 , and the first node 27 is set between the control signal pin CTRL and the resistor R. The anode of the first diode 291 to prevent current backflow is connected to the power supply pin PC_VBUS on the USB interface port 24, and the anode of the second diode 292 is connected to the first connection of the serial interface port 23 on the control circuit board 2. Pin connection, the first pin is used to connect the data terminal ready pin of the serial plug 3, the anode of the third diode 293 is connected to the second pin of the serial interface terminal 23, the first pin The two pins are used to connect the request sending pin of the serial plug 3 , and the resistor R and the negative poles of the three diodes are grounded through a filter capacitor. In this embodiment, the serial interface port 23 and the USB interface port 24 on the control circuit board 2 can always be connected with the PC through the serial plug 3 and/or the USB plug 4, because the original idle signal data terminal ready DTR and request sending The pin RTS has been set to a high level, and the rectification of the diode connected to it can fully supply the required current in the circuit, that is, no matter whether the USB port on the control circuit board 2 is connected to the PC or not, the control circuit board will not be affected. 2 works fine.

Compared with the second embodiment, what is used in this embodiment is a low-power consumption RS232 typical level conversion circuit, because the current consumed by the low-power consumption RS232 level conversion circuit is smaller, when the USB port is not connected but only The operation of the control circuit board in this embodiment can be better ensured when the serial port DTR and RTS signals are used to rectify and supply power. And also use high-speed analog switches controlled by high and low level signals as single-pole double-throw switches. In addition, in this embodiment, the control signal CTRL is also provided from the outside, and the serial port communication or the USB port communication is selected through high and low level control. Assuming that USB signal communication is selected at high level, it is serial signal communication at low level.

The working principle of the control panel of this embodiment will be described in detail below.

In the case that the port of the wireless communication product is a USB port, when testing or developing and debugging the product, it is necessary to connect the port of the wireless communication product to the common plug 1, and set the CTRL to be suspended or disconnected. At this time, the CTRL control The signal is a high level signal. And the USB plug 4 connected with the USB interface end 24 of the control circuit board 2 is connected with the USB port of the PC. When the CTRL control signal reaches the first switch 25 and the second switch 26 through the first node 27 , the first switch connects the path of the second contact 252 , and the second switch connects the path of the first contact 261 . Thus, the path from the common interface port 21 to the USB interface port 24 is connected to realize USB communication.

In the case that the port of the wireless communication product is a serial port, when testing or developing and debugging the product, it is necessary to connect the port of the wireless communication product to the common plug 1, and ground CTRL. At this time, the CTRL control signal is a low-level signal. And connect the serial plug 3 (eg DB9 plug) connected to the serial interface port 23 of the control circuit board 2 with the serial port of the PC. When the CTRL control signal reaches the first switch 25 and the second switch 26 through the first node 27 , the first switch connects the path of the first contact 251 , while the second switch connects the path of the second contact 262 . Thus, the path from the common interface port 21 to the serial interface port 23 is connected to realize serial port communication.

Different from the second embodiment, since the idle signals DTR and RTS of the PC serial port can also supply power to the control circuit board 2 after simple processing, this embodiment can be used according to the wireless terminal connected to the common plug 1 Whether the port of the product is a serial port or a USB port, you can directly choose to connect the serial plug 3 to the serial port of the PC or connect the USB plug 4 to the USB port of the PC, instead of always connecting the USB plug 4 to the PC Connect to the USB port of the computer. Of course, before use, the serial plug 3 and the USB plug 4 can also be connected to the PC at the same time, so that the use is more convenient and flexible. Due to the functions of rectifying and preventing current backflow and the filtering function of capacitors, the whole control circuit can realize normal power supply through the low power consumption RS232 level conversion circuit.

Through the selection and switching of the single-pole double-throw switch by the external control signal, this embodiment can effectively select the communication mode with the wireless terminal through the control circuit board, so that it is no longer necessary to replace the matching cable according to the type of the port signal , which greatly improves the compatibility of the production line and is conducive to the normalization of production line cables. And because the control circuit board 2 can be designed very small, it can be arranged in the serial plug 3 (as shown in FIG. 5 ), which is more convenient to use. In particular, since the USB signal is a high-speed signal, in order to ensure the quality of the USB communication signal, the entire cable needs to be shielded according to the requirements of the USB cable, so the communication quality can be well guaranteed.

It should be noted that the common plug in this embodiment can be designed to match the port of the wireless communication terminal product. Various types and models of wireless communication terminal products can also be connected to the common plug of this embodiment through an adapter. The first switch first contact 251 and the second switch second contact 262 described in this embodiment can be understood as normally closed contacts in the sense of the art, the first switch second contact 252 and the second switch first contact The contact 261 can be understood as a normally open contact in the sense of the art.

Fig. 4 is a control circuit board compatible with serial port signals and USB signals according to Embodiment 4 of the present invention. As shown in Fig. 4 , the control circuit board 2 includes: a common interface port 21 for connecting the serial port and the USB common plug 1, so The serial port and USB common plug 1 are used to connect with the matching port on the wireless communication terminal; the serial interface end 23 is used to connect the serial plug 3, and the serial plug 3 is used to match with the external device. Serial port connection, realizing serial signal transmission with wireless communication terminal; USB interface end 24, is used for connecting USB plug 4, and described USB plug 4 is used for connecting with the matching USB port on the external device, realizes connecting with wireless communication terminal USB signal transmission.

The common interface 21 of the control circuit board is composed of a power supply pin VBUS, a pin TX/D+ for sending data, and a pin RX/D- for receiving data.

The serial interface port 23 is composed of a pin PC_TX for sending data, a pin PC_RX for receiving data, a first pin for connecting the data terminal ready pin PC_DTR of the serial plug and a second pin for connecting to the request sending pin PC_RTS of the serial plug;

The USB interface 24 is composed of a power supply pin PC_VBUS, a pin PC_D+ for sending data, and a pin PC_D- for receiving data;

The power supply pin VBUS is connected to the power supply pin PC_VBUS on the USB interface port 24, and is used to provide the USB port power supply on the wireless communication terminal product connected to the common plug 1; The pins TX/D+ and RX/D- for receiving data are pins shared by serial port signals and USB signals, which are respectively electrically connected to the first switch 25 and the second switch 26 on the control circuit board 2, and the The first switch 25 and the second switch 26 are respectively provided with a first contact and a second contact that can be electrically connected to the two switches, and the first contact 251 of the first switch passes through the RS232 on the control circuit board The level shifting circuit 28 is connected to the sending data pin PC_TX, the second contact 262 of the second switch is connected to the receiving data pin PC_RX through the RS232 level shifting circuit 28, and the second contact 252 of the first switch It is connected to the sending data pin PC_D+ on the USB interface end 24, and the first contact 261 of the second switch is connected to the receiving data pin PC_D- on the USB interface end 24, that is, the other ends of the two switches can be connected to each other. Optionally connected to the first contact 251 of the first switch and the second contact 262 of the second switch, or connected to the second contact 252 of the first switch and the first contact 261 of the second switch , thus forming a single-pole double-throw switch in a high-speed analog switch. The first pin or the second pin of the serial interface terminal 23 is electrically connected to the first switch 25 and the second switch 26 through the RS232 level conversion circuit 28, and a resistor R is placed in the RS232 level conversion circuit Between the circuit 28 and the power pin PC_VBUS of the USB port 24 . The first switch 25 , the second switch 26 and the RS232 level conversion circuit 28 on the control circuit board 2 all need to be grounded, and all need to be powered by the power pin PC_VBUS on the USB interface 24 .

Compared with the second and third embodiments, this embodiment uses the same RS232 typical level conversion circuit as the second embodiment, and also uses high-speed analog switches as SPDT switches, controlled by high and low level signals . However, different from the above-mentioned embodiments, this embodiment uses the idle signal DTR or RTS of the serial port to control the selection of serial port communication or USB port communication.

In this embodiment, the USB interface port 24 of the control circuit board 2 is always connected to the USB port of the PC through the USB plug 4, and the PC_VBUS in the USB interface signal supplies power for the entire circuit, the voltage is 5V, and the current is 500mA.

The working principle of the control panel of this embodiment will be described in detail below.

If the port of the wireless communication product is a USB port, the port of the wireless communication product needs to be connected to the common plug 1 when testing or developing and debugging the product. At this time, by controlling the serial port DTR or RTS of the PC to select USB communication as high-level control, the first switch is connected to the path of the second contact 252 , and the second switch is connected to the path of the first contact 261 . Thus, the path from the common interface port 21 to the USB interface port 24 is connected to realize USB communication.

In the case that the port of the wireless communication product is a serial port, when testing or developing and debugging the product, it is necessary to connect the port of the wireless communication product to the common plug 1, and to connect the port of the wireless communication product to the serial interface port 23 of the control circuit board 2 The serial plug 3 (eg DB9 plug) is connected with the serial port of the PC. The PC selects serial port communication for low-level control by controlling the serial port DTR or RTS. At this time, the first switch connects the path of the first contact 251 , and the second switch connects the path of the second contact 262 . Thus, the path from the common interface port 21 to the serial interface port 23 is connected to realize serial port communication.

Through the selection and switching of the single pole double throw switch by the control signal from the serial port of the PC, this embodiment can realize the software to control the selection of USB or serial port communication. Applying this embodiment can avoid the need to replace matching cables due to different port signal types, which greatly improves the compatibility of the production line and is beneficial to the normalization of production line cables. And because the control circuit board 2 can be designed very small, it can be arranged in the serial plug 3 (as shown in FIG. 5 ), which is more convenient to use. In particular, since the USB signal is a high-speed signal, in order to ensure the quality of the USB communication signal, the entire cable needs to be shielded according to the requirements of the USB cable, so the communication quality can be well guaranteed.

It should be noted that the common plug in this embodiment can be designed to match the port of the wireless communication terminal product. Various types and models of wireless communication terminal products can also be connected to the common plug of this embodiment through an adapter. The first switch first contact 251 and the second switch second contact 262 described in this embodiment can be understood as normally closed contacts in the sense of the art, the first switch second contact 252 and the second switch first contact The contact 261 can be understood as a normally open contact in the sense of the art.

Embodiment 5 of the present invention also provides a communication data cable, one end of the cable is a common plug 1 for a serial port and a USB, and the common plug 1 is used to connect to a port matched with a wireless communication terminal. The other end of the cable branches out a serial plug 3 and a USB plug 4 through a control circuit board 2 compatible with serial port signals and USB signals, and the serial plug 3 is used to connect with a matching serial port on an external device. The USB plug 4 is used to connect with the matching USB port on the external device. The control circuit board 2 compatible with serial port signals and USB signals can be any control circuit board in the above-mentioned embodiments, and its working principle has been described in detail above, and will not be repeated here.

The communication data cable of this embodiment can be pre-arranged on the production line of wireless terminal products for use during production testing or during research and development and debugging. By using the communication data cable of the present invention, the same cable can be compatible with serial port and USB port communication at the same time, and the communication port can be flexibly controlled and switched according to the actual usage without changing the cable. The use of this cable in the production line is not only compatible with serial port and USB communication methods, but also improves the compatibility of the production line, which is conducive to the normalization of production line cables. More importantly, it is not necessary to replace the communication cable when the production line changes products, which is convenient and flexible to use.

Although the real-time solution of the present invention has been described in conjunction with the accompanying drawings, it can be understood that the above-mentioned implementation is exemplary rather than restrictive, and those of ordinary skill in the art can do so without departing from the concept of the present invention. Various changes and/or modifications are made under the premise of the present application, and such changes and/or modifications should still be considered within the scope of the disclosure of this application.

Claims (12)

1, a kind of control circuit board compatible serial port signal and USB signal, it is characterized in that, described control circuit board (2) comprises: A common interface end (21) for connecting a serial port and a USB common plug (1), and the serial port and USB common plug (1) is used for connecting with a matching port on a wireless communication terminal; The serial interface end (23) that is used to connect serial plug (3), and described serial plug (3) is used for connecting with the serial port matching on the external device, realizes the serial signal transmission with wireless communication terminal; and A USB interface end (24) for connecting a USB plug (4), the USB plug (4) is used for connecting with a matching USB port on an external device to realize USB signal transmission with a wireless communication terminal, The control circuit board (2) selects serial port communication or USB communication according to the control signal. 2. The control circuit board compatible with serial port signals and USB signals according to claim 1, characterized in that, The common interface end (21) of the control circuit board is composed of a power supply pin, two pins for sending and receiving data and a pin for inputting high and low level signals to control the first pin on the control circuit board. It is composed of a control signal pin connected with the second switch to select whether the serial port is connected or the USB port is connected; The serial interface end (23) of the control circuit board is mainly composed of two pins respectively used for sending and receiving data; The USB interface end (24) of the control circuit board is composed of a power supply pin and two pins respectively used for sending and receiving data; The power pins of the shared interface (21) are connected to the power pins of the USB interface (24), and the two pins of the shared interface (21) are respectively used for sending and receiving data and The first switch (25) is electrically connected to the second switch (26), and the first contact (251) on the first switch (25) is connected to the serial interface port ( 23) is connected to the sending data pin, and the second contact (262) on the second switch (26) passes through the serial port level conversion circuit (28) and the receiving data of the serial interface end (23) Pin connection, the second contact (252) on the first switch (25) is connected to the sending data pin of the USB interface (24), the first contact on the second switch (26) The head (261) is connected with the receiving data pin of the USB interface end (24), and the first switch (25), the second switch (26), and the serial port level conversion circuit (28) are all connected to the USB interface. The power supply pin on the end (24) is connected; The control signal pin of the shared interface (21) is connected to the power supply pin of the USB interface (24) through a resistor, and the first node (27) is arranged between the control signal pin and the resistor , both the first switch (25) and the second switch (26) are connected to the control signal pin through the first node (27). 3. The control circuit board compatible with serial port signals and USB signals according to claim 2, characterized in that the serial port level conversion circuit (28) is an RS232 level conversion circuit. 4. The control circuit board compatible with serial port signals and USB signals according to claim 2, characterized in that, The serial interface end of the control circuit board also includes: a first pin, which is used to connect the data terminal ready pin of the serial plug; and a second pin, which is used to connect the request sending of the serial plug Pin; The control circuit board also includes three diodes and a capacitor, the anode of the first diode (291) is connected to the power supply pin of the USB interface end, and the anode of the second diode (292) is connected to the power pin of the serial interface end. The first pin is connected, the anode of the third diode (293) is connected to the second pin of the serial interface, and the negative poles of the three diodes are all connected to the ground through the capacitor. 5. The control circuit board compatible with serial port signals and USB signals according to claim 4, characterized in that, The serial port level conversion circuit (28) is an RS232 low power consumption level conversion circuit. 6. The control circuit board compatible with serial port signals and USB signals according to claim 1, characterized in that, The common interface end (21) of the control circuit board is composed of a power supply pin and two pins respectively used for sending and receiving data; The serial interface port (23) of the control circuit board consists of two pins respectively for sending and receiving data, a first pin for connecting the data terminal ready pin of the serial plug and a pin for connecting The second pin of the request to send pin of the serial plug is composed of; The USB interface end (24) of the control circuit board is composed of a power supply pin and two pins respectively used for sending and receiving data; The power pins of the shared interface (21) are connected to the power pins of the USB interface (24), and the two pins of the shared interface (21) are respectively used for sending and receiving data and The first switch (25) is electrically connected with the second switch (26), and the first contact (251) on the first switch (25) is connected to the serial interface port through the serial port level conversion circuit (28) (23) is connected to the sending data pin, and the second contact (262) on the second switch (26) is connected to the serial port (23) through the serial port level conversion circuit (28) The data pin is connected, the second contact (252) on the first switch (25) is connected to the sending data pin of the USB interface (24), the first contact (252) on the second switch (26) The contact (261) is connected to the receiving data pin of the USB interface (24), and the first pin or the second pin of the serial interface (23) passes through the serial port level conversion circuit (28 ) is electrically connected with the first switch (25) and the second switch (26), the first switch, the second switch, and the serial port level conversion circuit are all connected with the power supply pin of the USB interface end, and the resistor is placed in the Between the serial port level conversion circuit and the power pin of the USB interface. 7. The control circuit board compatible with serial port signals and USB signals according to claim 6, characterized in that the serial port level conversion circuit (28) is an RS232 level conversion circuit. 8. The control circuit board compatible with serial port signals and USB signals according to claim 1, 2, 4 or 6, characterized in that the control circuit board (2) communicates with the serial port through a shielded communication cable and USB common plug (1) connection. 9. The control circuit board compatible with serial port signals and USB signals according to claim 1, 2, 4 or 6, characterized in that the control circuit board (2) is arranged in the serial plug (3). 10. A communication data cable, characterized in that one end of the data cable is a common plug (1) for a serial port and a USB, and the other end of the data cable is passed through as claimed in claim 1, 2, 4 or 6. Said control circuit board (2) branches out a serial plug (3) and a USB plug (4), and said serial port and USB common plug (1) are used for connecting with the port matched on the wireless communication terminal, said The serial plug (3) is used for connecting with a matching serial port on the external device, and the USB plug (4) is used for connecting with a matching USB port on the external device. 11. The communication data cable according to claim 10, wherein the data cable is a shielded communication data cable. 12. The communication data cable according to claim 10, characterized in that, the control circuit board (2) is arranged in the serial plug (3).

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