CN105893287B - A kind of simplification telecommunication circuit suitable for MDB/ICP buses - Google Patents
A kind of simplification telecommunication circuit suitable for MDB/ICP buses Download PDFInfo
- Publication number
- CN105893287B CN105893287B CN201610488190.5A CN201610488190A CN105893287B CN 105893287 B CN105893287 B CN 105893287B CN 201610488190 A CN201610488190 A CN 201610488190A CN 105893287 B CN105893287 B CN 105893287B
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- mdb
- buses
- ttl
- triode
- icp
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Classifications
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/20—Handling requests for interconnection or transfer for access to input/output bus
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/36—Handling requests for interconnection or transfer for access to common bus or bus system
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention discloses a kind of simplification telecommunication circuits suitable for MDB/ICP buses, which is characterized in that provides the inverting level needed for MDB/ICP buses using a pair of single triode not circuit；The advantages of simplification telecommunication circuit suitable for MDB/ICP buses of the present invention is to be not only able to reduce the quantity of element, raising circuit reliability, cost-effective, while being also with good expansibility and adaptability.
Description
Technical field
The present invention relates to a kind of simplification telecommunication circuits suitable for MDB/ICP buses, belong to field of communication technology.
Background technology
The standard of MDB/ICP bus protocols (Multi-Drop Bus/Internal Communication Protocol)
Be first by Coinco Coca-Cola Co. specified lower exploitation.This standard was adopted in 1993 by NAMA associations
With；After special working group's revision, used by EVMMA in 1994.The non-cash transaction standard of second stage by
Debitek represents NAMA exploitations, and is used by NAMA in 1994；EVMMA add some compatibility instruction after in 1994
Using.MDB interfaces are actually to work in the master-slave type serial bus interfaces of 9600 baud rates, peripheral equipment used, such as
Coin-freed arrangement, paper money device, card reader are host (VCM) the i.e. slave of vending machine controller.All peripheral equipments and vending machine control
Communication mode between device processed is all consistent.MDB is MDB/ICP agreements (Multi-Drop Bus/Internal
Communication Protocol) abbreviation；The MDB/ICP buses are referred to as MDB buses.
Currently, MDB/ICP bus protocols (Multi-Drop Bus/Internal Communication Protocol)
Be European vending machine manufacture NAB National Association 0f Broadcasters formulate for coordinating between the master controller (VMC) of automatically vending system and multiple peripheral hardwares
The agreement of communication, the automatic vending machine that support bank note traditional at present is paid in cash is in payment portion (mainboard of selling goods and coin
Device/paper money device) it is all made of the communication protocol.
For example, the patent of Publication No. CN2864828Y disclose it is a kind of automatic with non-contact clip-type MDB controllers
Vending machine, including executing agency, master control system, wherein executing agency include time holding circuit, Cargo Delivery System and keyboard；Master control
System includes master controller (VMC), MDB buses and the serial ports for connecting the master controller and MDB buses；The automatic vending machine is also
Include the non-contact clip-type MDB controllers for being connect with MDB buses and passing through MDB bus marco master controllers；The MDB controllers
Communication including card reader, microcontroller (MCU), the storage device for storing sales information or connection acquisition communication bus and MCU connects
Mouthful, MCU programs monitoring circuit WATCHDOG, the real time clock circuit (RTC) that clock is provided for MCU, storage program and data
EEPROM and the MDB interfaces for connecting MCU and MDB bus communications；The wherein described card reader includes receiving the radio frequency letter of non-contact card
Number antenna, the non-contact card module for reading and writing that is connect with antenna.For example, the patent of Publication No. CN2836108Y discloses one kind
Automatic coffee machine with non-contact clip-type MDB controllers, including executing agency, display input system (1) and master control system
System, wherein executing agency include Coffee Grinding organization of supply (4), water supply mechanism (8), sugar or other instant food organizations of supply
(5), cup storage and conveyer (6) and rabbling mechanism (7)；Master control system includes master controller (VMC), MDB buses and company
Connect the serial ports of the master controller and MDB buses；The automatic coffee machine further includes non-contact clip-type MDB controllers (3)；It is described
MDB controllers include card reader, microcontroller (MCU), the storage device for storing sales information or connection acquisition communication bus and MCU
Communication interface, MCU programs monitoring circuit WATCHDOG, real time clock circuit (RTC), the storage program that clock is provided for MCU
With the MDB interfaces of the EEPROM and connection MCU and MDB bus communications of data；The controller enables automatic coffee machine to use IC
Card electronic payment mode.
So that there is circuit structures is relatively complicated, cost is higher, first for traditional telecommunication circuit design scheme at present
The disadvantage that part is fragile, versatility is poor.Number of elements needed for traditional MDB/ICP bus level conversion circuits is more, because
This its occupied area and cost are relatively high；There are the optic coupling element for being easier damage, stiffness of system in circuit
It is relatively low；Meanwhile the flexibility of the circuit is poor, is only applicable to 5V circuit systems, being if desired used for 3.3V or 1.5V systems also needs
In addition level shifting circuit and independent current source are added, cost is caused to greatly increase.
Invention content
The purpose of the present invention is to provide a kind of simplification suitable for MDB/ICP buses that can overcome above-mentioned technical problem
Telecommunication circuit.
The simplification telecommunication circuit suitable for MDB/ICP buses of the present invention is provided using a pair of single triode not circuit
Inverting level needed for MDB/ICP buses.The MDB/ICP buses are referred to as MDB buses.
The present invention the simplification telecommunication circuit suitable for MDB/ICP buses include：VCM-TXD lines, Slave-TXD lines；Institute
It is the signal wire that signal is sent from the host of MDB buses to the slave of MDB buses to state VCM-TXD lines；The Slave-TXD lines are
The signal wire of signal is sent from the slave of MDB buses to the host of MDB buses.
The VCM-TXD lines include：The ends-TX TTL (Transistor-Transistor Logic), TTL
The ends-RX (Transistor-Transistor Logic), the first triode, the second triode, first resistor, second resistance,
Three resistance, the 4th resistance；The transmitting terminal of the ends the TTL-TX, that is, Transistor-Transistor Logic level line, abbreviation TTL-TX；The ends the TTL-RX, that is, TTL
The receiving terminal of level, abbreviation TTL-RX.The ends TTL-TX are connect by first resistor with the base stage of the first triode；Described
The emitter of one triode is connect by second resistance with power supply VCC.The emitter of first triode passes through the 4th resistance
It is connect with the base stage of the second triode；The collector of second triode is connect by 3rd resistor with power supply VCC；Described
The current collection of the two triodes extremely ends TTL-RX.The collector of first triode and the emitter of second triode are distinguished
Ground connection.
The Slave-TXD lines include：The ends TTL-RX, the ends TTL-TX, the 5th resistance, the ends GND；The ends TTL-TX are
The transmitting terminal of Transistor-Transistor Logic level line, abbreviation TTL-TX；The receiving terminal of the ends the TTL-RX, that is, Transistor-Transistor Logic level, abbreviation TTL-RX.Power supply VCC
It is connect with the ends TTL-RX, the ends TTL-TX by the 5th resistance.
The host of the MDB buses is known as VCM equipment, and the slave of the MDB buses is known as Slave equipment；The MDB/
ICP buses are referred to as MDB buses.Provide that the signal wire that signal is sent from the host of MDB buses to the slave of MDB buses is known as
VCM-TXD lines, that is, MDB standard 5P interfaces No. 3 lines.And send signal from the slave of MDB buses to the host of MDB buses
Signal wire be known as Slave-TXD lines, that is, the Line 1 of MDB standard 5P interfaces.In order to improve the anti-interference energy of MDB buses
Power, MDB buses regulation transmit signal using differential level.The VCM-TXD lines transmit signal using reversed level, also
It is using high level as logical zero, using low level as logical one.The Slave-TXD lines transmit letter using normal level
Number, using high level as logical one, using low level as logical zero.In the both ends of VCM-TXD lines setting triode single tube NOT gate electricity
Road makes VCM-TXD lines transmit information in the form of reversed level.Since Slave-TXD lines are communicated using fiduciary level, nothing
Level conversion need to be carried out, therefore uses the mode being connected directly.In order to improve anti-interference ability, transmission range is improved, therefore need
To add a pull-up resistor on Slave-TXD lines, the value size of the pull-up resistor is according to the length of cable of MDB buses
To determine.For the MDB buses within 1 meter, can be met the requirements using the pull-up resistor of 1k Ω.The present invention's is suitable for MDB/
The simplification telecommunication circuit of ICP buses is when in use, it is only necessary to which different MDB buses can be met by replacing the current-limiting resistance of different resistance values
The requirement of length only needs the resistance value for changing first resistor and the 4th resistance that can meet different MDB buses cables long
The requirement of degree.
The advantages of simplification telecommunication circuit suitable for MDB/ICP buses of the present invention is the number for being not only able to reduce element
Amount improves circuit reliability, cost-effective, while being also with good expansibility and adaptability.
Description of the drawings
Fig. 1 is the electrical block diagram of the simplification telecommunication circuit of the present invention suitable for MDB/ICP buses；
Fig. 2 is the level standard schematic diagram of MDB/ICP buses.
Specific implementation mode
Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.As shown in Figure 1, the host of MDB buses claims
Slave for VCM equipment, MDB buses is known as Slave equipment；The MDB/ICP buses are referred to as MDB buses.Regulation is total by MDB
The signal wire that the host of line sends signal to the slave of MDB buses is known as VCM-TXD lines, that is, No. 3 of MDB standard 5P interfaces
Line.And the signal wire that signal is sent from the slave of MDB buses to the host of MDB buses is known as Slave-TXD lines, that is, MDB
The Line 1 of standard 5P interfaces.In order to improve the anti-interference ability of MDB buses, MDB buses regulation transmits letter using differential level
Number.As shown in Fig. 2, the VCM-TXD lines transmit signal using reversed level, that is, using high level as logical zero, with
Low level is as logical one.The Slave-TXD lines transmit signal using normal level, using high level as logical one, with
Low level is logical zero.Specific implementation mode is that triode single tube not circuit is arranged at the both ends of VCM-TXD lines, makes VCM-
TXD lines transmit information in the form of reversed level.Since Slave-TXD lines are communicated using fiduciary level, without carrying out electricity
Flat turn is changed, therefore uses the mode being connected directly.In order to improve anti-interference ability, transmission range is improved, it is therefore desirable to
A pull-up resistor is added on Slave-TXD lines, the value size of the pull-up resistor is come true according to the length of cable of MDB buses
It is fixed.For the MDB buses within 1 meter, can be met the requirements using the pull-up resistor of 1k Ω.
The simplification telecommunication circuit suitable for MDB/ICP buses of the present invention is when in use, it is only necessary to replace different resistance values
Current-limiting resistance can meet the requirement of different MDB bus lengths, i.e., only need to change the first resistor R1 and the 4th in Fig. 1
The resistance value of resistance R4 can meet the requirement of different MDB buses length of cable.In an embodiment of the present invention, such as Fig. 1 institutes
First triode Q1 of the circuit shown and the second triode Q2 select 8050 triodes；Also it can be selected according to MDB bus lengths
Determine the model of triode, the amplification factor β of 8050 triode is 30-100,80 is set as, according to MDB/ICP bus marks
Standard, VCM equipment need to provide the bus driver electric current of no less than 100ma, specifically refer to national automation sale society (NAMA)
The MDB/ICP technical manuals provided with European vending machine association (EVA) official, therefore the base current of 1.25ma need to be provided.Base
The misfortune voltage Vbe of pole and emitter takes 0.7V, then the calculation formula of current-limiting resistance first resistor R1 is：
Wherein, VinFor the level standard of MDB/ICP bus apparatus, VinWith the supply voltage phase of selected master controller
Deng.R5 is the ends Slave pull-up resistor, and the resistance value of R5 is adjusted determination according to MDB/ICP bus length of cable.Therefore, originally
The simplification telecommunication circuit suitable for MDB/ICP buses of invention has good autgmentability and higher stability and substantially reduces
Cost also reduces volume simultaneously.
The simplification telecommunication circuit specific work process suitable for MDB/ICP buses of the present invention is as follows：
As shown in Figure 1, when circuit works, the common level signal from VCM equipment, from the VCM-TXD lines
The ends TTL-TX input, the transmitting terminal of the ends the TTL-TX, that is, Transistor-Transistor Logic level line, by the single tube NOT gate being made of the first triode Q1
Circuit inverts its level, i.e., high level becomes low level, and low level becomes high level, and the signal of level reversion is sent into institute
VCM-TXD lines are stated to be transmitted.After signal transmission to Slave-TXD lines, the 4th resistance R4 of current limiting safeguard resistor is first passed through, then
It is inverted into line level by the single tube not circuit being made of the second triode Q2, reversed level signal is reduced to fiduciary level
The signal of reduction is sent to Slave equipment, the ends the TTL-RX, that is, TTL by the ends TTL-RX of Slave-TXD lines after signal
The receiving terminal of level.It is transmitted using fiduciary level on the Slave-TXD lines, without carrying out level conversion, therefore is used
The mode being directly connected to.In order to improve signal transmission distance, a pull-up resistor R5 is added on Slave-TXD lines.R5's
Value is adjusted according to the length of cable of MDB buses.If the length of cable of MDB buses is too short, to protect Slave equipment,
A current limiting safeguard resistor of connecting on Slave-TXD lines under the premise of MDB bus communications is not influenced.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
In range disclosed by the invention, the change or replacement that can be readily occurred in should all be contained those familiar with the art
Lid is within the scope of the invention as claimed.
Claims (5)
1. a kind of simplification telecommunication circuit suitable for MDB/ICP buses, which is characterized in that using a pair of single triode not circuit
To provide the inverting level needed for MDB/ICP buses；Including：VCM-TXD lines, Slave-TXD lines；The VCM-TXD lines be by
The host of MDB buses sends the signal wire of signal to the slave of MDB buses；The Slave-TXD lines are by the slave of MDB buses
The signal wire of signal is sent to the host of MDB buses；
The VCM-TXD lines include：The ends TTL-TX, the ends TTL-RX, the first triode, the second triode, first resistor, the second electricity
Resistance, 3rd resistor, the 4th resistance；The transmitting terminal of the ends the TTL-TX, that is, Transistor-Transistor Logic level line, the ends the TTL-RX, that is, Transistor-Transistor Logic level
Receiving terminal, the ends TTL-TX are connect by first resistor with the base stage of the first triode；The emitter of first triode
It is connect with power supply VCC by second resistance；The base that the emitter of first triode passes through the 4th resistance and the second triode
Pole connects；The collector of second triode is connect by 3rd resistor with power supply VCC；The collector of second triode
For the ends TTL-RX, the collector of first triode and the emitter of second triode are grounded respectively.
2. a kind of simplification telecommunication circuit suitable for MDB/ICP buses according to claim 1, which is characterized in that described
Slave-TXD lines include：The ends TTL-RX, the ends TTL-TX, the 5th resistance, the ends GND；The hair of the ends the TTL-TX, that is, Transistor-Transistor Logic level line
Sending end；The receiving terminal of the ends the TTL-RX, that is, Transistor-Transistor Logic level, power supply VCC pass through the 5th resistance and the ends TTL-RX, described
The ends TTL-TX connect.
3. a kind of simplification telecommunication circuit suitable for MDB/ICP buses according to claim 1, which is characterized in that only need
The requirement of different MDB buses length of cable can be met by changing the resistance value of the first resistor and the 4th resistance.
4. a kind of simplification telecommunication circuit suitable for MDB/ICP buses according to claim 1, which is characterized in that described
VCM-TXD lines are No. 3 lines of MDB standard 5P interfaces.
5. special according to a kind of simplification telecommunication circuit suitable for MDB/ICP bus of the claims 1 or 2 described in any one
Sign is that the Slave-TXD lines are the Line 1s of MDB standard 5P interfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610488190.5A CN105893287B (en) | 2016-06-28 | 2016-06-28 | A kind of simplification telecommunication circuit suitable for MDB/ICP buses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610488190.5A CN105893287B (en) | 2016-06-28 | 2016-06-28 | A kind of simplification telecommunication circuit suitable for MDB/ICP buses |
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| CN105893287A CN105893287A (en) | 2016-08-24 |
| CN105893287B true CN105893287B (en) | 2018-11-09 |
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| CN201610488190.5A Expired - Fee Related CN105893287B (en) | 2016-06-28 | 2016-06-28 | A kind of simplification telecommunication circuit suitable for MDB/ICP buses |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2793803Y (en) * | 2005-05-20 | 2006-07-05 | 海信集团有限公司 | Simple port and interface circuit |
| CN201499241U (en) * | 2009-09-16 | 2010-06-02 | 青岛海信电器股份有限公司 | Powering-on music circuit and television comprising thereof |
| CN205910687U (en) * | 2016-06-28 | 2017-01-25 | 陶帅 | Simplify communication circuit suitable for MDBICP bus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS607521A (en) * | 1983-06-25 | 1985-01-16 | Nec Corp | Control system for file memory |
-
2016
- 2016-06-28 CN CN201610488190.5A patent/CN105893287B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2793803Y (en) * | 2005-05-20 | 2006-07-05 | 海信集团有限公司 | Simple port and interface circuit |
| CN201499241U (en) * | 2009-09-16 | 2010-06-02 | 青岛海信电器股份有限公司 | Powering-on music circuit and television comprising thereof |
| CN205910687U (en) * | 2016-06-28 | 2017-01-25 | 陶帅 | Simplify communication circuit suitable for MDBICP bus |
Non-Patent Citations (1)
| Title |
|---|
| 基于移动支付的自动售货机;詹昌平，金瓯;《现代电子技术》;20041231(第17期);第39页第4.1-4.2节，图2-3 * |
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| CN105893287A (en) | 2016-08-24 |
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Effective date of registration: 20180928 Address after: 116085 room 804, block B, block 32, Torch Road, Dalian hi tech Industrial Park, Liaoning, China, 804 Applicant after: DALIAN QIANHAN TECHNOLOGY CO.,LTD. Address before: 710089 Xi'an District, Yanliang, Shaanxi Province revitalization of street four new group of villages Applicant before: Tao Shuai |
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