CN205910687U - Simplify communication circuit suitable for MDBICP bus - Google Patents
Simplify communication circuit suitable for MDBICP bus Download PDFInfo
- Publication number
- CN205910687U CN205910687U CN201620665947.9U CN201620665947U CN205910687U CN 205910687 U CN205910687 U CN 205910687U CN 201620665947 U CN201620665947 U CN 201620665947U CN 205910687 U CN205910687 U CN 205910687U
- Authority
- CN
- China
- Prior art keywords
- mdb
- bus
- ttl
- audion
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Abstract
The utility model discloses a simplify communication circuit suitable for MDBICP bus, its characterized in that adopts a pair of single triode not circuit to provide the MDBICP bus required opposition level, the utility model discloses a simplify communication circuit suitable for MDBICP bus's advantage not only can reduce the quantity of component, improved circuit reliability, saving cost, gos back with good extensibility and adaptability simultaneously.
Description
Technical field
This utility model is related to a kind of simplification telecommunication circuit being applied to mdb/icp bus, belongs to communication technical field.
Background technology
The standard of mdb/icp bus protocol (multi-drop bus/internal communication protocol)
It is to be developed in the specified lower of Coca-Cola Co. by coinco first.This standard was adopted by nama association in 1993
With；After special working group's revision, adopted by evmma in 1994.The non-cash transaction standard of second stage by
Debitek represents nama exploitation, and is adopted by nama in 1994；Evmma added the instruction of some compatibilities after 1994
Using.Mdb interface actually works in the master-slave type serial bus interface of 9600 baud rates, ancillary equipment used, for example
Coin-freed arrangement, paper money device, card reader are main frame (vcm) the i.e. slave of vending machine controller.All ancillary equipment and vending machine control
Communication mode between device processed is all consistent.Mdb is mdb/icp agreement (multi-drop bus/internal
Communication protocol) abbreviation；Described mdb/icp bus is referred to as mdb bus.
At present, mdb/icp bus protocol (multi-drop bus/internal communication protocol)
It is that European vending machine manufactures the master controller (vmc) for coordinating automatically vending system of NAB National Association 0f Broadcasters' formulation and multiple peripheral hardware between
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) all using this communication protocol.
For example, the patent of Publication No. cn2864828y disclose a kind of automatic with non-contact clip-type mdb controller
Vending machine, including actuator, master control system, wherein actuator includes time holding circuit, Cargo Delivery System and keyboard；Master control
System includes master controller (vmc), mdb bus and connects this master controller and the serial ports of mdb bus；Described automatic vending machine is also
Including the non-contact clip-type mdb controller being connected and passing through mdb bus marco master controller with mdb bus；Described mdb controller
Communication including card reader, single-chip microcomputer (mcu), the storage device of storage sales information or connection collection communication bus and mcu connects
Mouth, mcu program monitoring circuit watchdog, provide the real time clock circuit (rtc) of clock, storage program data for mcu
Eeprom and the mdb interface connecting mcu and mdb bus communication；Wherein said card reader includes the radio frequency letter receiving non-contact card
Number the non-contact card module for reading and writing that is connected with antenna of antenna.For example, the patent of Publication No. cn2836108y discloses one kind
Automatic coffee machine with non-contact clip-type mdb controller, including actuator, display input system (1) and master control system
System, wherein actuator includes Coffee Grinding organization of supply (4), water supply mechanism (8), sugared or other instant food organization of supply
(5), cup storage and conveyer (6) and rabbling mechanism (7)；Master control system includes master controller (vmc), mdb bus and company
Connect this master controller and the serial ports of mdb bus；Described automatic coffee machine also includes non-contact clip-type mdb controller (3)；Described
Mdb controller includes card reader, single-chip microcomputer (mcu), the storage device of storage sales information or connects collection communication bus and mcu
Communication interface, mcu program monitoring circuit watchdog, provide the real time clock circuit (rtc) of clock, storage program for mcu
The eeprom of data and the mdb interface connecting mcu and mdb bus communication；This controller enables automatic coffee machine to use ic
Card electronic payment mode.
So, it is relatively complicated, relatively costly, first that telecommunication circuit design traditional at present has circuit structure
The shortcoming that part is fragile, versatility is poor.Traditional number of elements needed for mdb/icp bus level change-over circuit is more, because
This its occupied area and cost are all of a relatively high；There are the optic coupling element being easier to damage, stiffness of system in circuit
Relatively low；Meanwhile, the motility of this circuit is poor, is only applicable to 5v Circuits System, if desired also needs for 3.3v or 1.5v system
In addition to add level shifting circuit and independent current source, to lead to cost to greatly increase.
Utility model content
The purpose of this utility model be to provide a kind of can overcome above-mentioned technical problem be applied to mdb/icp bus
Simplify telecommunication circuit.
The simplification telecommunication circuit being applied to mdb/icp bus of the present utility model adopts a pair single audion not circuit
Inverting level needed for mdb/icp bus is provided.Described mdb/icp bus is referred to as mdb bus.
The simplification telecommunication circuit being applied to mdb/icp bus of the present utility model includes: vcm-txd line, slave-txd
Line；Described vcm-txd line is from the holding wire of the slave sending signal to mdb bus for the main frame of mdb bus；Described slave-
Txd line is from the holding wire of the main frame sending signal to mdb bus for the slave of mdb bus.
Described vcm-txd line includes: ttl (transistor-transistor logic)-tx end, ttl
(transistor-transistor logic)-rx end, the first audion, the second audion, first resistor, second resistance,
Three resistance, the 4th resistance；Described ttl-tx end is the transmitting terminal of ttl level line, abbreviation ttl-tx；Described ttl-rx end is ttl
The receiving terminal of level, abbreviation ttl-rx.Described ttl-tx end is connected with the base stage of the first audion by first resistor；Described
The emitter stage of one audion is connected with power supply vcc by second resistance.The emitter stage of described first audion passes through the 4th resistance
It is connected with the base stage of the second audion；The colelctor electrode of described second audion is connected with power supply vcc by 3rd resistor；Described
The current collection of two audions extremely ttl-rx end.The emitter stage of the colelctor electrode of described first audion and described second audion is respectively
Ground connection.
Described slave-txd line includes: ttl-rx end, ttl-tx end, the 5th resistance, gnd end；Described ttl-tx end is
The transmitting terminal of ttl level line, abbreviation ttl-tx；Described ttl-rx end is the receiving terminal of ttl level, abbreviation ttl-rx.Power supply vcc
It is connected with described ttl-rx end, described ttl-tx end by described 5th resistance.
The main frame of described mdb bus is referred to as vcm equipment, and the slave of described mdb bus is referred to as slave equipment；Described mdb/
Icp bus is referred to as mdb bus.Regulation is referred to as from the holding wire of the slave sending signal to mdb bus for the main frame of mdb bus
Vcm-txd line, that is, No. 3 lines of mdb standard 5p interface.And from mdb bus main frame sending signal from slave to mdb bus
Holding wire be referred to as slave-txd line, that is, the Line 1 of mdb standard 5p interface.In order to improve the anti-interference energy of mdb bus
Power, mdb bus regulation transmits signal using differential level.Described vcm-txd line to transmit signal using reverse level, also
It is using high level as logical zero, using low level as logical one.Described slave-txd line to transmit letter using normal level
Number, with high level as logical one, with low level as logical zero.In the two ends of vcm-txd line setting audion single tube not gate electricity
Road, makes vcm-txd line transmit information in the form of reverse level.Because slave-txd line is communicated using fiduciary level, no
Level conversion need to be carried out, therefore using the mode being joined directly together.In order to improve capacity of resisting disturbance, improve transmission range, therefore need
One pull-up resistor to be added on slave-txd line, the value size of described pull-up resistor is according to the length of cable of mdb bus
To determine.For the mdb bus within 1 meter, the pull-up resistor using 1k ω can meet requirement.Of the present utility model it is applied to
The simplification telecommunication circuit of mdb/icp bus is when using it is only necessary to the current-limiting resistance changing different resistances can meet different mdb
The use requirement of bus length, that is, only need to change first resistor and just can meet different mdb Bus Wires with the resistance of the 4th resistance
The use requirement of cable length.
The advantage of the simplification telecommunication circuit being applied to mdb/icp bus of the present utility model is not only able to reduce element
Quantity, improve circuit reliability, cost-effective, be also with good expansibility and adaptability simultaneously.
Brief description
Fig. 1 is the electrical block diagram of the simplification telecommunication circuit being applied to mdb/icp bus described in the utility model；
Fig. 2 is the level standard schematic diagram of mdb/icp bus.
Specific embodiment
Below in conjunction with the accompanying drawings embodiment of the present utility model is described in detail.As shown in figure 1, the master of mdb bus
Machine is referred to as vcm equipment, and the slave of mdb bus is referred to as slave equipment；Described mdb/icp bus is referred to as mdb bus.Regulation by
The holding wire of the slave sending signal to mdb bus for the main frame of mdb bus is referred to as vcm-txd line, that is, mdb standard 5p interface
No. 3 lines.And slave-txd line is referred to as from the holding wire of the main frame sending signal to mdb bus for the slave of mdb bus, also
It is the Line 1 of mdb standard 5p interface.In order to improve the capacity of resisting disturbance of mdb bus, mdb bus regulation is come using differential level
Transmission signal.As shown in Fig. 2 described vcm-txd line to transmit signal using reverse level, that is, using high level as logic
" 0 ", using low level as logical one.Described slave-txd line to transmit signal using normal level, with high level as logic
" 1 ", with low level as logical zero.Specific embodiment is to arrange audion single tube not circuit at the two ends of vcm-txd line,
Vcm-txd line is made to transmit information in the form of reverse level.Because slave-txd line is communicated using fiduciary level, need not
Carry out level conversion, therefore using the mode being joined directly together.In order to improve capacity of resisting disturbance, improve transmission range it is therefore desirable to
One pull-up resistor is added on slave-txd line, the value size of described pull-up resistor according to the length of cable of mdb bus Lai
Determine.For the mdb bus within 1 meter, the pull-up resistor using 1k ω can meet requirement.
The simplification telecommunication circuit being applied to mdb/icp bus of the present utility model hinders it is only necessary to change difference when using
The current-limiting resistance of value can meet the use requirement of different mdb bus length, that is, only need to change Fig. 1 in first resistor r1 and
The resistance of the 4th resistance r4 just can meet the use requirement of different mdb bus length of cable.In embodiment of the present utility model,
First audion q1 of circuit as shown in Figure 1 and the second audion q2 selects 8050 audions；Also can be according to mdb bus length
To select to determine the model of audion, amplification β of described 8050 audions is 30-100, is set to 80, total according to mdb/icp
Line standard, vcm equipment need to provide the bus driver electric current no less than 100ma, specifically refers to national automation sale society
(nama) and the mdb/icp technical manual that provides of European vending machine association (eva) official, therefore need to provide the base stage electricity of 1.25ma
Stream.Base stage takes 0.7v with the misfortune voltage vbe of emitter stage, then the computing formula of current-limiting resistance first resistor r1 is:
Wherein, vinFor the level standard of mdb/icp bus apparatus, vinSupply voltage phase with selected master controller
Deng.R5 is slave end pull-up resistor, and the resistance value of r5 is adjusted determining according to mdb/icp bus length of cable.Therefore, originally
The simplification telecommunication circuit being applied to mdb/icp bus of utility model has good autgmentability and higher stability significantly
Reduce cost and also reduce volume simultaneously.
The simplification telecommunication circuit specific work process being applied to mdb/icp bus of the present utility model is as follows:
As shown in figure 1, when circuit works, from the common level signal of vcm equipment, from described vcm-txd line
Ttl-tx end inputs, and described ttl-tx end is the transmitting terminal of ttl level line, through the single tube not gate being made up of the first audion q1
Its level is inverted by circuit, and that is, high level is changed into low level, and low level is changed into high level, and the signal that level is inverted sends into institute
State vcm-txd line to be transmitted.Signal transmission, to after slave-txd line, first passes through current limiting safeguard resistor the 4th resistance r4, then
Single tube not circuit through being made up of the second audion q2 enters line level reversion, and reverse level signal is reduced to fiduciary level
After signal, the signal of reduction is sent to slave equipment by the ttl-rx end of slave-txd line, described ttl-rx end is ttl
The receiving terminal of level.It is transmitted using fiduciary level on described slave-txd line, level conversion need not be carried out, therefore use
The mode being directly connected to.In order to improve signal transmission distance, a pull-up resistor r5 be with the addition of on slave-txd line.R5's
Value is adjusted according to the length of cable of mdb bus.If the length of cable of mdb bus is too short, for protecting slave equipment,
Do not affect to connect on slave-txd line on the premise of mdb bus communication a current limiting safeguard resistor.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model does not limit to
In this, any those familiar with the art in this utility model scope of disclosure, the change that can readily occur in
Or replace, all should cover in this utility model scope of the claims.
Claims (6)
1. a kind of simplification telecommunication circuit being applied to mdb/icp bus is it is characterised in that adopt a pair single audion not circuit
Inverting level needed for mdb/icp bus to be provided；Including: vcm-txd line, slave-txd line；Described vcm-txd line be by
The holding wire of the slave sending signal to mdb bus for the main frame of mdb bus；Described slave-txd line is by the slave of mdb bus
Holding wire to the main frame sending signal of mdb bus.
2. a kind of simplification telecommunication circuit being applied to mdb/icp bus according to claim 1 is it is characterised in that described
Vcm-txd line includes: ttl-tx end, ttl-rx end, the first audion, the second audion, first resistor, second resistance, the 3rd
Resistance, the 4th resistance；Described ttl-tx end is the transmitting terminal of ttl level line, and described ttl-rx end is the receiving terminal of ttl level,
Described ttl-tx end is connected with the base stage of the first audion by first resistor；The emitter stage of described first audion passes through second
Resistance is connected with power supply vcc；The emitter stage of described first audion is connected with the base stage of the second audion by the 4th resistance；Institute
The colelctor electrode stating the second audion is connected with power supply vcc by 3rd resistor；The current collection extremely ttl-rx of described second audion
End, the colelctor electrode of described first audion is grounded respectively with the emitter stage of described second audion.
3. a kind of simplification telecommunication circuit being applied to mdb/icp bus according to claim 1 is it is characterised in that described
Slave-txd line includes: ttl-rx end, ttl-tx end, the 5th resistance, gnd end；Described ttl-tx end is sending out of ttl level line
Sending end；Described ttl-rx end is the receiving terminal of ttl level, and power supply vcc passes through described 5th resistance and described ttl-rx end, described
Ttl-tx end connects.
4. a kind of simplification telecommunication circuit being applied to mdb/icp bus according to claim 2 is it is characterised in that only need
Change described first resistor and the resistance of the 4th resistance just can meet the use requirement of different mdb bus length of cable.
5. any one described a kind of simplification telecommunication circuit being applied to mdb/icp bus according to claim 1 or 2, it is special
Levy and be, described vcm-txd line is No. 3 lines of mdb standard 5p interface.
6. any one described a kind of simplification telecommunication circuit being applied to mdb/icp bus according to claim 1 or 3, it is special
Levy and be, described slave-txd line is the Line 1 of mdb standard 5p interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620665947.9U CN205910687U (en) | 2016-06-28 | 2016-06-28 | Simplify communication circuit suitable for MDBICP bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620665947.9U CN205910687U (en) | 2016-06-28 | 2016-06-28 | Simplify communication circuit suitable for MDBICP bus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205910687U true CN205910687U (en) | 2017-01-25 |
Family
ID=57812221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620665947.9U Withdrawn - After Issue CN205910687U (en) | 2016-06-28 | 2016-06-28 | Simplify communication circuit suitable for MDBICP bus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205910687U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105893287A (en) * | 2016-06-28 | 2016-08-24 | 陶帅 | Simplified communication circuit applicable to MDB/ICP bus |
-
2016
- 2016-06-28 CN CN201620665947.9U patent/CN205910687U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105893287A (en) * | 2016-06-28 | 2016-08-24 | 陶帅 | Simplified communication circuit applicable to MDB/ICP bus |
| CN105893287B (en) * | 2016-06-28 | 2018-11-09 | 大连乾函科技有限公司 | A kind of simplification telecommunication circuit suitable for MDB/ICP buses |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6543690B2 (en) | Method and apparatus for communicating with a host | |
| CN100373780C (en) | Data transfer control device and electronic instrument | |
| CN102074076A (en) | Intelligent electric meter centralized recharging terminal and control method thereof | |
| CN103677671A (en) | Data reading-writing method and system of electrical port module | |
| CN206258975U (en) | A kind of utilization bluetooth communication realizes the card reader/writer that IC-card is supplemented with money | |
| JP2010028670A (en) | Serial communication system | |
| CN100489807C (en) | Computer system status monitoring circuit | |
| CN205910687U (en) | Simplify communication circuit suitable for MDBICP bus | |
| CN206146465U (en) | Box transformer monitoring device | |
| CN101367384A (en) | Energy consumption recording instrument for WorldFIP interface type motorcycle | |
| CN205656714U (en) | New forms of energy electric automobile fills electric pile expense non -contact credit card settlement device that charges | |
| CN203260124U (en) | Intelligent gas meter system with long-distance top-up and pre-payment functions | |
| CN105893287B (en) | A kind of simplification telecommunication circuit suitable for MDB/ICP buses | |
| CN109801436B (en) | Cash payment protocol conversion system of vending machine | |
| CN110855696A (en) | Protocol switching equipment suitable for MDB/ICP bus tandem connection payment module | |
| CN100514349C (en) | Home appliance control device with dual-interface radio frequency card reader | |
| CN103679101B (en) | Handset audio reader device and system | |
| CN102622815A (en) | Electric vehicle charging tolling system based on power line carrier | |
| CN214670882U (en) | STS prepayment gas meter based on bluetooth communication | |
| CN201637779U (en) | Non-card carrier-wave prepayment watt-hour meter | |
| CN204883837U (en) | Taximeter with NFC near field payment function | |
| CN205038645U (en) | Ammeter with fingerprint authentication function | |
| CN202058240U (en) | Measuring instrument and charging device thereof | |
| CN207781144U (en) | Test device | |
| CN202615500U (en) | Charging device for charging electric car based on power line carrier (PLC) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170331 Address after: 116085 room, room, block B, No. 32, Torch Road, Dalian high tech Industrial Park, Dalian, Liaoning, China Patentee after: Dalian letter Technology Co., Ltd. Address before: 710089 Shaanxi Province, Yanliang District revitalization of the street to do the new village to the group of four Patentee before: Tao Shuai |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170125 Effective date of abandoning: 20181109 |