CN105404213B - A kind of serial communication device and method of direct current carrier - Google Patents
A kind of serial communication device and method of direct current carrier Download PDFInfo
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- CN105404213B CN105404213B CN201511017117.1A CN201511017117A CN105404213B CN 105404213 B CN105404213 B CN 105404213B CN 201511017117 A CN201511017117 A CN 201511017117A CN 105404213 B CN105404213 B CN 105404213B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/23—Pc programming
- G05B2219/23049—Control panel serial, RS232 connected to controller
Abstract
The present invention provides the serial communication device and method of a kind of direct current carrier, and the serial communication device includes：Master control borad circuit and line traffic control plate circuit, it is attached between the first serial of the master control borad circuit and the second serial of line traffic control plate circuit by both threads cable, wherein, the master control borad circuit and line traffic control plate circuit are respectively by the load of the transmitting pulse timesharing of serial communication on the power supply line of cable, level on power supply line of the receiving end of the serial communication by detecting cable just receives signal, when the first serial of master control borad circuit emits signal, the second serial of the line traffic control plate circuit receives signal；When the second serial of line traffic control plate circuit emits signal, the first serial of the master control borad circuit receives signal.The present invention is only used only both threads cable and has just achieved the purpose that not only to have realized serial communication but also be the power supply of line traffic control plate circuit, and then has saved the cost of two root long cables, while without battery power supply, reducing the difficulty and maintenance cost of circuit design.
Description
Technical field
The present invention relates to a kind of serial communication device more particularly to a kind of serial communication devices of direct current carrier, and are related to
The method of serial communication device applied to the direct current carrier.
Background technique
The length of cable developed for line control machine, need to realize power supply and communication function simultaneously, and needed will 5 meters with
On；In this design, often power supply and communication are separated, 2 cables is needed to power for cable power supply or using battery, 2
Root cable is communicated, and in this case just needs 4 longer cables altogether, such words cable cost is very high, and its 485 side
The price of case is also higher；And if using battery power supply mode, electric power management circuit is extremely complex, frequently dirt of the replacement to environment
It contaminates very serious.
Summary of the invention
The technical problem to be solved by the present invention is to need to provide a kind of save the cost and to reduce the straight of development difficulty
The serial communication device of carrier wave is flowed, and the method for being applied to the serial communication device of the direct current carrier is provided.
In this regard, the present invention provides a kind of serial communication device of direct current carrier, including：Master control borad circuit and line traffic control plate electricity
Road is attached between the first serial of the master control borad circuit and the second serial of line traffic control plate circuit by both threads cable,
In, the master control borad circuit and line traffic control plate circuit respectively by the load of the transmitting pulse timesharing of serial communication cable power supply line
On, the level on power supply line of the receiving end of the serial communication by detecting cable just receives signal, when master control borad electricity
When the first serial on road emits signal, the second serial of the line traffic control plate circuit receives signal；When the second string of line traffic control plate circuit
When mouth transmitting signal, the first serial of the master control borad circuit receives signal.
A further improvement of the present invention is that the master control borad circuit includes the first control module, constant-current source circuit and the
One logic control circuit, first control module and constant-current source circuit are connected with first logic control circuit respectively.
A further improvement of the present invention is that the line traffic control plate circuit include the second control module, current rectifying and wave filtering circuit and
Second logic control circuit, second control module and current rectifying and wave filtering circuit are connected with second logic control circuit respectively
It connects.
A further improvement of the present invention is that the constant-current source voltage of the constant-current source circuit is 12V, constant current source current 50
~100mA.In practical applications, constant-current source voltage and current can be changed according to actual design requirement, and constant current source current can pass through
Change the value of resistance R1 in circuit to set, the constant current source current of preferred settings is less than 100mA.
A further improvement of the present invention is that the constant-current source circuit includes triode T1, resistance R1, triode T2 and electricity
R3 is hindered, the emitter of the triode T1 and one end of resistance R1 are connected to power end, the base stage and resistance of the triode T1
The other end of R1 is connected with the emitter of the triode T2 respectively, the collector of the triode T1 and the base of triode T2
Pole passes through resistance R3 respectively and is grounded, and the collector of the triode T2 is connected with first logic control circuit.Wherein, institute
Resistance R1 is stated for setting the constant current source current size of constant-current source circuit.
A further improvement of the present invention is that first logic control circuit includes resistance R2, resistance R4, triode
T3, resistance R9, resistance R7, triode T4, resistance R11, resistance R14 and capacitor C6, one end of the resistance R2 and triode T3
Emitter be respectively connected to hot end, the other end of the resistance R2 is connected to the single-chip microcontroller of first control module
Emission control pin, the base stage of the triode T3 are connected to the transmitting of the single-chip microcontroller of first control module by resistance R4
Pin is controlled, the collector of the triode T3 is respectively connected to one end of resistance R9 and one end of resistance R7, the resistance R9
Other end ground connection, the other end of the resistance R7 is connected to the base stage of triode T4, the collector difference of the triode T4
It is connected with one end of first serial and resistance R11, the emitter ground connection of the triode T4, the other end of the resistance R11
It is connected respectively with the reception of the single-chip microcontroller of one end of the resistance R14, one end of capacitor C6 and the first control module control pin
It connects, the other end of the resistance R14 and the other end of capacitor C6 are grounded respectively.
A further improvement of the present invention is that the first control module further includes capacitor C3, capacitor C4 and capacitor C5, described
The power pin of the single-chip microcontroller of one control module passes through capacitor C3, capacitor C4 and capacitor C5 ground connection respectively.
A further improvement of the present invention is that second logic control circuit includes resistance R13, resistance R15, capacitor
C7, triode T6, capacitor R10, triode T5, resistance R12, resistance R8, resistance R5 and resistance R6, the second serial respectively with
The single-chip microcontroller of one end of the resistance R13, the collector of triode T6 and the second control module is connected, the resistance R13's
The other end is connected with one end of one end of the resistance R15 and capacitor C7 respectively, the other end and capacitor C7 of the resistance R15
The other end be grounded respectively, the base stage of the emitter of triode T6 ground connection, the triode T6 is connected respectively by resistance R10
It is connected to one end of the resistance R12 and the collector of triode T5, the emitter of the triode T5 is connected to hot end, institute
The base stage for stating triode T5 is connected to one end of resistance R5 by resistance R8, the other end of the resistance R5 respectively with hot end
It is connected with one end of resistance R6, the other end of the resistance R6 is connected to the single-chip microcontroller of second control module.
A further improvement of the present invention is that the current rectifying and wave filtering circuit includes diode D1, polarized capacitor E1, capacitor
C1, voltage-stablizer U1, capacitor C2 and polarized capacitor E2, the anode of the diode D1 are connected with the collector of the triode T6
It connects, the cathode of the diode D1 is defeated with the anode of the polarized capacitor E1, one end of capacitor C1 and voltage-stablizer U1 respectively
Enter pin to be connected, the positive and negative anodes of the polarized capacitor E1 and the other end of capacitor C1 are grounded respectively, the voltage-stablizer U1's
Output end is connected with the anode of hot end, one end of capacitor C2 and polarized capacitor E2 respectively, and the capacitor C2's is another
The cathode of end and polarized capacitor E2 are grounded respectively.Wherein, afterflow function when polarized capacitor E1 is for serial communication, two poles
Pipe D1 is for preventing the electric energy of polarized capacitor E1 from discharging by power supply line, to guarantee the line traffic control plate electricity in the low level of communication
The power supply stability on road.
The present invention also provides a kind of serial port communication methods of direct current carrier, the serial ports applied to direct current carrier as described above
Communication device, and include the following steps：
Step S1 realizes serial communication by the power supply line low and high level of controlling cable；
Step S2, the drive end by line traffic control plate circuit as serial communication issue request signal；Master control borad circuit is examined in real time
Request signal is surveyed, feedback signal completes serial communication after detecting request signal；
Step S3, when transmitting signal, if having pole in the current rectifying and wave filtering circuit 5 of line traffic control plate circuit between low period
Property capacitor E1 be line traffic control plate circuit power supply afterflow；If power supply line is the polarized electricity of current rectifying and wave filtering circuit 5 between high period
Hold E1 charging；In no transmission signal, power supply line normally provides stable 12V level.
The line traffic control plate circuit is the drive end of serial communication, actively issues signal, issues request signal；Master control borad circuit
For Partner, the request signal of line traffic control plate is received, feedback signal gives line traffic control plate circuit after response, and it is total that serial ports thus may be implemented
The occupancy and release of line；Serial port corresponding to the power supply line low and high level can be matched according to the demand of user
It sets.
Compared with prior art, the beneficial effects of the present invention are：Based on DC power supply, power supply line carries out data transmission,
Wherein, the master control borad circuit and line traffic control plate circuit respectively by the load of the transmitting pulse timesharing of serial communication cable power supply
On line, the level on power supply line of the receiving end of the serial communication by detecting cable just receives signal, works as master control borad
When the first serial of circuit emits signal, the second serial of the line traffic control plate circuit receives signal；When the second of line traffic control plate circuit
When serial ports emits signal, the first serial of the master control borad circuit receives signal, and therefore, the present invention only only used both threads cable
Just achieved the purpose that not only to be able to achieve serial communication but also can power for line traffic control plate circuit, so saved two root long cables at
This, while without battery power supply, the difficulty and maintenance cost of circuit design are reduced, pollution of the battery to environment is reduced,
And communication is also realized by the serial ports of standard, is docked convenient for software debugging.
Detailed description of the invention
Fig. 1 is the system structure diagram of an embodiment of the present invention；
Fig. 2 is the circuit diagram of an embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing, preferably embodiment of the invention is described in further detail.
Embodiment 1：
As shown in Figure 1, this example provides a kind of serial communication device of direct current carrier, including：Master control borad circuit and line traffic control plate
Circuit is attached between the first serial of the master control borad circuit and the second serial of line traffic control plate circuit by both threads cable,
Wherein, the master control borad circuit and line traffic control plate circuit respectively by the load of the transmitting pulse timesharing of serial communication cable power supply
On line, the level on power supply line of the receiving end of the serial communication by detecting cable just receives signal, works as master control borad
When the first serial of circuit emits signal, the second serial of the line traffic control plate circuit receives signal；When the second of line traffic control plate circuit
When serial ports emits signal, the first serial of the master control borad circuit receives signal.
Master control borad circuit described in this example includes the first control module 1, constant-current source circuit 2 and the first logic control circuit 3, institute
The first control module 1 and constant-current source circuit 2 is stated to be connected with first logic control circuit 3 respectively.The line traffic control plate circuit
Including the second control module 4, current rectifying and wave filtering circuit 5 and the second logic control circuit 6, second control module 4 and rectification filter
Wave circuit 5 is connected with second logic control circuit 6 respectively.
Master control borad circuit described in this example is arranged promising line traffic control plate circuit and provides the constant-current source circuit 2 of power supply, the constant-current source
The supply voltage and constant current source current of circuit 2 will determine according to the power consumption of line traffic control plate circuit, the power consumption meeting of usual line traffic control plate circuit
< 3.3V 50 ~ 100mA of@, so the constant-current source voltage of constant-current source circuit 2 described in this example is preferably 12V, constant current source current is preferably limited
It is set to 50 ~ 100mA；In practical applications, constant-current source voltage and current can be changed according to actual design requirement, constant current source current
It can be set by changing the value of resistance R1 in circuit, the constant current source current of preferred settings is less than 100mA.The first serial and
The baud rate of serial communication between second serial is recommended to use 4800 and 9,600 two kind of baud rate, and all uses the string of standard
Cause for gossip now communicates.The cable is 5 meters or more of long cable, long cable preferably≤10 meter, because when cable is too long, by
It is more obvious in the parasitic character of cable itself, it may result in communication abnormality；Both threads cable described in this example include power supply line and
Ground wire, the master control borad circuit and line traffic control plate circuit respectively by serial communication transmitting pulse timesharing load cable power supply
On line, i.e., the function of power supply and timesharing serial communication is realized by power supply line.
In the line control machine exploitation of the prior art, the electric current that line control machine usually requires is also smaller, only less than 100mA, if
Power supply and communication are realized using 4 root long cables, and the cost of cable will remain high；Two change angle, according to battery into
The hardware cost of row power supply, this design is high, and circuit is complicated, pollutes environment.And in this example, it can be both by both threads cable
Realize the communication function for not only powering but also realizing serial mode.
As shown in Fig. 2, constant-current source circuit 2 described in this example includes triode T1, resistance R1, triode T2 and resistance R3, institute
One end of the emitter and resistance R1 of stating triode T1 is connected to power end, and the base stage of the triode T1 and resistance R1's is another
End is connected with the emitter of the triode T2 respectively, and the collector of the triode T1 and the base stage of triode T2 are led to respectively
Resistance R3 ground connection is crossed, the collector of the triode T2 is connected with first logic control circuit 3.First control module 1
It further include capacitor C3, capacitor C4 and capacitor C5, the power pin of the single-chip microcontroller of first control module 1 passes through capacitor respectively
C3, capacitor C4 and capacitor C5 ground connection.Wherein, the resistance R1 is used to set the constant current source current size of constant-current source circuit.
As shown in Fig. 2, first logic control circuit 3 includes resistance R2, resistance R4, triode T3, resistance R9, resistance
R7, triode T4, resistance R11, resistance R14 and capacitor C6, one end of the resistance R2 and the emitter of triode T3 connect respectively
It is connected to hot end, the other end of the resistance R2 is connected to the emission control pin of the single-chip microcontroller of first control module 1,
The base stage of the triode T3 is connected to the emission control pin of the single-chip microcontroller of first control module 1, institute by resistance R4
The collector for stating triode T3 is respectively connected to one end of resistance R9 and one end of resistance R7, another termination of the resistance R9
Ground, the other end of the resistance R7 are connected to the base stage of triode T4, the collector of the triode T4 respectively with first serial
Be connected with one end of resistance R11, the emitter of triode T4 ground connection, the other end of the resistance R11 respectively with it is described
One end of resistance R14, one end of capacitor C6 are connected with the reception of the single-chip microcontroller of the first control module 1 control pin, the electricity
The other end of the other end and capacitor C6 that hinder R14 is grounded respectively.
As shown in Fig. 2, second logic control circuit 6 includes resistance R13, resistance R15, capacitor C7, triode T6, electricity
Hold R10, triode T5, resistance R12, resistance R8, resistance R5 and resistance R6, the second serial is respectively with the resistance R13's
The single-chip microcontroller of one end, the collector of triode T6 and the second control module 4 is connected, the other end of the resistance R13 respectively with
One end of the resistance R15 is connected with one end of capacitor C7, the other end of the resistance R15 and the other end difference of capacitor C7
Ground connection, the emitter ground connection of the triode T6, the base stage of the triode T6 are respectively connected to the resistance by resistance R10
One end of R12 and the collector of triode T5, the emitter of the triode T5 are connected to hot end, the triode T5's
Base stage is connected to one end of resistance R5 by resistance R8, the other end of the resistance R5 respectively with hot end and resistance R6 one
End is connected, and the other end of the resistance R6 is connected to the single-chip microcontroller of second control module 4.
As shown in Fig. 2, the current rectifying and wave filtering circuit 5 include diode D1, polarized capacitor E1, capacitor C1, voltage-stablizer U1,
Capacitor C2 and polarized capacitor E2, the anode of the diode D1 are connected with the collector of the triode T6, two pole
The cathode of pipe D1 is connected with the anode of the polarized capacitor E1, one end of capacitor C1 and the input pin of voltage-stablizer U1 respectively
It connects, the positive and negative anodes of the polarized capacitor E1 and the other end of capacitor C1 are grounded respectively, the output end difference of the voltage-stablizer U1
It is connected with the anode of hot end, one end of capacitor C2 and polarized capacitor E2, the other end and polarized of the capacitor C2
The cathode of capacitor E2 is grounded respectively.Wherein, afterflow function when polarized capacitor E1 is for serial communication, diode D1 is for hindering
Only the electric energy of polarized capacitor E1 is discharged by power supply line, to guarantee that the power supply of the line traffic control plate circuit in the low level of communication is steady
It is qualitative.
In Fig. 2, first control module 1 and second control module 4 are all made of single-chip microcontroller（MCU）It realizes,
In practical application, it can also be realized by other control processors；In Fig. 2, first serial CN1, second serial is
CN2。
This example is based on DC power supply power supply line and carries out data transmission, wherein the master control borad circuit and line traffic control plate circuit
Respectively by the load of the transmitting pulse timesharing of serial communication on the power supply line of cable, the receiving end of the serial communication passes through inspection
Level on the power supply line of survey line cable just receives signal, when the first serial of master control borad circuit emits signal, the line
The second serial for controlling plate circuit receives signal；When the second serial of line traffic control plate circuit emits signal, the master control borad circuit
First serial receives signal, and therefore, this example, which only only used both threads cable and just reach, to be not only able to achieve serial communication but also can be line
The purpose of plate circuit power supply is controlled, and then has saved the cost of two root long cables, while without battery power supply, reducing circuit
The difficulty and maintenance cost of design reduce pollution of the battery to environment, and also realize communication by the serial ports of standard, convenient for soft
Part debugging docking need to only carry out configuration before realizing serial communication.
Embodiment 2：
This example also provides a kind of serial port communication method of direct current carrier, applied to direct current carrier as described in Example 1
Serial communication device, and include the following steps：
Step S1 realizes serial communication by the power supply line low and high level of controlling cable；
Step S2, the drive end by line traffic control plate circuit as serial communication issue request signal；Master control borad circuit is examined in real time
Request signal is surveyed, feedback signal completes serial communication after detecting request signal；
Step S3, when transmitting signal, if having pole in the current rectifying and wave filtering circuit 5 of line traffic control plate circuit between low period
Property capacitor E1 be line traffic control plate circuit power supply afterflow；If power supply line is the polarized electricity of current rectifying and wave filtering circuit 5 between high period
Hold E1 charging；In no transmission signal, power supply line normally provides stable 12V level.
The line traffic control plate circuit is the drive end of serial communication, actively issues signal, issues request signal；Master control borad circuit
For Partner, the request signal of line traffic control plate is received, feedback signal gives line traffic control plate circuit after response, and it is total that serial ports thus may be implemented
The occupancy and release of line；Serial port corresponding to the power supply line low and high level can be matched according to the demand of user
It sets.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (6)
1. a kind of serial communication device of direct current carrier, which is characterized in that including：Master control borad circuit and line traffic control plate circuit, it is described
It is attached between the first serial of master control borad circuit and the second serial of line traffic control plate circuit by both threads cable, wherein described
Master control borad circuit and line traffic control plate circuit are described respectively by the load of the transmitting pulse timesharing of serial communication on the power supply line of cable
Level on power supply line of the receiving end of serial communication by detecting cable just receives signal, when the first of master control borad circuit
When serial ports emits signal, the second serial of the line traffic control plate circuit receives signal；When the second serial of line traffic control plate circuit emits letter
Number when, the first serial of the master control borad circuit receives signal；The master control borad circuit is arranged promising line traffic control plate circuit and provides electricity
The constant-current source circuit in source, the supply voltage and constant current source current of the constant-current source circuit are determined by the power consumption of the line traffic control plate circuit
It is fixed；
The master control borad circuit includes the first control module and the first logic control circuit, first control module and constant-current source
Circuit is connected with first logic control circuit respectively；The line traffic control plate circuit includes the second control module, rectifying and wave-filtering
Circuit and the second logic control circuit, second control module and current rectifying and wave filtering circuit are electric with second logic control respectively
Road is connected；
Second logic control circuit include resistance R13, resistance R15, capacitor C7, triode T6, capacitor R10, triode T5,
Resistance R12, resistance R8, resistance R5 and resistance R6, the second serial respectively with one end of the resistance R13, triode T6
Collector and the single-chip microcontroller of the second control module are connected, the other end of resistance R13 one end with the resistance R15 respectively
It is connected with one end of capacitor C7, the other end of the resistance R15 and the other end of capacitor C7 are grounded respectively, the triode T6
Emitter ground connection, the base stage of the triode T6 is respectively connected to one end and the triode of the resistance R12 by resistance R10
The collector of T5, the emitter of the triode T5 are connected to hot end, and the base stage of the triode T5 is connected by resistance R8
It is connected to one end of resistance R5, the other end of the resistance R5 is connected with one end of hot end and resistance R6 respectively, the electricity
The other end of resistance R6 is connected to the single-chip microcontroller of second control module；
The current rectifying and wave filtering circuit includes diode D1, polarized capacitor E1, capacitor C1, voltage-stablizer U1, capacitor C2 and polarized
Capacitor E2, the anode of the diode D1 are connected with the collector of the triode T6, the cathode difference of the diode D1
It is connected with the anode of the polarized capacitor E1, one end of capacitor C1 and the input pin of voltage-stablizer U1, the polarized electricity
The positive and negative anodes and the other end of capacitor C1 for holding E1 are grounded respectively, the output end of the voltage-stablizer U1 respectively with hot end, capacitor
One end of C2 is connected with the anode of polarized capacitor E2, the other end of the capacitor C2 and the cathode difference of polarized capacitor E2
Ground connection.
2. the serial communication device of direct current carrier according to claim 1, which is characterized in that the perseverance of the constant-current source circuit
Stream source voltage is 12V, and constant current source current is 50~100mA.
3. the serial communication device of direct current carrier according to claim 1, which is characterized in that the constant-current source circuit includes
Triode T1, resistance R1, triode T2 and resistance R3, the emitter of the triode T1 and one end of resistance R1 are connected to power supply
End, the base stage of the triode T1 and the other end of resistance R1 are connected with the emitter of the triode T2 respectively, and described three
The collector of pole pipe T1 and the base stage of triode T2 pass through resistance R3 respectively and are grounded, the collector of the triode T2 and described the
One logic control circuit is connected.
4. the serial communication device of direct current carrier according to claim 3, which is characterized in that the first logic control electricity
Road includes resistance R2, resistance R4, triode T3, resistance R9, resistance R7, triode T4, resistance R11, resistance R14 and capacitor C6,
One end of the resistance R2 and the emitter of triode T3 are respectively connected to hot end, and the other end of the resistance R2 is connected to
The emission control pin of the single-chip microcontroller of first control module, the base stage of the triode T3 are connected to described by resistance R4
The collector of the emission control pin of the single-chip microcontroller of first control module, the triode T3 is respectively connected to one end of resistance R9
It being grounded with the other end of one end of resistance R7, the resistance R9, the other end of the resistance R7 is connected to the base stage of triode T4,
The collector of the triode T4 is connected with one end of first serial and resistance R11 respectively, the emitter of the triode T4
Ground connection, the other end of the resistance R11 respectively with one end of the resistance R14, one end of capacitor C6 and the first control module
The reception control pin of single-chip microcontroller is connected, and the other end of the resistance R14 and the other end of capacitor C6 are grounded respectively.
5. the serial communication device of direct current carrier according to claim 4, which is characterized in that the first control module further includes
Capacitor C3, capacitor C4 and capacitor C5, the power pin of the single-chip microcontroller of first control module pass through capacitor C3, capacitor C4 respectively
It is grounded with capacitor C5.
6. a kind of serial port communication method of direct current carrier, which is characterized in that be applied to as described in claim 1 to 5 any one
Direct current carrier serial communication device, and include the following steps：
Step S1 realizes serial communication by the power supply line low and high level of controlling cable；
Step S2, the drive end by line traffic control plate circuit as serial communication issue request signal；Master control borad circuit real-time detection is asked
Signal is sought, feedback signal completes serial communication after detecting request signal；
Step S3, when transmitting signal, if the current rectifying and wave filtering circuit 5 of line traffic control plate circuit is line traffic control plate circuit between low period
Power supply afterflow；If power supply line is the charging of current rectifying and wave filtering circuit 5 between high period；In no transmission signal, power supply line is just
Stable 12V level is often provided.
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| CN102324952A (en) * | 2011-09-30 | 2012-01-18 | 深圳麦克维尔空调有限公司 | Non-polar two-line system communication circuit |
| CN204334632U (en) * | 2014-12-22 | 2015-05-13 | 广东美的制冷设备有限公司 | A kind of master-slave communication circuit and air conditioner |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060046766A1 (en) * | 2004-09-01 | 2006-03-02 | Abet Technologies, Llc | Method and system for bidirectional communications and power transmission |
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- 2015-12-29 CN CN201511017117.1A patent/CN105404213B/en active Active
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|---|---|---|---|---|
| US4884287A (en) * | 1988-04-01 | 1989-11-28 | Ncr Corporation | Converter device for interconnecting systems having different communication standards |
| CN2817222Y (en) * | 2005-06-28 | 2006-09-13 | 浙江达峰科技有限公司 | Double wire stepless communication circuit |
| CN101806487A (en) * | 2010-03-12 | 2010-08-18 | 江苏蓝深远望系统集成有限公司 | Two-wire power supply communication circuit of air conditioner controllers |
| CN202025203U (en) * | 2011-04-03 | 2011-11-02 | 曼瑞德自控系统（乐清）有限公司 | Feeding type communication circuit |
| CN102324952A (en) * | 2011-09-30 | 2012-01-18 | 深圳麦克维尔空调有限公司 | Non-polar two-line system communication circuit |
| CN204334632U (en) * | 2014-12-22 | 2015-05-13 | 广东美的制冷设备有限公司 | A kind of master-slave communication circuit and air conditioner |
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| CN105404213A (en) | 2016-03-16 |
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