CN105404213A - Direct current carrier wave serial port communication apparatus and method - Google Patents
Direct current carrier wave serial port communication apparatus and method Download PDFInfo
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- CN105404213A CN105404213A CN201511017117.1A CN201511017117A CN105404213A CN 105404213 A CN105404213 A CN 105404213A CN 201511017117 A CN201511017117 A CN 201511017117A CN 105404213 A CN105404213 A CN 105404213A
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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
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Abstract
The invention provides a direct current carrier wave serial port communication apparatus and method. The serial port communication apparatus includes a master control board circuit and a line control board circuit, the first serial port of the master control board circuit and the second serial port of the line control board circuit are connected through two cables, the master control board circuit and the line control board circuit load the emission pulse communicated via the serial ports to the power lines of the cables in a time sharing manner, and the receiving end communicated via the serial ports receives signals by detecting the level on the power lines of the cables. When the first serial port of the master control board circuit transmits signals, the second serial port of the line control board circuit receives the signals, and when the second serial port of the line control board circuit transmits signals, the first serial port of the master control board circuit receives the signals. The aims of serial port communication and power supply for the line control board circuit are achieved through the two cables, and the cost of the two long cable is reduced, and meanwhile, battery power supply is not needed, and the circuit design difficulty and the maintenance cost are reduced.
Description
Technical field
The present invention relates to a kind of serial communication device, particularly relate to a kind of serial communication device of direct current carrier, and relate to the method for the serial communication device being applied to this direct current carrier.
Background technology
For line control machine exploitation, need to realize power supply and communication function, and the length of cable needed all wants more than 5 meters simultaneously; In this design, often power supply and communication are separated, need 2 cables be used for cable power supply or adopt powered battery, 2 cables carry out communication, like this just need 4 longer cables altogether, like this cable cost is very high, and the price of its 485 scheme is also higher; And adopting powered battery mode, electric power management circuit is very complicated, and frequent replacing is very serious to the pollution of environment.
Summary of the invention
Technical matters to be solved by this invention be need to provide a kind of can be cost-saving and reduce the serial communication device of the direct current carrier of development difficulty, and provide the method for the serial communication device being applied to this direct current carrier.
To this, the invention provides a kind of serial communication device of direct current carrier, comprise: master control borad circuit and line traffic control plate circuit, connected by two cables between the first serial of described master control borad circuit and the second serial of line traffic control plate circuit, wherein, described master control borad circuit and line traffic control plate circuit are carried on the power lead of cable respectively by the transponder pulse timesharing of serial communication, the receiving end of described serial communication carrys out Received signal strength by the level height detected on the power lead of cable, when the first serial of master control borad circuit transmits, the second serial Received signal strength of described line traffic control plate circuit, when the second serial of line traffic control plate circuit transmits, the first serial Received signal strength of described master control borad circuit.
Further improvement of the present invention is, described master control borad circuit comprises the first control module, constant-current source circuit and the first logic control circuit, and described first control module and constant-current source circuit are connected with described first logic control circuit respectively.
Further improvement of the present invention is, described line traffic control plate circuit comprises the second control module, current rectifying and wave filtering circuit and the second logic control circuit, and described second control module and current rectifying and wave filtering circuit are connected with described second logic control circuit respectively.
Further improvement of the present invention is, the constant current source voltage of described constant-current source circuit is 12V, and constant current source electric current is 50 ~ 100mA.In actual applications, constant current source voltage and current can be changed according to the design requirement of reality, and constant current source electric current sets by the value changing resistance R1 in circuit, and the constant current source electric current of preferred settings is less than 100mA.
Further improvement of the present invention is, described constant-current source circuit comprises triode T1, resistance R1, triode T2 and resistance R3, the emitter of described triode T1 and one end of resistance R1 are connected to power end, the base stage of described triode T1 is connected with the emitter of described triode T2 respectively with the other end of resistance R1, the collector of described triode T1 and the base stage of triode T2 are respectively by resistance R3 ground connection, and the collector of described triode T2 is connected with described first logic control circuit.Wherein, described resistance R1 is for setting the constant current source size of current of constant-current source circuit.
Further improvement of the present invention is, described first logic control circuit comprises resistance R2, resistance R4, triode T3, resistance R9, resistance R7, triode T4, resistance R11, resistance R14 and electric capacity C6, one end of described resistance R2 and the emitter of triode T3 are connected to hot end respectively, the other end of described resistance R2 is connected to the emission control pin of the single-chip microcomputer of described first control module, the base stage of described triode T3 is connected to the emission control pin of the single-chip microcomputer of described first control module by resistance R4, the collector of described triode T3 is connected to one end of resistance R9 and one end of resistance R7 respectively, the other end ground connection of described resistance R9, the other end of described resistance R7 is connected to the base stage of triode T4, the collector of described triode T4 is connected with first serial one end with resistance R11 respectively, the grounded emitter of described triode T4, the other end of described resistance R11 respectively with one end of described resistance R14, one end of electric capacity C6 and the reception of the single-chip microcomputer of the first control module control pin and are connected, the other end of described resistance R14 and the other end of electric capacity C6 ground connection respectively.
Further improvement of the present invention is, the first control module also comprises electric capacity C3, electric capacity C4 and electric capacity C5, and the power pin of the single-chip microcomputer of described first control module is respectively by electric capacity C3, electric capacity C4 and electric capacity C5 ground connection.
Further improvement of the present invention is, described second logic control circuit comprises resistance R13, resistance R15, electric capacity C7, triode T6, electric capacity R10, triode T5, resistance R12, resistance R8, resistance R5 and resistance R6, described second serial respectively with one end of described resistance R13, the collector of triode T6 is connected with the single-chip microcomputer of the second control module, the other end of described resistance R13 is connected with one end of electric capacity C7 with one end of described resistance R15 respectively, the other end of described resistance R15 and the other end of electric capacity C7 ground connection respectively, the grounded emitter of described triode T6, the base stage of described triode T6 is connected to one end of described resistance R12 and the collector of triode T5 respectively by resistance R10, the emitter of described triode T5 is connected to hot end, the base stage of described triode T5 is connected to one end of resistance R5 by resistance R8, the other end of described resistance R5 is connected with hot end one end with resistance R6 respectively, the other end of described resistance R6 is connected to the single-chip microcomputer of described second control module.
Further improvement of the present invention is, described current rectifying and wave filtering circuit comprises diode D1, there is polar capacitor E1, electric capacity C1, voltage stabilizer U1, electric capacity C2 and have polar capacitor E2, the anode of described diode D1 is connected with the collector of described triode T6, the negative electrode of described diode D1 respectively with the described positive pole having polar capacitor E1, one end of electric capacity C1 is connected with the input pin of voltage stabilizer U1, described have the both positive and negative polarity of polar capacitor E1 and the other end ground connection respectively of electric capacity C1, the output terminal of described voltage stabilizer U1 respectively with hot end, one end of electric capacity C2 with have the positive pole of polar capacitor E2 and be connected, the other end and the negative pole ground connection respectively having polar capacitor E2 of described electric capacity C2.Wherein, have polar capacitor E1 for afterflow function during serial communication, diode D1 has the electric energy of polar capacitor E1 to be discharged by power lead for stoping, thus ensures the power good of the line traffic control plate circuit when the low level of communication.
The present invention also provides a kind of serial port communication method of direct current carrier, is applied to the serial communication device of direct current carrier as above, and comprises the following steps:
Step S1, realizes serial communication by the power lead low and high level controlling cable;
Step S2, by line traffic control plate circuit as the drive end of serial communication, sends request signal; Master control borad circuit detects request signal in real time, until after request signal being detected feedback signal to complete serial communication;
Step S3, when signal transmission, if between low period, the polar capacitor E1 that has in the current rectifying and wave filtering circuit 5 of line traffic control plate circuit is the power supply afterflow of line traffic control plate circuit; If between high period, power lead is that the polar capacitor E1 that has of current rectifying and wave filtering circuit 5 charges; When not having signal transmission, power lead normally provides stable 12V level.
Described line traffic control plate circuit is the drive end of serial communication, initiatively sends signal, sends request signal; Master control borad circuit is Partner, receives the request signal of line traffic control plate, feeds back signal to line traffic control plate circuit, so just can realize taking and discharging of serial bus after response; Serial port corresponding to described power lead low and high level can be configured according to the demand of user.
Compared with prior art, beneficial effect of the present invention is: carry out data transmission based on DC power supply circuit, wherein, described master control borad circuit and line traffic control plate circuit are carried on the power lead of cable respectively by the transponder pulse timesharing of serial communication, the receiving end of described serial communication carrys out Received signal strength by the level height detected on the power lead of cable, when the first serial of master control borad circuit transmits, the second serial Received signal strength of described line traffic control plate circuit; When the second serial of line traffic control plate circuit transmits, the first serial Received signal strength of described master control borad circuit, therefore, the present invention only only used two cables and just reaches the object that can realize serial communication and can power for line traffic control plate circuit again, and then has saved the cost of two long cables, simultaneously without the need to adopting powered battery, reduce difficulty and the maintenance cost of circuit design, reduce battery to the pollution of environment, and realize communication by the serial ports of standard, be convenient to software debugging docking.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram of an embodiment of the present invention;
Fig. 2 is the circuit theory diagrams of an embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, preferably embodiment of the present 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, comprise: master control borad circuit and line traffic control plate circuit, connected by two cables between the first serial of described master control borad circuit and the second serial of line traffic control plate circuit, wherein, described master control borad circuit and line traffic control plate circuit are carried on the power lead of cable respectively by the transponder pulse timesharing of serial communication, the receiving end of described serial communication carrys out Received signal strength by the level height detected on the power lead of cable, when the first serial of master control borad circuit transmits, the second serial Received signal strength of described line traffic control plate circuit, when the second serial of line traffic control plate circuit transmits, the first serial Received signal strength of described master control borad circuit.
This routine described master control borad circuit comprises the first control module 1, constant-current source circuit 2 and the first logic control circuit 3, and described first control module 1 and constant-current source circuit 2 are connected with described first logic control circuit 3 respectively.Described line traffic control plate circuit comprises the second control module 4, current rectifying and wave filtering circuit 5 and the second logic control circuit 6, and described second control module 4 and current rectifying and wave filtering circuit 5 are connected with described second logic control circuit 6 respectively.
This routine described master control borad circuit arranges the constant-current source circuit 2 that promising line traffic control plate circuit provides power supply, the supply voltage of described constant-current source circuit 2 and constant current source electric current will determine according to the power consumption of line traffic control plate circuit, the power consumption meeting < 3.3V50 ~ 100mA of usual line traffic control plate circuit, so the constant current source voltage of this routine described constant-current source circuit 2 is preferably 12V, constant current source electric current is preferably defined as 50 ~ 100mA; In actual applications, constant current source voltage and current can be changed according to the design requirement of reality, and constant current source electric current sets by the value changing resistance R1 in circuit, and the constant current source electric current of preferred settings is less than 100mA.Baud rate recommendation 4800 and 9,600 two kinds of baud rates of serial communication between described first serial and second serial, and all adopt the serial ports of standard to realize communication.Described cable is the long cable of more than 5 meters, is preferably the long cable of≤10 meters, because when cable is long, because the parasitic character of cable itself is obvious all the more, may cause communication abnormality; Described two cables of this example comprise power and ground, and described master control borad circuit and line traffic control plate circuit are carried on the power lead of cable respectively by the transponder pulse timesharing of serial communication, are namely realized the function of power supply and timesharing serial communication by power lead.
In the line control machine exploitation of prior art, the electric current that line control machine needs usually is also less, and only less than 100mA, realize power supply and communication according to 4 long cables, the cost of its cable will remain high; Two change an angle, and power according to battery, the hardware cost of this design is high, and circuit is complicated, contaminated environment.And in this example, just both can realize by two cables the communication function not only powering but also realize serial mode.
As shown in Figure 2, this routine described constant-current source circuit 2 comprises triode T1, resistance R1, triode T2 and resistance R3, the emitter of described triode T1 and one end of resistance R1 are connected to power end, the base stage of described triode T1 is connected with the emitter of described triode T2 respectively with the other end of resistance R1, the collector of described triode T1 and the base stage of triode T2 are respectively by resistance R3 ground connection, and the collector of described triode T2 is connected with described first logic control circuit 3.First control module 1 also comprises electric capacity C3, electric capacity C4 and electric capacity C5, and the power pin of the single-chip microcomputer of described first control module 1 is respectively by electric capacity C3, electric capacity C4 and electric capacity C5 ground connection.Wherein, described resistance R1 is for setting the constant current source size of current of constant-current source circuit.
As shown in Figure 2, described first logic control circuit 3 comprises resistance R2, resistance R4, triode T3, resistance R9, resistance R7, triode T4, resistance R11, resistance R14 and electric capacity C6, one end of described resistance R2 and the emitter of triode T3 are connected to hot end respectively, the other end of described resistance R2 is connected to the emission control pin of the single-chip microcomputer of described first control module 1, the base stage of described triode T3 is connected to the emission control pin of the single-chip microcomputer of described first control module 1 by resistance R4, the collector of described triode T3 is connected to one end of resistance R9 and one end of resistance R7 respectively, the other end ground connection of described resistance R9, the other end of described resistance R7 is connected to the base stage of triode T4, the collector of described triode T4 is connected with first serial one end with resistance R11 respectively, the grounded emitter of described triode T4, the other end of described resistance R11 respectively with one end of described resistance R14, one end of electric capacity C6 and the reception of the single-chip microcomputer of the first control module 1 control pin and are connected, the other end of described resistance R14 and the other end of electric capacity C6 ground connection respectively.
As shown in Figure 2, described second logic control circuit 6 comprises resistance R13, resistance R15, electric capacity C7, triode T6, electric capacity R10, triode T5, resistance R12, resistance R8, resistance R5 and resistance R6, described second serial respectively with one end of described resistance R13, the collector of triode T6 is connected with the single-chip microcomputer of the second control module 4, the other end of described resistance R13 is connected with one end of electric capacity C7 with one end of described resistance R15 respectively, the other end of described resistance R15 and the other end of electric capacity C7 ground connection respectively, the grounded emitter of described triode T6, the base stage of described triode T6 is connected to one end of described resistance R12 and the collector of triode T5 respectively by resistance R10, the emitter of described triode T5 is connected to hot end, the base stage of described triode T5 is connected to one end of resistance R5 by resistance R8, the other end of described resistance R5 is connected with hot end one end with resistance R6 respectively, the other end of described resistance R6 is connected to the single-chip microcomputer of described second control module 4.
As shown in Figure 2, described current rectifying and wave filtering circuit 5 comprises diode D1, there is polar capacitor E1, electric capacity C1, voltage stabilizer U1, electric capacity C2 and have polar capacitor E2, the anode of described diode D1 is connected with the collector of described triode T6, the negative electrode of described diode D1 respectively with the described positive pole having polar capacitor E1, one end of electric capacity C1 is connected with the input pin of voltage stabilizer U1, described have the both positive and negative polarity of polar capacitor E1 and the other end ground connection respectively of electric capacity C1, the output terminal of described voltage stabilizer U1 respectively with hot end, one end of electric capacity C2 with have the positive pole of polar capacitor E2 and be connected, the other end and the negative pole ground connection respectively having polar capacitor E2 of described electric capacity C2.Wherein, have polar capacitor E1 for afterflow function during serial communication, diode D1 has the electric energy of polar capacitor E1 to be discharged by power lead for stoping, thus ensures the power good of the line traffic control plate circuit when the low level of communication.
In Fig. 2, described first control module 1 and described second control module 4 all adopt single-chip microcomputer (MCU) to realize, and in actual applications, also can be realized by other control processor; In Fig. 2, first serial is CN1, and second serial is CN2.
This example carries out data transmission based on DC power supply circuit, wherein, described master control borad circuit and line traffic control plate circuit are carried on the power lead of cable respectively by the transponder pulse timesharing of serial communication, the receiving end of described serial communication carrys out Received signal strength by the level height detected on the power lead of cable, when the first serial of master control borad circuit transmits, the second serial Received signal strength of described line traffic control plate circuit; When the second serial of line traffic control plate circuit transmits, the first serial Received signal strength of described master control borad circuit, therefore, this example only only used two cables and just reaches the object that can realize serial communication and can power for line traffic control plate circuit again, and then saved the cost of two long cables, simultaneously without the need to adopting powered battery, reduce difficulty and the maintenance cost of circuit design, reduce battery to the pollution of environment, and realize communication by the serial ports of standard, be convenient to software debugging docking, before realizing serial communication, only need carry out and configure.
Embodiment 2:
This example also provides a kind of serial port communication method of direct current carrier, is applied to the serial communication device of direct current carrier as described in Example 1, and comprises the following steps:
Step S1, realizes serial communication by the power lead low and high level controlling cable;
Step S2, by line traffic control plate circuit as the drive end of serial communication, sends request signal; Master control borad circuit detects request signal in real time, until after request signal being detected feedback signal to complete serial communication;
Step S3, when signal transmission, if between low period, the polar capacitor E1 that has in the current rectifying and wave filtering circuit 5 of line traffic control plate circuit is the power supply afterflow of line traffic control plate circuit; If between high period, power lead is that the polar capacitor E1 that has of current rectifying and wave filtering circuit 5 charges; When not having signal transmission, power lead normally provides stable 12V level.
Described line traffic control plate circuit is the drive end of serial communication, initiatively sends signal, sends request signal; Master control borad circuit is Partner, receives the request signal of line traffic control plate, feeds back signal to line traffic control plate circuit, so just can realize taking and discharging of serial bus after response; Serial port corresponding to described power lead low and high level can be configured according to the demand of user.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. the serial communication device of a direct current carrier, it is characterized in that, comprise: master control borad circuit and line traffic control plate circuit, connected by two cables between the first serial of described master control borad circuit and the second serial of line traffic control plate circuit, wherein, described master control borad circuit and line traffic control plate circuit are carried on the power lead of cable respectively by the transponder pulse timesharing of serial communication, the receiving end of described serial communication carrys out Received signal strength by the level height detected on the power lead of cable, when the first serial of master control borad circuit transmits, the second serial Received signal strength of described line traffic control plate circuit, when the second serial of line traffic control plate circuit transmits, the first serial Received signal strength of described master control borad circuit.
2. the serial communication device of direct current carrier according to claim 1, it is characterized in that, described master control borad circuit comprises the first control module, constant-current source circuit and the first logic control circuit, and described first control module and constant-current source circuit are connected with described first logic control circuit respectively.
3. the serial communication device of direct current carrier according to claim 2, it is characterized in that, described line traffic control plate circuit comprises the second control module, current rectifying and wave filtering circuit and the second logic control circuit, and described second control module and current rectifying and wave filtering circuit are connected with described second logic control circuit respectively.
4. the serial communication device of direct current carrier according to claim 3, is characterized in that, the constant current source voltage of described constant-current source circuit is 12V, and constant current source electric current is 50 ~ 100mA.
5. the serial communication device of the direct current carrier according to claims 1 to 3 any one, it is characterized in that, described constant-current source circuit comprises triode T1, resistance R1, triode T2 and resistance R3, the emitter of described triode T1 and one end of resistance R1 are connected to power end, the base stage of described triode T1 is connected with the emitter of described triode T2 respectively with the other end of resistance R1, the collector of described triode T1 and the base stage of triode T2 are respectively by resistance R3 ground connection, and the collector of described triode T2 is connected with described first logic control circuit.
6. the serial communication device of direct current carrier according to claim 5, it is characterized in that, described first logic control circuit comprises resistance R2, resistance R4, triode T3, resistance R9, resistance R7, triode T4, resistance R11, resistance R14 and electric capacity C6, one end of described resistance R2 and the emitter of triode T3 are connected to hot end respectively, the other end of described resistance R2 is connected to the emission control pin of the single-chip microcomputer of described first control module, the base stage of described triode T3 is connected to the emission control pin of the single-chip microcomputer of described first control module by resistance R4, the collector of described triode T3 is connected to one end of resistance R9 and one end of resistance R7 respectively, the other end ground connection of described resistance R9, the other end of described resistance R7 is connected to the base stage of triode T4, the collector of described triode T4 is connected with first serial one end with resistance R11 respectively, the grounded emitter of described triode T4, the other end of described resistance R11 respectively with one end of described resistance R14, one end of electric capacity C6 and the reception of the single-chip microcomputer of the first control module control pin and are connected, the other end of described resistance R14 and the other end of electric capacity C6 ground connection respectively.
7. the serial communication device of direct current carrier according to claim 6, it is characterized in that, first control module also comprises electric capacity C3, electric capacity C4 and electric capacity C5, and the power pin of the single-chip microcomputer of described first control module is respectively by electric capacity C3, electric capacity C4 and electric capacity C5 ground connection.
8. the serial communication device of the direct current carrier according to claim 3 or 4, it is characterized in that, described second logic control circuit comprises resistance R13, resistance R15, electric capacity C7, triode T6, electric capacity R10, triode T5, resistance R12, resistance R8, resistance R5 and resistance R6, described second serial respectively with one end of described resistance R13, the collector of triode T6 is connected with the single-chip microcomputer of the second control module, the other end of described resistance R13 is connected with one end of electric capacity C7 with one end of described resistance R15 respectively, the other end of described resistance R15 and the other end of electric capacity C7 ground connection respectively, the grounded emitter of described triode T6, the base stage of described triode T6 is connected to one end of described resistance R12 and the collector of triode T5 respectively by resistance R10, the emitter of described triode T5 is connected to hot end, the base stage of described triode T5 is connected to one end of resistance R5 by resistance R8, the other end of described resistance R5 is connected with hot end one end with resistance R6 respectively, the other end of described resistance R6 is connected to the single-chip microcomputer of described second control module.
9. the serial communication device of direct current carrier according to claim 8, it is characterized in that, described current rectifying and wave filtering circuit comprises diode D1, there is polar capacitor E1, electric capacity C1, voltage stabilizer U1, electric capacity C2 and have polar capacitor E2, the anode of described diode D1 is connected with the collector of described triode T6, the negative electrode of described diode D1 respectively with the described positive pole having polar capacitor E1, one end of electric capacity C1 is connected with the input pin of voltage stabilizer U1, described have the both positive and negative polarity of polar capacitor E1 and the other end ground connection respectively of electric capacity C1, the output terminal of described voltage stabilizer U1 respectively with hot end, one end of electric capacity C2 with have the positive pole of polar capacitor E2 and be connected, the other end and the negative pole ground connection respectively having polar capacitor E2 of described electric capacity C2.
10. a serial port communication method for direct current carrier, is characterized in that, is applied to the serial communication device of the direct current carrier as described in claim 1 to 9 any one, and comprises the following steps:
Step S1, realizes serial communication by the power lead low and high level controlling cable;
Step S2, by line traffic control plate circuit as the drive end of serial communication, sends request signal; Master control borad circuit detects request signal in real time, until after request signal being detected feedback signal to complete serial communication;
Step S3, when signal transmission, if between low period, the current rectifying and wave filtering circuit 5 of line traffic control plate circuit is the power supply afterflow of line traffic control plate circuit; If between high period, power lead is that current rectifying and wave filtering circuit 5 charges; When not having signal transmission, power lead normally provides stable 12V level.
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| CN108036518A (en) * | 2018-01-02 | 2018-05-15 | 成都前锋电子有限责任公司 | A kind of expansible communication system of gas instantaneous water heater compatibility |
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|---|---|
| CN105404213B (en) | 2018-11-16 |
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