CN210780845U - Master-slave machine communication circuit and communication device - Google Patents
Master-slave machine communication circuit and communication device Download PDFInfo
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- CN210780845U CN210780845U CN201921396314.2U CN201921396314U CN210780845U CN 210780845 U CN210780845 U CN 210780845U CN 201921396314 U CN201921396314 U CN 201921396314U CN 210780845 U CN210780845 U CN 210780845U
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Abstract
The utility model belongs to the technical field of the electronic circuit, a master slaver communication circuit and communication device are provided, this master slaver communication circuit is including sharing the module, host computer module and from the module, the control signal to the host system output is kept apart through sharing the module and is handled, and the host computer module adopts the mode of voltage modulation to send first data signal to outside slave machine equipment according to control signal, so that outside slave machine equipment feedback second data signal, and from the module according to control signal, respond when receiving the third data signal that outside host machine equipment sent, and adopt the mode of current modulation to send fourth data signal to outside host machine equipment. Therefore, the host module and the shared module form a host, the slave module and the shared module form a slave, and the shared module is commonly used, so that the space of a printed circuit board is saved, and the cost is saved; and the device has the functions of serving as a host and a slave, can meet the requirements of different customers, and improves the communication efficiency.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit, especially, relate to a principal and subordinate machine communication circuit and communication device.
Background
The M-Bus is a network system structure which is specially used for remote reading or relevant information reading of various meters or devices. The European meter reading bus standard adopting remote reading is widely applied to remote meter reading systems of departments of water, electricity, gas and the like, and the bus plays an extremely important role in building automation career and related applications.
However, the existing communication technology has the problems that the product is not just a host computer or a slave computer, the requirement of a user cannot be met, and the communication efficiency is low.
SUMMERY OF THE UTILITY MODEL
The object of the present invention is to provide a master-slave communication circuit and a communication device, which can solve the problems of the prior art that the product is not the host or the slave, the requirement of the user can not be satisfied, and the communication efficiency is low.
The utility model discloses the first aspect provides a principal and subordinate machine communication circuit, is applied to the electric energy meter in, the principal and subordinate machine communication circuit includes:
the sharing module is connected with the main control module and is used for carrying out isolation processing on the control signals output by the main control module;
the host module is connected with the shared module and used for sending a first data signal to external slave equipment in a voltage modulation mode according to the control signal so as to enable the external slave equipment to feed back a second data signal; and
the slave module is connected with the shared module and used for responding when receiving a third data signal sent by external host equipment according to the control signal and sending a fourth data signal to the external host equipment in a current modulation mode;
wherein, the external slave equipment and the external host equipment comprise an electric meter, a water meter or a gas meter.
The utility model discloses the second aspect provides a principal and subordinate machine communication device, include:
the master-slave machine communication circuit is described above; and
and the master control module is connected with the master-slave machine communication circuit and used for outputting control signals.
The utility model provides a pair of principal and subordinate machine communication circuit and communication device, this principal and subordinate machine communication circuit is including sharing the module, host computer module and from the module, the control signal of output to host system through sharing the module keeps apart the processing, and the host computer module adopts voltage modulation's mode to send first data signal to outside from the equipment according to control signal, so that outside from the equipment feedback second data signal, and from the module according to control signal, respond when receiving the third data signal that outside host computer equipment sent, and adopt current modulation's mode to send fourth data signal to outside host computer equipment. Therefore, the host module and the shared module form a host, the slave module and the shared module form a slave, and the shared module is commonly used, so that the space of a printed circuit board is saved, and the cost is saved; the device has the functions of a host and a slave, and can meet the requirements of different customers; the host and the slave adopt a mode of selecting according to requirements, so that the communication efficiency is greatly improved, and the problems that products are not the host or the slave, the requirements of users cannot be met and the communication efficiency is low in the existing communication technology are solved.
Drawings
Fig. 1 is a schematic diagram of a module structure of a communication circuit of a master-slave machine according to an embodiment of the present invention.
Fig. 2 is a circuit diagram illustrating an example of a shared module in a communication circuit of a master/slave device according to an embodiment of the present invention.
Fig. 3 is a circuit diagram illustrating an example of a host module in a communication circuit of a master/slave device according to an embodiment of the present invention.
Fig. 4 is a circuit diagram illustrating an example of a slave module in a master-slave communication circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The master-slave communication circuit comprises a shared module, a master module and a slave module, wherein the shared module is used for carrying out isolation processing on a control signal output by the master control module, the master module sends a first data signal to external slave equipment in a voltage modulation mode according to the control signal so as to enable the external slave equipment to feed back a second data signal, and the slave module responds when receiving a third data signal sent by the external master equipment according to the control signal and sends a fourth data signal to the external master equipment in a current modulation mode. Therefore, the host module and the shared module form a host, the slave module and the shared module form a slave, and the shared module is commonly used, so that the space of a printed circuit board is saved, and the cost is saved; the device has the functions of a host and a slave, and can meet the requirements of different customers; the host and the slave adopt a mode selected according to requirements, and communication efficiency is greatly improved.
Fig. 1 shows a module structure of a master-slave communication circuit according to an embodiment of the present invention, and for convenience of description, only the parts related to this embodiment are shown, and detailed descriptions are as follows:
the master-slave machine communication circuit is applied to the electric energy meter, and comprises a sharing module 103, a master machine module 101 and a slave machine module 102.
The common module 103 is connected to the main control module 104, and is configured to perform isolation processing on the control signal output by the main control module 104.
The host module 101 is connected to the common module 103, and configured to send a first data signal to an external slave device in a voltage modulation manner according to the control signal, so that the external slave device feeds back a second data signal.
The slave module 102 is connected to the common module 103, and configured to respond when receiving a third data signal sent by an external host device according to the control signal, and send a fourth data signal to the external host device in a current modulation manner.
Wherein, the external slave equipment and the external host equipment comprise an electric meter, a water meter or a gas meter.
As an embodiment of the present invention, the host module 101 and the common module 103 form a host, the slave module 102 and the common module 103 form a slave, and the common module 103 is commonly used, so that the space of the printed circuit board is saved, and the cost is saved; the master-slave machine communication circuit has the functions of a master machine and a slave machine, and can meet the requirements of different customers; the host and the slave adopt a mode selected according to requirements, and communication efficiency is greatly improved.
As an embodiment of the present invention, the electric energy meter operates in a voltage modulation mode when being used as an M-Bus master to send data to an M-Bus slave, and the M-Bus slave sends data to the M-Bus master to take a current modulation mode.
Voltage modulation mode: when the host does not send data, the default is high level '1', and the high level is: 12-42V, typical value is 36V, the system uses 36V, low level '0' is: a typical value is high minus 12V, but the level cannot be below 12V. Therefore, the level range on the bus is 12-42V.
The current modulation mode: the system adopts a half-duplex working mode, so when the slave machine sends data, the master machine does not send data and is fixed to be a high level, the slave machine sends a high level '1' and fixes the working current of the slave machine to be less than 1.5mA, the level on the bus is ensured not to fluctuate, when the slave machine sends a low level '0', at least 11mA working current is added under the original working current, the voltage of the bus is caused to send slight fluctuation, and the fluctuation is amplified by an operational amplifier, so that a low level logic signal is obtained.
As an embodiment of the present invention, the master module 101 and the slave module 102 are isolated from each other.
Fig. 2 shows an exemplary circuit of a common module in a master-slave communication circuit according to an embodiment of the present invention, and for convenience of description, only the parts related to this embodiment are shown, which are detailed as follows:
as an embodiment of the present invention, the above-mentioned sharing module 103 includes a first resistor R261, a second resistor R262, a third resistor R263, a fifth resistor R265, a sixth resistor R266, a seventh resistor R267, an eighth resistor R268, a ninth resistor R269, an eleventh resistor R281, a twelfth resistor R282, a thirteenth resistor R283, a sixteenth resistor R86, a twenty-first resistor R91, a first capacitor C131, a second capacitor C132, a fourth capacitor C134, a tenth capacitor C130, a third triode Q23, a fourth triode Q24, a first photocoupler U16 and a second photocoupler U17.
A first terminal of the sixth resistor R266, an input terminal of the photo-receiver of the second photo-coupler U17, and a first terminal of the first resistor R261 are connected to a first reference voltage (VCC 33 in fig. 2), a second terminal of the sixth resistor R266 is connected to a first terminal of the fourth capacitor C134 and a collector of the fourth transistor Q24, a base of the fourth transistor Q24 is connected to a first terminal of the seventh resistor R267 and a first terminal of the second capacitor C132, an emitter of the fourth transistor Q24 is connected to a first terminal of the eighth resistor R268, a second terminal of the seventh resistor R267, a second terminal of the second capacitor C132, a second terminal of the eighth resistor R268, and an output terminal of the photo-receiver of the second photo-coupler U17, a first terminal of the fourth resistor R264, a first terminal of the ninth resistor R269, and a first terminal of the eleventh resistor R281 are connected to a second reference voltage (+ 30V in fig. 2), a second terminal of an input terminal of the second photo-coupler U17 is connected to a light-emitting source of the second resistor R269, an output end of a light emitting source of the second photocoupler U17 is connected with the host computer module 101, a second end of the first resistor R261 is connected with an input end of a light emitting source of the first photocoupler U16, an output end of a light emitting source of the first photocoupler U16 is connected with a first end of the first capacitor C131, a second end of the first capacitor C131 is grounded, a second end of the fourth resistor R264 is connected with a first end of the fifth resistor R265 and an input end of a light receiver of the first photocoupler U16 in common, an output end of the light receiver of the first photocoupler U16, a first end of the tenth capacitor C130, a first end of the second resistor R262 and a first end of the third resistor R263 in common, a second end of the fifth resistor R265 is connected with a first end of the thirteenth resistor R283 and a collector of the third triode Q23, a second end of the eleventh resistor R281 is connected with a second end of the thirteenth resistor R283, a second end of the tenth capacitor C130, a second end of the second resistor R262, a second end of the twelfth resistor R262 and a base of the third triode Q23 of the third, the second end of the third resistor R263, the second end of the twelfth resistor R282, the first end of the sixteenth resistor R86, the first end of the twenty-first resistor R91 and the emitter of the third transistor Q23 are connected together, and the second end of the sixteenth resistor R86 is connected to the second end of the twenty-first resistor R91.
Fig. 3 shows an exemplary circuit of a host module in a master-slave communication circuit according to an embodiment of the present invention, which only shows the relevant parts of the present embodiment for convenience of description, and the detailed description is as follows:
as an embodiment of the present invention, the host module 101 includes a bus protection unit 1014, a charging control unit 1012, an operational amplifier unit 1011, and a current limiting unit 1013.
The bus protection unit 1014 is connected to a bus of the electric energy meter for protecting current and voltage flowing through the bus.
The charging control unit 1012 is connected to the bus protection unit 1014, and is configured to charge the electric energy meter.
The operational amplifier unit 1011 is connected to the common module 103, and configured to output an optimized signal after performing operational amplification on the control signal.
The current limiting unit 1013 is connected to the operational amplifier unit 1011 for limiting the optimized current.
As an embodiment of the present invention, the bus protection unit 1014 includes a fuse PPTC1, a twenty-third resistor R73, and a third transient suppression diode TVS 3.
A first terminal of the fuse PPTC1 and a first terminal of the twenty-third resistor R73 are connected to a bus of the electric energy meter, a second terminal of the fuse PPTC1 is connected to a first terminal of the third transient suppression diode TVS3, and a second terminal of the twenty-third resistor R73 is connected to a second terminal of the third transient suppression diode TVS 3.
As an embodiment of the present invention, the charging control unit 1012 includes a twenty-sixth resistor R146, a twenty-ninth resistor R149, a third capacitor C103, and a fourth diode D14.
An anode of the fourth diode D14 is connected to the bus protection unit 1014, a cathode of the fourth diode D14 is connected to a first end of a twenty-ninth resistor R149, a second end of the twenty-ninth resistor R149 is connected to a first end of a twenty-sixth resistor R146 and a first end of a third capacitor C103, and a second end of the twenty-sixth resistor R146 and a second end of the third capacitor C103 are grounded.
In an embodiment of the present invention, the current limiting unit 1013 includes a thirty-th resistor R130, a thirty-sixth resistor R136, a thirty-ninth resistor R139, and a fifty-first resistor R151.
The first end of the thirty-first resistor R130, the first end of the thirty-sixth resistor R136, the first end of the thirty-ninth resistor R139 and the first end of the fifty-first resistor R151 are connected to the operational amplifier unit 1011, and the second end of the thirty-first resistor R130, the second end of the thirty-sixth resistor R136, the second end of the thirty-ninth resistor R139 and the second end of the fifty-first resistor R151 are connected to the operational amplifier unit 1011.
As an embodiment of the present invention, the operational amplifier unit 1011 includes an operational amplifier or an existing operational amplifier circuit.
Fig. 4 shows an exemplary circuit of a slave module in a master-slave communication circuit according to an embodiment of the present invention, and for convenience of description, only the parts related to this embodiment are shown, which are detailed as follows:
as an embodiment of the present invention, the slave module 102 includes a transceiver 1021 and a protection unit 1022.
The transceiving unit 1021 is configured to receive the third data signal and transmit the fourth data signal.
The protection unit 1022 is connected to the bus of the transceiver 1021 and the electric energy meter, and is configured to protect the current and the voltage flowing through the bus.
As an embodiment of the present invention, the protection unit 1022 includes a seventh transient suppression diode TVS7, a fourth adjustable resistor RV4, an eighteenth resistor R88, a nineteenth resistor R89, and a seventeenth resistor R71.
The first end of the eighteenth resistor R88 and the first end of the fourth adjustable resistor RV4 are connected to the bus of the electric energy meter, the second end of the eighteenth resistor R88 is connected to the first end of the seventh transient suppression diode TVS7, the second end of the seventh transient suppression diode TVS7 is connected to the first end of the nineteenth resistor R89, the first end of the seventy-first resistor R71 is connected to the bus of the electric energy meter, and the second end of the seventy-first resistor R71 is connected to the second end of the fourth adjustable resistor RV4 and the second end of the nineteenth resistor R89.
As an embodiment of the present invention, the transceiver unit 1021 is implemented by a transceiver ic.
Specifically, the transceiver integrated chip is a transceiver integrated chip with model number TSS721A, which is a single chip transceiver meeting the instrument bus standard (EN1434-3), the internal interface circuit can adapt to different levels between a master and a slave in the instrument bus structure, the connection with the bus is nonpolar, and the optical coupler is supported to be completely electrically isolated from the slave.
The transceiver integrated chip may be bus powered, does not add power requirements to the slave, and has built-in bus voltage fault indication. The receiver has a dynamic level discrimination function and the transmitter has a programmable current sink. A3.3 v voltage stabilizing source is integrated on a chip, and when a bus fails, the bus is turned off in a delayed mode. The master-slave machine communication circuit can be widely applied to the fields of M-BUS remote meter reading, security, intelligent home and the like.
The advantages of the master-slave communication circuit are shown in the following aspects:
1. the method conforms to EN1434-3 communication standard;
2. the receiver has a dynamic level identification function;
3. the modulation current can be adjusted through the peripheral resistance;
4. an anti-polarity-reversal function;
5. an undervoltage indication function;
6. module power supply switching;
7. 3.3V voltage-stabilized power supply is integrated;
8. the bus is used for supplying power remotely;
9. a half-duplex UART communication rate of 9600 baud maximum;
10. support multiple slave machine power supply mode:
the power is supplied by the bus through a VDD end;
the power is supplied by the bus through a VDD end, and meanwhile, the battery is standby;
battery powered, the bus is used only for data transfer.
The utility model also provides a principal and subordinate machine communication device, include:
the master-slave machine communication circuit is described above; and
and the master control module is connected with the master-slave machine communication circuit and used for outputting control signals.
The operation principle of the master-slave communication circuit and the communication device is described with reference to fig. 1 to 4 as follows:
when the host module 101 sends the first data signal:
1. generation of low level: when the first photocoupler U16 receives a low level signal, the first photocoupler U16 is turned on, and then the third triode Q23 is turned on, and the collector voltage of the third triode Q23 is pulled low through the sixteenth resistor R86; the resistance values of the eleventh resistor R281 and the thirteenth resistor R283 are equal, so that after voltage division is performed through the eleventh resistor R281 and the twelfth resistor R282, the level of the inputA + network is half of the high level, and as the voltage is a follow-up design, the inputA + input voltage is equal to the output voltage of the first operational amplifier, that is, the output level of the first operational amplifier passing through the operational amplifier U30 is changed from 36V to 18V, and the M-Bus is distinguished as the low level;
2. generation of high level: when the first photoelectric coupler U16 receives a high level signal, the first photoelectric coupler U16 is not turned on, so the third triode Q23 is not turned on, the collector voltage of the third triode Q23 maintains a high voltage, i.e., the level of the inputA + network is high level, the first operational amplifier of the operational amplifier U30 outputs a high level of 36V, and the M-Bus is distinguished as high level.
The data code stream sent by the slave module 102 to the external host device is a current pulse sequence, and when the slave module 102 receives the third data signal:
1. and transmission logic 1: when a logic 1 is transmitted, 1.5mA current is used for transmission, the level of an input end inputB-of the second path of operational amplifier is low level, the second photoelectric coupler U17 is conducted, the fourth triode Q24 is conducted, the potential of a collector C of the fourth triode is pulled low, and low level is obtained;
2. transmission logic 0: when logic 0 is transmitted, the slave station increases the current value by 11-20 mA, the level of the input end inputB-of the second path of operational amplifier is high level, the second photoelectric coupler U17 is conducted, the fourth triode Q24 is not conducted, the potential of the collector C of the fourth triode is pulled high, and high level is obtained.
And, the slave module 102 uses a transceiver integrated chip with model number TSS721A to transmit and receive data signals.
To sum up, the embodiment of the utility model provides a pair of master slaver, this master slaver communication circuit includes sharing module, host computer module and from the module, the control signal to the host system output through sharing module keeps apart the processing, and host computer module adopts voltage modulation's mode to send first data signal to outside slave machine equipment according to control signal, so that outside slave machine equipment feedback second data signal, and from the module according to control signal, respond when receiving the third data signal that outside host machine equipment sent, and adopt current modulation's mode to send fourth data signal to outside host machine equipment. Therefore, the host module and the shared module form a host, the slave module and the shared module form a slave, and the shared module is commonly used, so that the space of a printed circuit board is saved, and the cost is saved; the device has the functions of a host and a slave, and can meet the requirements of different customers; the host and the slave adopt a mode of selecting according to requirements, so that the communication efficiency is greatly improved, and the problems that products are not the host or the slave, the requirements of users cannot be met and the communication efficiency is low in the existing communication technology are solved.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A master-slave machine communication circuit is applied to an electric energy meter, and is characterized in that the master-slave machine communication circuit comprises:
the sharing module is connected with the main control module and is used for carrying out isolation processing on the control signals output by the main control module;
the host module is connected with the shared module and used for sending a first data signal to external slave equipment in a voltage modulation mode according to the control signal so as to enable the external slave equipment to feed back a second data signal; and
the slave module is connected with the shared module and used for responding when receiving a third data signal sent by external host equipment according to the control signal and sending a fourth data signal to the external host equipment in a current modulation mode;
wherein, the external slave equipment and the external host equipment comprise an electric meter, a water meter or a gas meter.
2. The master-slave communication circuit of claim 1, wherein the host module comprises:
the bus protection unit is connected with a bus of the electric energy meter and is used for protecting current and voltage flowing through the bus;
the charging control unit is connected with the bus protection unit and used for charging the electric energy meter;
the operational amplifier unit is connected with the shared module and used for outputting optimized current after the operational amplification is carried out on the control signal; and
and the current limiting unit is connected with the operational amplifier unit and is used for limiting the current of the optimized current.
3. The master-slave communications circuit of claim 1, wherein the slave module comprises:
a transceiving unit for receiving the third data signal and transmitting the fourth data signal; and
and the protection unit is connected with the bus of the receiving and transmitting unit and the electric energy meter and is used for protecting the current and the voltage flowing through the bus.
4. The master-slave communication circuit of claim 1, wherein the common module comprises:
the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a sixteenth resistor, a twenty-first resistor, a first capacitor, a second capacitor, a fourth capacitor, a tenth capacitor, a third triode, a fourth triode, a first photoelectric coupler and a second photoelectric coupler;
a first end of the sixth resistor, an input end of the light receiver of the second photocoupler and a first end of the first resistor are connected with a first reference voltage, a second end of the sixth resistor is connected with a first end of the fourth capacitor and a collector of the fourth triode in common, a base of the fourth triode is connected with a first end of the seventh resistor and a first end of the second capacitor in common, an emitter of the fourth triode is grounded with a first end of the eighth resistor, a second end of the seventh resistor, a second end of the second capacitor, a second end of the eighth resistor and an output end of the light receiver of the second photocoupler are connected in common, a first end of the fourth resistor, a first end of the ninth resistor and a first end of the eleventh resistor are connected with a second reference voltage, an input end of a light emitting source of the second photocoupler is connected with a second end of the ninth resistor, an output end of the light emitting source of the second photoelectric coupler is connected to the host module, a second end of the first resistor is connected to an input end of the light emitting source of the first photoelectric coupler, an output end of the light emitting source of the first photoelectric coupler is connected to a first end of the first capacitor, a second end of the first capacitor is grounded, a second end of the fourth resistor is commonly connected to a first end of the fifth resistor and an input end of the light receiver of the first photoelectric coupler, an output end of the light receiver of the first photoelectric coupler, a first end of the tenth capacitor, a first end of the second resistor and a first end of the third resistor, a second end of the fifth resistor is commonly connected to a first end of the thirteenth resistor and a collector of the third triode, a second end of the eleventh resistor is connected to a second end of the thirteenth resistor, and a second end of the tenth capacitor, The second end of the second resistor, the first end of the twelfth resistor and the base of the third triode are connected in common, the second end of the third resistor, the second end of the twelfth resistor, the first end of the sixteenth resistor, the first end of the twenty-first resistor and the emitter of the third triode are connected in common, and the second end of the sixteenth resistor is connected with the second end of the twenty-first resistor.
5. The master-slave communication circuit of claim 2, wherein the bus protection unit comprises:
a fuse, a twenty-third resistor, and a third transient suppression diode;
the first end of the fuse and the first end of the twenty-third resistor are connected with the bus of the electric energy meter, the second end of the fuse is connected with the first end of the third transient suppression diode, and the second end of the twenty-third resistor is connected with the second end of the third transient suppression diode.
6. The master-slave communication circuit according to claim 2, wherein the charge control unit comprises:
a twenty-sixth resistor, a twenty-ninth resistor, a third capacitor and a fourth diode;
the anode of the fourth diode is connected with the bus protection unit, the cathode of the fourth diode is connected with the first end of the twenty-ninth resistor, the second end of the twenty-ninth resistor is connected with the first end of the twenty-sixth resistor and the first end of the third capacitor in common, and the second end of the twenty-sixth resistor is connected with the second end of the third capacitor in ground.
7. The master-slave communication circuit of claim 2, wherein the current limiting unit comprises:
a thirty-th resistor, a thirty-sixth resistor, a thirty-ninth resistor, and a fifty-first resistor;
the first end of the thirty-third resistor, the first end of the thirty-sixth resistor, the first end of the thirty-ninth resistor and the first end of the fifty-first resistor are connected in common and connected with the operational amplifier unit, and the second end of the thirty-third resistor, the second end of the thirty-sixth resistor, the second end of the thirty-ninth resistor and the second end of the fifty-first resistor are connected in common.
8. The master-slave communication circuit of claim 3, wherein the protection unit comprises:
a seventh transient suppression diode, a fourth adjustable resistor, an eighteenth resistor, a nineteenth resistor, and a seventy-first resistor;
the first end of the eighteenth resistor and the first end of the fourth adjustable resistor are connected with the bus of the electric energy meter, the second end of the eighteenth resistor is connected with the first end of the seventh transient suppression diode, the second end of the seventh transient suppression diode is connected with the first end of the nineteenth resistor, the first end of the seventy-first resistor is connected with the bus of the electric energy meter, and the second end of the seventy-first resistor is connected with the second end of the fourth adjustable resistor and the second end of the nineteenth resistor in a common mode.
9. The master-slave communication circuit of claim 3, wherein the transceiver unit is implemented using a transceiver integrated chip.
10. A master-slave communication device, comprising:
a master-slave communication circuit according to any of claims 1-9; and
and the master control module is connected with the master-slave machine communication circuit and used for outputting control signals.
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| CN201921396314.2U CN210780845U (en) | 2019-08-22 | 2019-08-22 | Master-slave machine communication circuit and communication device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110519141A (en) * | 2019-08-22 | 2019-11-29 | 深圳龙电电气股份有限公司 | A kind of slave communicating circuit and communication device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110519141A (en) * | 2019-08-22 | 2019-11-29 | 深圳龙电电气股份有限公司 | A kind of slave communicating circuit and communication device |
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Address after: 518000 Guangdong city of Shenzhen province Nanshan District Nanyou 107 first industrial zone 3 Patentee after: Shenzhen Longdian Huaxin Holding Group Co., Ltd Address before: 518000 Guangdong city of Shenzhen province Nanshan District Nanyou 107 first industrial zone 3 Patentee before: SHENZHEN LONDIAN ELECTRICS Co.,Ltd. |