CN205749617U - Intelligent electric energy meter polarized RS485 and nonpolarity RS485 compatibility interface circuit - Google Patents
Intelligent electric energy meter polarized RS485 and nonpolarity RS485 compatibility interface circuit Download PDFInfo
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- CN205749617U CN205749617U CN201620582224.2U CN201620582224U CN205749617U CN 205749617 U CN205749617 U CN 205749617U CN 201620582224 U CN201620582224 U CN 201620582224U CN 205749617 U CN205749617 U CN 205749617U
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Abstract
This utility model is a kind of intelligent electric energy meter polarized RS485 and nonpolarity RS485 compatibility interface circuit; it is characterized in: include that RS485 chip electrically connects with RS485 interface bus over-voltage over-current protection circuit, received data circuit, RS485 reiving/transmitting state control switching circuit and transmitted data circuit respectively, and put on a circuit board.Can be by accessing or disconnect the resistance R73 and resistance R74 of RS485 interface bus over-voltage over-current protection circuit; just disclosure satisfy that the different user requirement to RS485 polarity, make the production of intelligent electric energy meter, maintenance the most convenient, and production cost is low; saving of work and time, testing efficiency is high.
Description
Technical field
This utility model belongs to field tests, is that a kind of intelligent electric energy meter polarized RS485 is compatible with nonpolarity RS485
Interface circuit.
Background technology
The intelligent electric energy meter that China's electrical network is used no matter single-phase intelligent electric energy meter, or three-phase meter intelligence electric energy all has
Having RS485 communication interface, RS485 interface is intelligent electric energy meter with the mutual key interface of external information.RS485 interface circuit divides
For polarized interface circuit and nonpolarity interface circuit two kinds, in use cut both ways.Each province belonging to State Grid Corporation of China
Net company is inconsistent to the polar requirement of RS485 interface, and some province net companies require to use nonpolarity RS485 interface,
So it is easy to in-site installation wiring；Also the province net company having requires to use polarized RS485.Due to RS485 interface
Polar requirement different, hardware is different, causes the design of circuit board, wiring also different, causes intelligent electric energy meter manufacturer i.e.
Make production with a product, also to design multiple circuit board and meet the demand of different client, so can make intelligent electric energy meter
Production, inconvenient maintenance, and add production cost.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of production, keeps in repair and use equal inconvenience, testing efficiency
Height, low intelligent electric energy meter polarized RS485 of production cost and nonpolarity RS485 compatibility interface circuit.
Solving its technical problem employed technical scheme comprise that, a kind of intelligent electric energy meter polarized RS485 is with nonpolarity
RS485 compatibility interface circuit, is characterized in that: it include RS485 chip respectively with RS485 interface bus over-voltage over-current protection circuit
, received data circuit, RS485 reiving/transmitting state control switching circuit and transmitted data circuit electrical connection, and put at a circuit board
On.
Described RS485 interface bus over-voltage over-current protection circuit is by two-way TVS transition diode TVS1 and critesistor
RT2 electrically connects composition, for nonpolarity RS485 communication.
Described RS485 interface bus over-voltage over-current protection circuit or by two-way TVS transition diode TVS1, critesistor
RT2, resistance R73 and resistance R74 electrical connection composition, for the communication of polarized RS485.
Described received data circuit is made up of electric capacity C21, C43, resistance R56, R64, R70 and optocoupler E4 electrical connection, will
The RXD end of single-chip microcomputer it is sent to after the serial data demodulation that RS485 chip D5 receives.
Described RS485 reiving/transmitting state control switching circuit is electrically connected by resistance R17, R66, R72 and optocoupler E12 and forms, control
Direction of communication processed is in transmission or reception state.
Described transmitted data circuit is electrically connected by resistance R57, R71, R76 and optocoupler E5 and forms, by the TXD end of single-chip microcomputer
Send data and be sent to RS485 chip D5, after RS485 chip D5 modulates, be sent to communication twisted-pair feeder.
Intelligent electric energy meter polarized RS485 of the present utility model and nonpolarity RS485 compatibility interface circuit, owing to using
RS485 chip switches with RS485 interface bus over-voltage over-current protection circuit, received data circuit, RS485 reiving/transmitting state respectively
Control circuit and transmitted data circuit electrical connection, and put on a circuit board, it is possible to by accessing or disconnecting RS485 interface
The resistance R73 and resistance R74 of bus over-voltage over-current protection circuit, it becomes possible to meet the different user requirement to RS485 polarity, make
The production of intelligent electric energy meter, maintenance are the most convenient, and production cost is low, saving of work and time, and testing efficiency is high.
Accompanying drawing explanation
Fig. 1 polarized RS485 and nonpolarity RS485 compatibility interface circuit.
In figure: 1 RS485 interface bus over-voltage over-current protection circuit, 2 received data circuits, 3 RS485 reiving/transmitting states are cut
Change control circuit, 4 transmitted data circuits, 5 RS485 chips.
Detailed description of the invention
With reference to Fig. 1, a kind of intelligent electric energy meter polarized RS485 of the present utility model and nonpolarity RS485 compatibility interface
Circuit, including RS485 chip 5 respectively with RS485 interface bus over-voltage over-current protection circuit 1, received data circuit 2, RS485
Reiving/transmitting state control switching circuit 3 and transmitted data circuit 4 electrically connect, and put on a circuit board.Described RS485 interface is total
Line over-voltage over-current protection circuit 1 is electrically connected with critesistor RT2 by two-way TVS transition diode TVS1 and forms, for nonpolarity
RS485 communication.Described RS485 interface bus over-voltage over-current protection circuit 1 or by two-way TVS transition diode TVS1, temperature-sensitive electricity
Resistance RT2, resistance R73 and resistance R74 electrical connection composition, for the communication of polarized RS485.Described received data circuit 2 is by electric capacity
C21, C43, resistance R56, R64, R70 and optocoupler E4 electrical connection composition, by RS485 chip 5, i.e. RS485 chip D5 receives
The RXD end of single-chip microcomputer it is sent to after serial data demodulation.Described RS485 reiving/transmitting state control switching circuit 3 by resistance R17,
R66, R72 and optocoupler E12 electrical connection composition, communication control direction is in transmission or reception state.Described transmitted data circuit 4 by
The transmission data of the TXD end of single-chip microcomputer are sent to RS485 chip D5 by resistance R57, R71, R76 and optocoupler E5 electrical connection composition,
It is sent to communication twisted-pair feeder after RS485 chip D5 modulates.
Intelligent electric energy meter polarized RS485 of the present utility model is nonpolarity with nonpolarity RS485 compatibility interface circuit
Work process is: the resistance R73 and resistance R74 of RS485 interface bus over-voltage over-current protection circuit 1 are not connected to so that connection
Road is in nonpolarity state, when PERCOM peripheral communication data signal is via twisted-pair feeder, by two-way TVS transition diode TVS1, temperature-sensitive
Resistance RT2 is delivered to RS485 chip 5, i.e., after RS485 chip D5, RS485 chip D5 modulates signals into, sent by data message
To by electric capacity C21, C43, resistance R56, R64, R70 and the received data circuit 2 of optocoupler E4 composition, be finally sent to single-chip microcomputer/
The serial ports RXD end of processor, completes data message reception work；When single-chip microcomputer/processor has processed the data message just received
After, the RS485 reiving/transmitting state control switching circuit 3 formed via resistance R17, R66, R72 and optocoupler E12, by RS485 chip D5
Duty switch to transmission state；Again by single-chip microcomputer/processor by the data message of response via serial ports TXD end send out
Deliver to the transmitted data circuit 4 being made up of resistance R57, R71, R76 and optocoupler E5, transmit data to RS485 chip D5 and enter
After row modulation, re-send to communication twisted-pair feeder and complete data transmission work；Control signal, warp is sent again by single-chip microcomputer/processor
The RS485 reiving/transmitting state control switching circuit 3 being made up of resistance R17, R66, R72 and optocoupler E12, by the work of RS485 chip D5
Reception state is switched to be that the nonpolarity communication of next round is ready as state.
Intelligent electric energy meter polarized RS485 of the present utility model and the polarized of nonpolarity RS485 compatibility interface circuit
Work process is: connect the resistance R73 and resistance R74 of RS485 interface bus over-voltage over-current protection circuit 1, by resistance R73 to electricity
Source composition pull-up circuit and resistance R74 form pull-down circuit over the ground, produce the polarity of RS485 communication line so that communication line
It is in polarized state.When PERCOM peripheral communication data signal via twisted-pair feeder by two-way TVS transition diode TVS1, temperature-sensitive electricity
After the RS485 interface bus over-voltage over-current protection circuit 1 of resistance RT2 composition, be delivered to RS485 chip 5, i.e. RS485 chip D5,
After RS485 chip D5 modulates signals into, data message is sent to by electric capacity C21, C43, resistance R56, R64, R70 and optocoupler E4
The received data circuit 2 of composition, is finally sent to the serial ports RXD end of single-chip microcomputer/processor, completes data message reception work；
After single-chip microcomputer/processor has processed the data message just received, form via resistance R17, R66, R72 and optocoupler E12
RS485 reiving/transmitting state control switching circuit 3, switches to transmission state by the duty of RS485 chip D5；Again by single-chip microcomputer/
Processor by the data message of response via serial ports TXD end be sent to be made up of resistance R57, R71, R76 and optocoupler E5
Transmitted data circuit 4, transmits data to after RS485 chip D5 is modulated, re-send to communication twisted-pair feeder, complete data and send out
Send work；Control signal is sent again, the RS485 formed via resistance R17, R66, R72 and optocoupler E12 by single-chip microcomputer/processor
Reiving/transmitting state control switching circuit 3, it is next round polarized communication that the duty of RS485 chip D5 switches to reception state
Ready.
Intelligent electric energy meter polarized RS485 of the present utility model and all electricity of nonpolarity RS485 compatibility interface circuit
Sub-components and parts are commercially available prod.This utility model is not limited to this detailed description of the invention, to those skilled in the art,
Simple copy and improvement without creative work belong to this utility model scope of the claimed protection.
Claims (6)
1. intelligent electric energy meter polarized RS485 and a nonpolarity RS485 compatibility interface circuit, is characterized in that: it includes
RS485 chip D5 cuts with RS485 interface bus over-voltage over-current protection circuit, received data circuit, RS485 reiving/transmitting state respectively
Change control circuit and transmitted data circuit electrical connection, and put on a circuit board.
Intelligent electric energy meter polarized RS485 the most according to claim 1 and nonpolarity RS485 compatibility interface circuit, its
Feature is: described RS485 interface bus over-voltage over-current protection circuit is by two-way TVS transition diode TVS1 and critesistor RT2
Electrical connection composition, for nonpolarity RS485 communication.
Intelligent electric energy meter polarized RS485 the most according to claim 1 and nonpolarity RS485 compatibility interface circuit, its
Feature is: described RS485 interface bus over-voltage over-current protection circuit by two-way TVS transition diode TVS1, critesistor RT2,
Resistance R73 and resistance R74 electrical connection composition, for the communication of polarized RS485.
Intelligent electric energy meter polarized RS485 the most according to claim 1 and nonpolarity RS485 compatibility interface circuit, its
Feature is: described received data circuit is made up of electric capacity C21, C43, resistance R56, R64, R70 and optocoupler E4 electrical connection, will
The RXD end of single-chip microcomputer it is sent to after the serial data demodulation that RS485 chip D5 receives.
Intelligent electric energy meter polarized RS485 the most according to claim 1 and nonpolarity RS485 compatibility interface circuit, its
Feature is: described RS485 reiving/transmitting state control switching circuit is electrically connected by resistance R17, R66, R72 and optocoupler E12 and forms, and controls
Direction of communication is in transmission or reception state.
Intelligent electric energy meter polarized RS485 the most according to claim 1 and nonpolarity RS485 compatibility interface circuit, its
Feature is: described transmitted data circuit is electrically connected by resistance R57, R71, R76 and optocoupler E5 and forms, by the TXD end of single-chip microcomputer
Send data and be sent to RS485 chip D5, after RS485 chip D5 modulates, be sent to communication twisted-pair feeder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620582224.2U CN205749617U (en) | 2016-06-16 | 2016-06-16 | Intelligent electric energy meter polarized RS485 and nonpolarity RS485 compatibility interface circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620582224.2U CN205749617U (en) | 2016-06-16 | 2016-06-16 | Intelligent electric energy meter polarized RS485 and nonpolarity RS485 compatibility interface circuit |
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| CN205749617U true CN205749617U (en) | 2016-11-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064587A (en) * | 2016-12-13 | 2017-08-18 | 浙江恒业电子有限公司 | A kind of electric energy meter circuit |
| CN107181654A (en) * | 2017-06-30 | 2017-09-19 | 珠海格力电器股份有限公司 | CAN communication method and system for controlling local area network and air conditioning system |
| CN111862572A (en) * | 2020-08-20 | 2020-10-30 | 杭州华罡智能科技有限公司 | RS485 terminal meter reading system and meter reading mode |
-
2016
- 2016-06-16 CN CN201620582224.2U patent/CN205749617U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064587A (en) * | 2016-12-13 | 2017-08-18 | 浙江恒业电子有限公司 | A kind of electric energy meter circuit |
| CN107181654A (en) * | 2017-06-30 | 2017-09-19 | 珠海格力电器股份有限公司 | CAN communication method and system for controlling local area network and air conditioning system |
| CN107181654B (en) * | 2017-06-30 | 2020-01-17 | 珠海格力电器股份有限公司 | CAN communication method and system for controlling local area network and air conditioning system |
| CN111862572A (en) * | 2020-08-20 | 2020-10-30 | 杭州华罡智能科技有限公司 | RS485 terminal meter reading system and meter reading mode |
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