CN2512163Y - Semi-duplex current ring communication equipment - Google Patents
Semi-duplex current ring communication equipment Download PDFInfo
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- CN2512163Y CN2512163Y CN 01258175 CN01258175U CN2512163Y CN 2512163 Y CN2512163 Y CN 2512163Y CN 01258175 CN01258175 CN 01258175 CN 01258175 U CN01258175 U CN 01258175U CN 2512163 Y CN2512163 Y CN 2512163Y
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- optocoupler
- communication unit
- diode cathode
- resistance
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Abstract
The utility model relates to a close-range semi-duplex current ring communication device and discloses a master slave mode one-to-one or one-to-many communication device for apparatus, instrument, lighting, intellectual household and air conditioner. The utility model is characterized in that: optical coupling is used for signal transmission, security isolation of a master control communication unit, a communication signal transmission ring circuit and a slave communication unit is realized, and anti-interference capability is also improved; more importantly, current always exists in the communication ring circuit during signal transmission to form a quasi electric current ring circuit, thereby further strengthening the anti-interference capability and further optimizing the operating state of the circuit. The communication device has the advantages of simple structure, high reliability and powerful anti-interference capability.
Description
Technical field
The utility model relates to the Near Field Communication technology, be specifically related to a kind of can be used in the equipment such as instrument, instrument, air conditioner and Smart Home master-slave mode one to one or the accurate electric current loop communication device of one-to-many half-duplex.
Background technology
Be usually used in the communicating circuit in the equipment such as instrument, instrument, air conditioner and Smart Home now, generally all be RS-232, or utilize the civil power zero line to do the current loop circuit of signal.The former can only realize communication one to one, and is subject to disturb under adverse circumstances, can only short distance communication; The latter links to each other with utility grid, has unsafe factor, and autgmentability is relatively poor.
Summary of the invention
The technical problems to be solved in the utility model is, above-mentioned defective at prior art, a kind of simple in structure, antijamming capability is strong, distorted signals is little and easy to use master-slave mode half duplex communication device is provided, can realizes one to one or the Near Field Communication of one-to-many.
The technical solution of the utility model is, constructs the accurate electric current loop communication device of a kind of half-duplex, comprise a master control communication unit and through communication connection be attached thereto from the control communication unit, it is characterized in that:
In described master control communication unit, the transmitting terminal of microprogram control unit MCU1 and receiving terminal receive and send optocoupler E1 respectively and receive optocoupler E2; The collector electrode that sends optocoupler E1 meets power vd D through resistance R 3, and emitter is connected to the diode cathode that receives optocoupler E2; The diode two ends that receive optocoupler E2 are parallel with resistance R 4, and diode cathode is by parallel resistor R and capacitor C ground connection GND2; The diode cathode and the ground GND2 that receive optocoupler E2 are connected to described from the control communication unit respectively behind described communication connection;
From the control communication unit, the transmitting terminal of microprogram control unit MCU2 and receiving terminal receive and send optocoupler E3 respectively and receive optocoupler E4 described; The collector electrode that sends optocoupler E3 is connected to the diode cathode that receives optocoupler E2 through described communication connection, and emitter is connected to the diode cathode that receives optocoupler E4; The diode two ends that receive optocoupler E4 are parallel with resistance R 5, and diode cathode is ground connection GND2 behind described communication connection.
In the described master control communication unit of device described in the utility model, the transmitting terminal of microprogram control unit MCU1 receives and sends the diode cathode of optocoupler E1 after resistance R 1, the diode cathode that sends optocoupler E1 meets power supply VCC1, the receiving terminal of microprogram control unit MCU1 is connected to the emitter of reception optocoupler E2 and simultaneously through resistance R 2 ground connection GND1, the collector electrode that receives optocoupler E2 meets power supply VCC2; Wherein said this partial circuit and described master control communication unit from the control communication unit is symmetrical fully.
In device described in the utility model, described communication connection just is connected to current collection collection that sends optocoupler E3 and the diode cathode that receives optocoupler E4 after passing through the polar protective circuit of being made up of four diode D1-D4.
In device described in the utility model, described resistance R can move on between the negative pole of the positive pole of described diode D1 and D4; Also can be divided into two resistance is connected between the diode cathode of E2 and the GND2 respectively and between the negative pole of the positive pole of D1 and D4.
In device described in the utility model, master control communication unit can connect a plurality ofly realizes the one-to-many communication from the control communication unit, and wherein a kind of mode is to be connected respectively to by two outputs many communication connections in parallel that the diode cathode of described reception optocoupler E2 and ground GND2 draw that each is described from the control communication unit; Another kind of mode is that microprogram control unit MCU1 has a plurality of receiving terminals in the described master control communication unit, connects a plurality of reception photoelectric coupled circuit respectively, and each receives photoelectric coupled circuit and connects a plurality of described from the control communication unit through communication connection respectively.
The accurate electric current loop communication device of the half-duplex that the utility model provides has adopted optocoupler to carry out the transmission of signal, realized master control communication unit, communication signal transmit ring, isolated from the safety between the control communication unit, and improved antijamming capability, the more important thing is, when signal transmits, there is electric current to exist in the communication loop all the time, current loop circuit becomes to be as the criterion, thereby make antijamming capability further strengthen, and the operating state of circuit is more optimized.Whole communication device has characteristics such as simple in structure, that reliability is high, antijamming capability is strong.
The utility model is described in further detail below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the circuit diagram of communication device one to one among the utility model embodiment one;
Fig. 2 is the circuit diagram of one-to-many communication device among the utility model embodiment two;
Fig. 3 is the circuit diagram of another kind of one-to-many communication device among the utility model embodiment three
Fig. 4 is the schematic diagram the when resistance R among Fig. 1 is changed into two resistance and lays respectively at master-slave unit.
Embodiment
The circuit of this device embodiment one as shown in Figure 1, it is by the master control communication unit 1 of near symmetrical with from control communication unit 2, and a communication connection 3 is formed.
Master control communication unit 1 is by microprogram control unit MCU1,2 optocoupler E1 and E2, and 5 resistance R and R1-R4 form.The transmitting terminal TX1 of MCU1 connects the diode cathode of E1 behind R1, the diode cathode of E1 meets power supply VCC1, and the receiving terminal RX1 of MCU1 is connected to the emitter of E2 and simultaneously through resistance R 2 ground connection GND1, the collector electrode of E2 meets power supply VCC2; The collector electrode of E1 meets power vd D after resistance R 3, the emitter of E1 is connected to the diode cathode of E2, and the diode two ends of E2 are parallel with resistance R 4, and the diode cathode of E2 is by resistance R ground connection GND2, the two ends of resistance R are signal output part, are connected to behind communication connection 3 from control communication unit 2.
From control communication unit 2 by microprogram control unit MCU2,4 diode D1-D4,2 optocoupler E3 and E4, and 3 resistance R 5-R7 constitute, it and master control communication unit 1 near symmetrical.Wherein 4 diode D1-D4 form polar protective circuit, allow communication connection can realize nonpolarity connection.The collector electrode of E3 is connected to the diode cathode of E2 through communication connection 3, and the diode cathode of E4 is ground connection GND2 behind communication connection 3.
When stopping communication, TX1 keeps high level always, and this moment, the communication loop no current flow through; When master control communication unit TX1 sends signal, keep low level from the TX2 of control communication unit always, form accurate current loop this moment and realized receiving from the signal of control communication unit RX2; When TX1 keeps low level always, when the TX2 of control communication unit sends signal, can form accurate current loop and realize that the signal of master control communication unit RX1 receives, thereby realize half duplex communication.As seen send optocoupler E1 and both can be used to send signal, also can be used as the communication shutdown switch.
The resistance of the utility model resistance R and R1-R7 is chosen according to the characteristic of practical power voltage and optocoupler, is optocoupler best operating point electric current with the loop current, and receiving end signal to obtain the normal logic level signal be foundation.Key is the selection of R3 in the current loop, R4 and R:
The electric current of E2 of flowing through when E3 closes will guarantee to be lower than Io: Io=1/ β * R4, and wherein β is the current transfer ratio of optocoupler;
When the E3 conducting, the electric current of the E2 that flows through will guarantee to be higher than Io ｀: Io ｀=4/ β * R4;
Voltage on the R should be greater than 2.8V;
When the big current lead-through of loop, guarantee that voltage on the R7 is greater than 4V.
Adjust in conjunction with experiment again by above-mentioned these qualificationss, can obtain the resistance value of suitable R and R1-R7; Work as VDD=15V, VCC1=VCC3=5V during VCC2=VCC4=5V, can get R1=390 Ω, R2=1K Ω, R3=680 Ω, R4=680 Ω, R5=3K Ω, R6=390 Ω, R7=4.7K Ω, R=10K Ω.
As can be seen, optocoupler E1-E4 has realized master control communication unit and communication loop, has isolated from the safety between the control communication unit, and this separate power supply architecture has reduced the noise coupling between different circuit, has improved the antijamming capability of communication unit greatly.
Resistance R among Fig. 1 can move on between the negative pole of the positive pole of D1 and D4, perhaps as shown in Figure 4, can also be divided into two resistance and be connected between the diode cathode of E2 and the GND2 respectively and between the negative pole of the positive pole of D1 and D4.
Circuit among Fig. 1 has been realized communication one to one, can also expand to realize the one-to-many communication circuit shown in Figure 1, is illustrated in figure 2 as the circuit diagram that can realize the one-to-many communication among the embodiment two.Wherein the MCU1 of master control communication unit 21 has a plurality of transmitting terminal RX1A, RX1B..., thereby draw E2A, the E2B... of a plurality of parallel connections, be connected to a plurality ofly more respectively by many communication connections 3,, can add buffering drive circuit when MCU1 drives when not enough from the control communication unit.Only illustrated an expanding element among Fig. 2, in fact also can expand a plurality ofly, formed the one-to-many half duplex communication from the control communication unit.
Figure 3 shows that the another kind of circuit diagram of realizing the one-to-many communication among the utility model embodiment three, master control communication unit 31 wherein is simpler than embodiment two as can be seen, just drawn the joint of a plurality of parallel connections in Fig. 1 on the basis of master control communication unit 1, communication connection is with identical from control communication unit and Fig. 2.Equally, also can expand a plurality ofly at Fig. 3, form the one-to-many half duplex communication from the control communication unit.
Claims (6)
1, the accurate electric current loop communication device of a kind of half-duplex, comprise a master control communication unit and through communication connection be attached thereto from the control communication unit, it is characterized in that:
In described master control communication unit, the transmitting terminal of microprogram control unit MCU1 and receiving terminal receive and send optocoupler E1 respectively and receive optocoupler E2; The collector electrode that sends optocoupler E1 meets power vd D through resistance R 3, and emitter is connected to the diode cathode that receives optocoupler E2; The diode two ends that receive optocoupler E2 are parallel with resistance R 4, and diode cathode is by parallel resistor R and capacitor C ground connection GND2; The diode cathode and the ground GND2 that receive optocoupler E2 are connected to described from the control communication unit respectively behind described communication connection;
From the control communication unit, the transmitting terminal of microprogram control unit MCU2 and receiving terminal receive and send optocoupler E3 respectively and receive optocoupler E4 described; The collector electrode that sends optocoupler E3 is connected to the diode cathode that receives optocoupler E2 through described communication connection, and emitter is connected to the diode cathode that receives optocoupler E4; The diode two ends that receive optocoupler E4 are parallel with resistance R 5, and diode cathode is ground connection GND2 behind described communication connection.
2, device according to claim 1 is characterized in that:
In described master control communication unit, the transmitting terminal of microprogram control unit MCU1 receives and sends the diode cathode of optocoupler E1 after resistance R 1, the diode cathode that sends optocoupler E1 meets power supply VCC1, the receiving terminal of microprogram control unit MCU1 is connected to the emitter of reception optocoupler E2 and simultaneously through resistance R 2 ground connection GND1, the collector electrode that receives optocoupler E2 meets power supply VCC2;
Described from the control communication unit, the transmitting terminal of microprogram control unit MCU2 receives and sends the diode cathode of optocoupler E3 after resistance R 6, the diode cathode that sends optocoupler E3 meets power supply VCC3, the receiving terminal of microprogram control unit MCU2 is connected to the emitter of reception optocoupler E4 and simultaneously through resistance R 7 ground connection GND3, the collector electrode that receives optocoupler E2 meets power supply VCC4.
3, device according to claim 1 is characterized in that, described communication connection just is connected to current collection collection that sends optocoupler E3 and the diode cathode that receives optocoupler E4 after passing through the polar protective circuit of being made up of four diode D1-D4.
4, device according to claim 3 is characterized in that, described resistance R can move on between the negative pole of the positive pole of described diode D1 and D4; Also can be divided into two resistance is connected between the diode cathode of E2 and the GND2 respectively and between the negative pole of the positive pole of D1 and D4.
5, according to each described device among the claim 1-4, it is characterized in that, diode cathode by described reception optocoupler E2 is parallel with many communication connections with two outputs that ground GND2 draws, and described many communication connections are connected respectively to a plurality of described from the control communication unit.
6, according to each described device among the claim 1-4, it is characterized in that, microprogram control unit MCU1 has a plurality of receiving terminals in the described master control communication unit, connects a plurality of reception photoelectric coupled circuit respectively, and each receives photoelectric coupled circuit and connects a plurality of described from the control communication unit through communication connection respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01258175 CN2512163Y (en) | 2001-11-19 | 2001-11-19 | Semi-duplex current ring communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01258175 CN2512163Y (en) | 2001-11-19 | 2001-11-19 | Semi-duplex current ring communication equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2512163Y true CN2512163Y (en) | 2002-09-18 |
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ID=33666796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01258175 Expired - Fee Related CN2512163Y (en) | 2001-11-19 | 2001-11-19 | Semi-duplex current ring communication equipment |
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| Country | Link |
|---|---|
| CN (1) | CN2512163Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102045153A (en) * | 2010-11-03 | 2011-05-04 | 苏州合欣美电子科技有限公司 | Half-duplex three-wire system communication circuit |
| CN102281083A (en) * | 2011-07-27 | 2011-12-14 | 江苏浩峰汽车附件有限公司 | Current-loop communication circuit for photovoltaic system |
| CN107967800A (en) * | 2017-11-02 | 2018-04-27 | 新疆广陆能源科技股份有限公司 | A kind of transmitter current loop signals branch unit |
-
2001
- 2001-11-19 CN CN 01258175 patent/CN2512163Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102045153A (en) * | 2010-11-03 | 2011-05-04 | 苏州合欣美电子科技有限公司 | Half-duplex three-wire system communication circuit |
| CN102281083A (en) * | 2011-07-27 | 2011-12-14 | 江苏浩峰汽车附件有限公司 | Current-loop communication circuit for photovoltaic system |
| CN107967800A (en) * | 2017-11-02 | 2018-04-27 | 新疆广陆能源科技股份有限公司 | A kind of transmitter current loop signals branch unit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |