CN203259590U - RS485 communication circuit - Google Patents
RS485 communication circuit Download PDFInfo
- Publication number
- CN203259590U CN203259590U CN 201320228426 CN201320228426U CN203259590U CN 203259590 U CN203259590 U CN 203259590U CN 201320228426 CN201320228426 CN 201320228426 CN 201320228426 U CN201320228426 U CN 201320228426U CN 203259590 U CN203259590 U CN 203259590U
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- circuit
- waveform shaping
- resistance
- shaping circuit
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Abstract
The utility model discloses an RS485 communication circuit comprising a 485 chip, an input circuit, a peripheral circuit, an output circuit, and a control enable circuit. The input circuit, the peripheral circuit, the output circuit, and the control enable circuit are connected with the 485 chip. The RS485 communication circuit also comprises a first waveform shaping circuit and a second waveform shaping circuit. An input end of the first waveform shaping circuit is connected with the input circuit, and an output end of the first waveform shaping circuit is connected with the 485 chip. The second waveform shaping circuit is connected with an output end of the output circuit. The RS485 communication circuit is suitable for the high-speed signal transmission.
Description
Technical field
The utility model relates to a kind of communicating circuit for electric energy meter, specifically is a kind of RS485 communicating circuit.
Background technology
The RS485 communicating circuit of prior art comprises 485 chips, input circuit, peripheral circuit, output circuit and a control enable circuits; Described input circuit, peripheral circuit, output circuit, control enable circuits all are connected with 485 chips.There is following defective in the RS485 communicating circuit of said structure in the use procedure of reality: owing to the photoelectrical coupler in input circuit, the output circuit directly is connected with the RS485 chip, therefore photoelectrical coupler is operated in the saturated state of the degree of depth, photoelectrical coupler enters saturated longer with the time that withdraw from like this, must cause photoelectrical coupler rear end rising edge and negative edge time longer, so that the signal skew of transmission causes the RS485 chip can not work and so that the signal bust this.Especially when the signal of some two-forties (10kHz), the waveform of its signal transmission is more yielding, the easier failure that causes communication.In addition, high temperature can cause the transfer ratio (CTR) of photoelectrical coupler to reduce, so that photoelectrical coupler deflects away from saturated state, thereby causes the failure of communication.
The utility model content
The technical problems to be solved in the utility model is, overcomes the defective of above prior art, and a kind of RS485 communicating circuit that can be fit to the transmission of two-forty signal is provided.
The technical solution of the utility model is, a kind of RS485 communicating circuit is provided, and comprises 485 chips, input circuit, peripheral circuit, output circuit and a control enable circuits; Described input circuit, peripheral circuit, output circuit, control enable circuits all are connected with 485 chips, described RS485 communicating circuit also comprises the first waveform shaping circuit and the second waveform shaping circuit, the input end of described the first waveform shaping circuit is connected with input circuit, and the output terminal of described the first waveform shaping circuit is connected with 485 chips; Described the second waveform shaping circuit is connected with the output terminal of output circuit.
The first waveform shaping circuit is identical with the circuit structure of the second waveform shaping circuit; Described waveform shaping circuit comprises a triode, the first resistance and the second resistance, and the b utmost point of described triode is connected with an end of the first resistance, and the c utmost point of described triode is connected with an end of the second resistance, and the e utmost point of described triode is connected with earth terminal; The other end of described the second resistance is connected with power end.
After adopting above structure, the utility model compared with prior art has the following advantages:
The input end of the first waveform shaping circuit of the utility model RS485 communicating circuit is connected with input circuit, and the output terminal of described the first waveform shaping circuit is connected with 485 chips; Described the second waveform shaping circuit is connected with the output terminal of output circuit, effectively integrate by the waveform of waveform shaping circuit to signal, can make photoelectrical coupler be operated in the amplification region, like this photoelectrical coupler be transformed into the needed time of cut-off state by the amplification region can be shorter, guaranteed the indeformable of signal transmission waveform, thereby so that the RS485 chip can work, and then guaranteed the success of communication.In addition, although high temperature can cause the transfer ratio (CTR) of photoelectrical coupler to reduce, because photoelectrical coupler is to be operated in the amplification region, therefore also can guarantee the success of communication.
As improvement, described waveform shaping circuit also comprises an electric capacity, the two ends of described electric capacity are connected with the two ends of the first resistance respectively, can further reduce photoelectrical coupler by electric capacity and be transformed into the needed time of cut-off state by the amplification region, thereby further guarantee the success of communication.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model RS485 communicating circuit.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, a kind of RS485 communicating circuit of the utility model comprises 485 chips, input circuit, peripheral circuit, output circuit and a control enable circuits, and wherein 485 chips are as indicating shown in the of 1 among Fig. 1, and model is SN65HVD3082ED; Input circuit is shown in the sign 2 among Fig. 1; Peripheral circuit is shown in the sign 3 among Fig. 1; Output circuit is shown in the sign 4 among Fig. 1; The control enable circuits is shown in the sign 5 among Fig. 1; Said structure is prior art, is not described in detail in this.
Described input circuit, peripheral circuit, output circuit, the control enable circuits all is connected with 485 chips, described RS485 communicating circuit also comprises the first waveform shaping circuit and the second waveform shaping circuit, the input end of described the first waveform shaping circuit is connected with input circuit, the output terminal of described the first waveform shaping circuit is connected with 485 chips, namely the first waveform shaping circuit is by the second resistance R 9, the first resistance R 11, capacitor C 2, triode V2 forms, the first resistance R 11 is connected with the output pin of photoelectrical coupler E3 and gets final product, and the c utmost point of triode V2 is connected with the DI pin of 485 chips and gets final product; After being shaped the circuit shaping, the signal of processing through photoelectrical coupler like this sends 485 chips to; Described the second waveform shaping circuit is connected with the output terminal of output circuit.After being shaped the circuit shaping, the signal of processing through photoelectrical coupler like this sends electric energy meter to, the second waveform shaping circuit is comprised of the second resistance R 1, the first resistance R 4, capacitor C 1, triode V1, and the first resistance R 4 is connected with the output pin of photoelectrical coupler E1 and gets final product;
The first waveform shaping circuit is identical with the circuit structure of the second waveform shaping circuit; Described waveform shaping circuit comprises a triode, the first resistance and the second resistance, and the b utmost point of described triode is connected with an end of the first resistance, and the c utmost point of described triode is connected with an end of the second resistance, and the e utmost point of described triode is connected with earth terminal; The other end of described the second resistance is connected with power end.In the present embodiment, the first waveform shaping circuit is shown in the sign 6 among Fig. 1; The second waveform shaping circuit is shown in the sign 7 among Fig. 1.
Described waveform shaping circuit also comprises an electric capacity, and the two ends of described electric capacity are connected with the two ends of the first resistance respectively.The utility model RS485 communicating circuit can guarantee the success ratio of 10KHZ-50KHZ communication.
Below only be described with regard to most preferred embodiment of the present utility model, but can not be interpreted as it is limitations on claims.The utility model is not limited only to above embodiment, and its concrete structure allows to change.All various variations of doing in the protection domain of the utility model independent claims are all in protection domain of the present utility model.
Claims (3)
1. a RS485 communicating circuit comprises 485 chips, input circuit, peripheral circuit, output circuit and a control enable circuits; Described input circuit, peripheral circuit, output circuit, control enable circuits all are connected with 485 chips, it is characterized in that: described RS485 communicating circuit also comprises the first waveform shaping circuit and the second waveform shaping circuit, the input end of described the first waveform shaping circuit is connected with input circuit, and the output terminal of described the first waveform shaping circuit is connected with 485 chips; Described the second waveform shaping circuit is connected with the output terminal of output circuit.
2. RS485 communicating circuit according to claim 1, it is characterized in that: the first waveform shaping circuit is identical with the circuit structure of the second waveform shaping circuit; Described waveform shaping circuit comprises a triode, the first resistance and the second resistance, and the b utmost point of described triode is connected with an end of the first resistance, and the c utmost point of described triode is connected with an end of the second resistance, and the e utmost point of described triode is connected with earth terminal; The other end of described the second resistance is connected with power end.
3. RS485 communicating circuit according to claim 2, it is characterized in that: described waveform shaping circuit also comprises an electric capacity, the two ends of described electric capacity are connected with the two ends of the first resistance respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320228426 CN203259590U (en) | 2013-04-28 | 2013-04-28 | RS485 communication circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320228426 CN203259590U (en) | 2013-04-28 | 2013-04-28 | RS485 communication circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203259590U true CN203259590U (en) | 2013-10-30 |
Family
ID=49472141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320228426 Expired - Lifetime CN203259590U (en) | 2013-04-28 | 2013-04-28 | RS485 communication circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203259590U (en) |
-
2013
- 2013-04-28 CN CN 201320228426 patent/CN203259590U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 315191 Yinzhou Industrial Park, Zhejiang, Ningbo, Yinzhou District, Ningbo Patentee after: NINGBO SANXING MEDICAL & ELECTRIC Co.,Ltd. Address before: 315131, AUX Industrial Park, Mingguang North Road, Jiangshan Town, Ningbo, Yinzhou District, Zhejiang 1166, China Patentee before: NINGBO SANXING ELECTRIC Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20131030 |
|
| CX01 | Expiry of patent term |