CN204794962U - Modified RS485 communication circuit - Google Patents
Modified RS485 communication circuit Download PDFInfo
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- CN204794962U CN204794962U CN201520529686.3U CN201520529686U CN204794962U CN 204794962 U CN204794962 U CN 204794962U CN 201520529686 U CN201520529686 U CN 201520529686U CN 204794962 U CN204794962 U CN 204794962U
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- resistance
- triode
- amplifier
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- fortune
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Abstract
The utility model discloses a modified RS485 communication circuit, the positive going input end that signal input part was put through first ohmic connection to first fortune, the reverse input end that reference level was put through second ohmic connection to first fortune, the output that reverse input end that first fortune was put through third ohmic connection to first fortune, the positive going input end that first fortune was put is through fourth grounding, the output that first fortune was put passes through the base of the 5th ohmic connection to first triode, signal input part is through the collecting electrode of the 6th ohmic connection to first triode, seven resistance and eight grounding of projecting pole through establishing ties of first triode, the reverse input end of putting is transported through a capacitance connection to the collecting electrode of first triode to the second, the positive going input end that second fortune was put is through the 9th grounding, the output that second fortune was put passes through the collecting electrode of the tenth ohmic connection to second triode. The utility model discloses the not enough of prior art can be improved, the reliability of RS485 communication circuit is improved.
Description
Technical field
The utility model relates to communication technique field, especially a kind of RS485 communicating circuit of improvement.
Background technology
Often need in power electronic equipment to carry out telecommunication in severe electric power environmental, RS485 has become first-selected communication modes.RS485 communication is generally applied in half duplex communication, and namely only allow an equipment to send signal to main frame in certain moment, other equipment must be in accepting state, and the order all devices that main frame issues all can receive.When the signal in RS485 communication network be subject to external interference there are unusual fluctuations time, can damage components and parts, transistor circuit and interface circuit, thus make the functional reliability of prior art RS485 communicating circuit lower.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of RS485 communicating circuit of improvement, can solve the deficiencies in the prior art, improves the reliability of RS485 communicating circuit.
For solving the problems of the technologies described above, technical solution adopted in the utility model is as follows.
A kind of RS485 communicating circuit of improvement, signal input part is connected to the positive input of the first amplifier by the first resistance, reference level is connected to the reverse input end of the first amplifier by the second resistance, the reverse input end of the first amplifier is connected to the output of the first amplifier by the 3rd resistance, the positive input of the first amplifier is by the 4th grounding through resistance, the output of the first amplifier is connected to the base stage of the first triode by the 5th resistance, signal input part is connected to the collector electrode of the first triode by the 6th resistance, the emitter of the first triode passes through the 7th resistance and the 8th grounding through resistance of series connection, the collector electrode of the first triode is connected to the reverse input end of the second amplifier by the first electric capacity, the positive input of the second amplifier is by the 9th grounding through resistance, the output of the second amplifier is connected to the collector electrode of the second triode by the tenth resistance, the reverse input end of the second amplifier is connected to the output of the second amplifier by the 11 resistance, the base stage of the second triode is connected between the 7th resistance and the 8th resistance, the emitter of the second triode is connected to signal output part, signal output part is by the second capacity earth.
The beneficial effect adopting technique scheme to bring is: the utility model by gathering the signal on communication line, and compares with reference level.If comparing result difference is comparatively large, then the first triode ON, carries out shunting step-down to signal voltage higher on script communication line.If overtension, voltage on corresponding diverter branch also can increase, then the second triode ON, the second amplifier is utilized oppositely to differentiate to signal voltage, then the output signal of computing is utilized to regulate the signal voltage on communication line, thus ensure that the signal level on RS485 communication line is in a metastable scope, improve the reliability of RS485 communicating circuit.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model embodiment.
In figure: IN, signal input part; R1, the first resistance; R2, the second resistance; R3, the 3rd resistance; R4, the 4th resistance; R5, the 5th resistance; R6, the 6th resistance; R7, the 7th resistance; R8, the 8th resistance; R9, the 9th resistance; R10, the tenth resistance; R11, the 11 resistance; C1, the first electric capacity; C2, the second electric capacity; A1, the first amplifier; A2, the second amplifier; Q1, the first triode; Q2, the second triode; OUT, signal output part; VCC, reference level.
Embodiment
With reference to Fig. 1, the signal input part IN of the utility model embodiment is connected to the positive input of the first amplifier A1 by the first resistance R1, reference level VCC is connected to the reverse input end of the first amplifier A1 by the second resistance R2, the reverse input end of the first amplifier A1 is connected to the output of the first amplifier A1 by the 3rd resistance R3, the positive input of the first amplifier A1 is by the 4th resistance R4 ground connection, the output of the first amplifier A1 is connected to the base stage of the first triode Q1 by the 5th resistance R5, signal input part IN is connected to the collector electrode of the first triode Q1 by the 6th resistance R6, the emitter of the first triode Q1 passes through the 7th resistance R7 and the 8th resistance R8 ground connection of series connection, the collector electrode of the first triode Q1 is connected to the reverse input end of the second amplifier A2 by the first electric capacity C1, the positive input of the second amplifier A2 is by the 9th resistance R9 ground connection, the output of the second amplifier A2 is connected to the collector electrode of the second triode Q2 by the tenth resistance R10, the reverse input end of the second amplifier A2 is connected to the output of the second amplifier A2 by the 11 resistance R11, the base stage of the second triode Q2 is connected between the 7th resistance R7 and the 8th resistance R8, the emitter of the second triode Q2 is connected to signal output part OUT, signal output part OUT is by the second electric capacity C2 ground connection.
Wherein, first resistance R1 is 100k Ω, second resistance R2 is 200k Ω, and the 3rd resistance R3 is 70k Ω, and the 4th resistance R4 is 300k Ω, 5th resistance R5 is 150k Ω, the 6th resistance R6 is 120k Ω, 7th resistance R7 is 200k Ω, and the 8th resistance R8 is 400k Ω, and the 9th resistance R9 is 200k Ω, tenth resistance R10 is 50k Ω, and the 11 resistance R11 is 90k Ω.First electric capacity C1 is 100 μ F, and the second electric capacity C2 is 450 μ F, reference level VCC is 12V.
By this circuit in parallel on the communication line of RS485 transceiver, can the voltage fluctuation exceeding transceiver common-mode signal be compensated in time, ensure the reliability of RS485 communicating circuit.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (1)
1. the RS485 communicating circuit improved, it is characterized in that: signal input part (IN) is connected to the positive input of the first amplifier (A1) by the first resistance (R1), reference level (VCC) is connected to the reverse input end of the first amplifier (A1) by the second resistance (R2), the reverse input end of the first amplifier (A1) is connected to the output of the first amplifier (A1) by the 3rd resistance (R3), the positive input of the first amplifier (A1) is by the 4th resistance (R4) ground connection, the output of the first amplifier (A1) is connected to the base stage of the first triode (Q1) by the 5th resistance (R5), signal input part (IN) is connected to the collector electrode of the first triode (Q1) by the 6th resistance (R6), the emitter of the first triode (Q1) passes through the 7th resistance (R7) and the 8th resistance (R8) ground connection of series connection, the collector electrode of the first triode (Q1) is connected to the reverse input end of the second amplifier (A2) by the first electric capacity (C1), the positive input of the second amplifier (A2) is by the 9th resistance (R9) ground connection, the output of the second amplifier (A2) is connected to the collector electrode of the second triode (Q2) by the tenth resistance (R10), the reverse input end of the second amplifier (A2) is connected to the output of the second amplifier (A2) by the 11 resistance (R11), the base stage of the second triode (Q2) is connected between the 7th resistance (R7) and the 8th resistance (R8), the emitter of the second triode (Q2) is connected to signal output part (OUT), signal output part (OUT) is by the second electric capacity (C2) ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520529686.3U CN204794962U (en) | 2015-07-21 | 2015-07-21 | Modified RS485 communication circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520529686.3U CN204794962U (en) | 2015-07-21 | 2015-07-21 | Modified RS485 communication circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204794962U true CN204794962U (en) | 2015-11-18 |
Family
ID=54534931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520529686.3U Expired - Fee Related CN204794962U (en) | 2015-07-21 | 2015-07-21 | Modified RS485 communication circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204794962U (en) |
-
2015
- 2015-07-21 CN CN201520529686.3U patent/CN204794962U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151118 Termination date: 20190721 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |