CN204119205U - A kind of two optocoupler RS485 circuit - Google Patents
A kind of two optocoupler RS485 circuit Download PDFInfo
- Publication number
- CN204119205U CN204119205U CN201420618486.0U CN201420618486U CN204119205U CN 204119205 U CN204119205 U CN 204119205U CN 201420618486 U CN201420618486 U CN 201420618486U CN 204119205 U CN204119205 U CN 204119205U
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- China
- Prior art keywords
- circuit
- optocoupler
- signal transmitting
- triode
- transmitting units
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Abstract
The utility model is applicable to electric energy meter and manufactures field, provides a kind of two optocoupler RS485 circuit, comprising: RS485 chip, 485 signal receiving units and 485 signal transmitting units; The reception output of described RS485 chip is connected with described 485 signal receiving units, send enable control end to be connected with described 485 signal transmitting units with the enable control end of reception and transmission input, described 485 signal transmitting units comprise triode and optocoupler, access storage capacitor between the base stage of described triode and 485 circuit ground ends.By accessing storage capacitor in the base stage of triode and the earth terminal of 485 circuit, add voltage difference when A line and the switching of B line, thus enhance the driving force of RS485 circuit, the problem of mistake may be there is when solving RS485 circuit communication, improve communication success rate, and be applicable to completely, in polarity and non-polar RS485 circuit, functionally to substitute three optocoupler RS485 circuit completely, reduce costs.
Description
Technical field
The utility model belongs to electric energy meter and manufactures field, particularly relates to a kind of two optocoupler RS485 circuit.
Background technology
RS485 is a kind of industrial communication interface, adopts the combination of balance driver and differential receiver, and antijamming capability is comparatively strong, is widely used at present in electric energy meter hardware circuit.Generally use three optocouplers to control 485 chips in the conventional design circuit of electric energy meter RS485 circuit normally to work, according to two photoelectric coupled circuit, RS485 drives " 0 " signal is provided by the driving of its circuit self, when needs RS485 circuit provides " 1 " signal, by A, B port, power supply and resistance are over the ground pulled, driving force is poor, may occur that mistake appears in level conversion, causes RS485 communication to occur the problem of mistake.
Utility model content
The object of the utility model embodiment is to provide a kind of two optocoupler RS485 circuit, to solve prior art two optocoupler RS485 drives ability, easily occurs that the problem of mistake appears in level conversion.
The utility model embodiment is achieved in that a kind of two optocoupler RS485 circuit, comprising: RS485 chip, 485 signal receiving units and 485 signal transmitting units; The reception output of described RS485 chip is connected with described 485 signal receiving units, send enable control end to be connected with described 485 signal transmitting units with the enable control end of reception and transmission input, described 485 signal transmitting units comprise triode and optocoupler, access storage capacitor between the base stage of described triode and 485 circuit ground ends.
The beneficial effect of a kind of two optocoupler RS485 circuit that the utility model embodiment provides comprises: at the base stage of triode and the earth terminal access storage capacitor of 485 circuit, add voltage difference when A line and the switching of B line, thus enhance the driving force of RS485 circuit, the problem of mistake may be there is when solving RS485 circuit communication, improve communication success rate, and be applicable in polarity and non-polar RS485 circuit completely, functionally can substitute three optocoupler RS485 circuit completely, reduce costs.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of two optocoupler RS485 circuit that the utility model embodiment provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
In order to technical scheme described in the utility model is described, be described below by specific embodiment.
Be illustrated in figure 1 the structural representation of a kind of two optocoupler RS485 circuit that the utility model provides, described RS485 circuit comprises:
RS485 chip, 485 signal receiving units and 485 signal transmitting units; The reception output of RS485 chip is connected with 485 signal receiving units, send enable control end to be connected with 485 signal transmitting units with the enable control end of reception and transmission input, 485 signal transmitting units comprise triode and optocoupler, access storage capacitor between the base stage of triode and 485 circuit ground ends.
The utility model embodiment, at the base stage of triode and the earth terminal access storage capacitor of 485 circuit, add voltage difference when A line and the switching of B line, thus enhance the driving force of RS485 circuit, the problem of mistake may be there is when solving RS485 circuit communication, improve communication success rate, and be applicable in polarity and non-polar RS485 circuit completely, functionally can substitute three optocoupler RS485 circuit completely, reduce costs.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (1)
1. two optocoupler RS485 circuit, described circuit comprises: RS485 chip, 485 signal receiving units and 485 signal transmitting units; The reception output of described RS485 chip is connected with described 485 signal receiving units, send enable control end to be connected with described 485 signal transmitting units with the enable control end of reception and transmission input, described 485 signal transmitting units comprise triode and optocoupler, it is characterized in that, between the base stage of described triode and 485 circuit ground ends, access storage capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420618486.0U CN204119205U (en) | 2014-10-23 | 2014-10-23 | A kind of two optocoupler RS485 circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420618486.0U CN204119205U (en) | 2014-10-23 | 2014-10-23 | A kind of two optocoupler RS485 circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204119205U true CN204119205U (en) | 2015-01-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420618486.0U Expired - Fee Related CN204119205U (en) | 2014-10-23 | 2014-10-23 | A kind of two optocoupler RS485 circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204119205U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429122A (en) * | 2015-11-16 | 2016-03-23 | 国网山东省电力公司济宁供电公司 | Non-polar RS485 protective adapter circuit |
-
2014
- 2014-10-23 CN CN201420618486.0U patent/CN204119205U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429122A (en) * | 2015-11-16 | 2016-03-23 | 国网山东省电力公司济宁供电公司 | Non-polar RS485 protective adapter circuit |
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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: 20150121 Termination date: 20201023 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |