CN201878160U - Half-duplex three-wire system communication circuit - Google Patents
Half-duplex three-wire system communication circuit Download PDFInfo
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- CN201878160U CN201878160U CN2010205900723U CN201020590072U CN201878160U CN 201878160 U CN201878160 U CN 201878160U CN 2010205900723 U CN2010205900723 U CN 2010205900723U CN 201020590072 U CN201020590072 U CN 201020590072U CN 201878160 U CN201878160 U CN 201878160U
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- optocoupler
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- needle stand
- single needle
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Abstract
The utility model discloses a half-duplex three-wire system communication circuit, which comprises a single-row pin seat J1. A first pin of the single-row pin seat J1 is connected with a power source, a third pin of the single-row pin seat J1 is grounded, a polar capacitor C1 and a normal capacitor C2 are connected between the first pin and the third pin of the single-row pin seat J1 in a bridging manner, a second pin of the single-row pin seat J1 is connected with an output terminal of an optical coupler IC1, and an input terminal of the optical coupler IC1 is connected with an input/output port P1.0 of a control chip through a resistor R1; and the second pin of the single-row pin seat J1 is further connected with an input terminal of another optical coupler IC2 through a resistor R2, an output terminal of the optical coupler IC2 is connected with a pull-up resistor R3, and a wiring terminal is led out from the optical coupler IC2 and connected to another input/output port P1.1 of the control chip. The half-duplex three-wire system communication circuit has the advantages of simple structure and convenience for use.
Description
Technical field
The utility model relates to a kind of application circuit, is specifically related to a kind of half-duplex three-wire system telecommunication circuit.
Background technology
In the existing half-duplex three-wire system telecommunication circuit, but most complex structure, and baroque resistance one side cost can increase, in addition on the one hand, after circuit structure was in a single day complicated, its destabilizing factor was behind so just reducing product percent of pass virtually also increasing.
The utility model content
For overcoming deficiency of the prior art, the purpose of this utility model is to provide a kind of half-duplex three-wire system telecommunication circuit simple in structure.
In order to solve the problems of the technologies described above, realize above-mentioned purpose, the utility model has adopted following technical scheme:
A kind of half-duplex three-wire system telecommunication circuit, comprise a single needle stand J1, first pin of described single needle stand J1 connects power supply, the 3rd pin ground connection of described single needle stand J1, cross-over connection has polar capacitor C1 and common electric capacity C2 between first pin of described single needle stand J1 and the 3rd pin, second pin of described single needle stand J1 connects the output of an optocoupler IC1, and described optocoupler IC1 one input connects an input/output port P1.0 of a control chip by a resistance R 1; Second pin of described single needle stand J1 also is connected with the input of another optocoupler IC2 by a resistance R 2, the output of described optocoupler IC2 connects a pull-up resistor R3, and draws another input/output port P1.1 that terminals are connected described control chip.
Further, another input of another input of described optocoupler IC1 and described optocoupler IC2 connects power supply after interconnected; Another output of described optocoupler IC1 and another output of described optocoupler IC2 be ground connection all.
The course of work of half-duplex three-wire system telecommunication circuit of the present utility model is as follows:
When the input/output port P1.0 of control chip sent a low level " 0 ", the current potential of second pin of the then single needle stand J1 of optocoupler IC1 conducting was dragged down, thus the second pin output low level of single needle stand J1.Because the conducting of optocoupler IC1 then optocoupler IC2 also is switched on, and makes the input/output port P1.1 current potential of control chip drag down " 0 ".When the input/output port P1.0 when control chip sent a high level " 1 ", optocoupler IC1 ended, and the current potential of second pin of then single needle stand J1 is drawn high, thus the output high level of second pin of single needle stand J1.Optocoupler IC2 also ends because optocoupler IC1 ends then, makes the input/output port P1.1 current potential of control chip be drawn high " 1 ".
The utlity model has following advantage:
Half-duplex three-wire system telecommunication circuit of the present utility model is simple in structure, easy to use.
Above-mentioned explanation only is the general introduction of technical solutions of the utility model, for can clearer understanding technological means of the present utility model, and can be implemented according to the content of specification, below with preferred embodiment of the present utility model and conjunction with figs. describe in detail as after.Embodiment of the present utility model is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is the circuit theory diagrams of half-duplex three-wire system telecommunication circuit of the present utility model.
Number in the figure explanation: 1, first pin of single needle stand J1,2, second pin of single needle stand J1,3, the 3rd pin of single needle stand J1.
Embodiment
Below in conjunction with drawings and Examples technology implementation process of the present utility model is described further.
Referring to shown in Figure 1, a kind of half-duplex three-wire system telecommunication circuit, comprise a single needle stand J1, first pin 1 of described single needle stand J1 connects power supply, the 3rd pin 3 ground connection of described single needle stand J1, cross-over connection has polar capacitor C1 and common electric capacity C2 between first pin 1 of described single needle stand J1 and the 3rd pin 3, second pin 2 of described single needle stand J1 connects the output of an optocoupler IC1, and described optocoupler IC1 one input connects an input/output port P1.0 of a control chip by a resistance R 1; Second pin 2 of described single needle stand J1 also is connected with the input of another optocoupler IC2 by a resistance R 2, the output of described optocoupler IC2 connects a pull-up resistor R 3, and draws another input/output port P1.1 that terminals are connected described control chip.
Further, another input of another input of described optocoupler IC1 and described optocoupler IC2 connects power supply after interconnected; Another output of described optocoupler IC1 and another output of described optocoupler IC2 be ground connection all.
The foregoing description just is to allow the one of ordinary skilled in the art can understand content of the present utility model and enforcement according to this for technical conceive of the present utility model and characteristics being described, its objective is, can not limit protection range of the present utility model with this.The variation or the modification of every equivalence of having done according to the essence of the utility model content all should be encompassed in the protection range of the present utility model.
Claims (2)
1. half-duplex three-wire system telecommunication circuit, comprise a single needle stand J1, first pin (1) of described single needle stand J1 connects power supply, the 3rd pin (3) ground connection of described single needle stand J1, cross-over connection has polar capacitor C1 and common electric capacity C2 between first pin (1) of described single needle stand J1 and the 3rd pin (3), it is characterized in that: second pin (2) of described single needle stand J1 connects the output of an optocoupler IC1, and described optocoupler IC1 one input connects an input/output port P1.0 of a control chip by a resistance R 1; Second pin (2) of described single needle stand J1 also is connected with the input of another optocoupler IC2 by a resistance R 2, the output of described optocoupler IC2 connects a pull-up resistor R3, and draws another input/output port P1.1 that terminals are connected described control chip.
2. half-duplex three-wire system telecommunication circuit according to claim 1 is characterized in that: connect power supply after another input of described optocoupler IC1 and another input of described optocoupler IC2 are interconnected; Another output of described optocoupler IC1 and another output of described optocoupler IC2 be ground connection all.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205900723U CN201878160U (en) | 2010-11-03 | 2010-11-03 | Half-duplex three-wire system communication circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205900723U CN201878160U (en) | 2010-11-03 | 2010-11-03 | Half-duplex three-wire system communication circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201878160U true CN201878160U (en) | 2011-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205900723U Expired - Fee Related CN201878160U (en) | 2010-11-03 | 2010-11-03 | Half-duplex three-wire system communication circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201878160U (en) |
Cited By (1)
| 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 |
-
2010
- 2010-11-03 CN CN2010205900723U patent/CN201878160U/en not_active Expired - Fee Related
Cited By (1)
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20111103 |