CN205910692U - Support parallelly connected RS232 interface transmitting circuit - Google Patents
Support parallelly connected RS232 interface transmitting circuit Download PDFInfo
- Publication number
- CN205910692U CN205910692U CN201620700388.0U CN201620700388U CN205910692U CN 205910692 U CN205910692 U CN 205910692U CN 201620700388 U CN201620700388 U CN 201620700388U CN 205910692 U CN205910692 U CN 205910692U
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- Prior art keywords
- triode
- transmitter
- diode
- pull down
- down resistor
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Abstract
The utility model relates to a support parallelly connected RS232 interface transmitting circuit, a serial communication port, include: diode D1, it is anodal connects the output that RS232 sent ware U1, diode D1's negative output to an output connector pin, triode Q1, its base is passed through current -limiting resistor R1 and is connected RS232 sends ware U1's output, triode Q1's projecting pole is connected to an output connector pin, triode Q1's collecting electrode is connected to the negative supply through pull down resistor R2. The beneficial effects of the utility model are that: the problem of RS232 does not support parallelly connected sending is solved, can realize the signal transmission of two computers to a computer, utilize diode unidirectional flux principle to realize the parallelly connected high logic of sending, adopt the negative supply to realize the drive that the level is low, adopt the triode circuit to solve the overweight problem of load.
Description
Technical field
The utility model is related to a kind of rs232 interface transtation mission circuit supporting parallel connection.
Background technology
Rs232 interface (rs232 is the interface standard of the serial data communication that Electronic Industries alliance (eia) formulates) is
A kind of point-to-point communication interface of serial, is generally used for logical between computer and computer or computer and data terminal
News.Some special applications need carry out 2 communications to 1 using rs232 interface, but because rs232 does not support directly
Connect communication in parallel, be rs232 to be converted to rs485 (rs485 is a kind of to support that what multiple spot interconnected connects compared with widespread practice at present
Mouthful) after carry out Mulit-point Connection and be reconverted into rs232 being communicated.But because rs485 is half duplex communication bus, this kind of mode meeting
Cause the conflict of bus.
Utility model content
For weak point present in the problems referred to above, the utility model provides a kind of rs232 interface supporting parallel connection to send out
Power transmission road, solves the problems, such as that rs232 does not support transmission in parallel.
For achieving the above object, the utility model provides a kind of rs232 interface transtation mission circuit supporting parallel connection, comprising:
Diode d1, its positive pole connects the output end of rs232 transmitter u1, and the negative pole of described diode d1 exports first
Out connector pin；
Triode q1, its base stage connects the output end of described rs232 transmitter u1, described triode by current-limiting resistance r1
The emitter stage of q1 is connected to described first out connector pin, and the colelctor electrode of described triode q1 is connected by pull down resistor r2
To negative supply.
Improve further as the utility model, also include:
Diode d2, its positive pole connects the output end of rs232 transmitter u2, and the negative pole of described diode d2 exports second
Out connector pin；
Triode q2, its base stage connects the output end of described rs232 transmitter u3, described triode by current-limiting resistance r4
The emitter stage of q3 is connected to described second out connector pin, and the colelctor electrode of described triode q2 is connected by pull down resistor r3
To negative supply.
Improve further as the utility model, also include: rs232 transmitter u3, described first out connector pin,
Described second out connector pin is connected with the input of described rs232 transmitter u3.
Improve further as the utility model, in described rs232 transmitter u3, be provided with the pull down resistor of 3～7k.
Improve further as the utility model, described triode q1 is pnp triode.
Improve further as the utility model, described triode q2 is pnp triode.
As the utility model preferably, the resistance of described current-limiting resistance r1 is 402k, the resistance of described pull down resistor r2
For 8.06k.
As the utility model preferably, the resistance of described current-limiting resistance r4 is 402k, the resistance of described pull down resistor r3
For 8.06k.
The beneficial effects of the utility model are:
1st, solve the problems, such as that rs232 does not support transmission in parallel, it is possible to achieve two computers signal to a computer
Send；
2nd, diode unilateral conduction principle is utilized to realize the high logic of transmission in parallel；
3rd, the low driving of level is realized using negative supply；
4th, overload is solved the problems, such as using transistor circuit.
Brief description
Fig. 1 is a kind of signal of the rs232 interface transtation mission circuit supporting parallel connection described in the utility model first embodiment
Figure；
Fig. 2 is a kind of signal of the rs232 interface transtation mission circuit supporting parallel connection described in the utility model second embodiment
Figure.
Specific embodiment
Embodiment 1, as shown in figure 1, send for a kind of rs232 interface supporting parallel connection of the utility model first embodiment
Circuit, including diode d1, triode q1, current-limiting resistance r1 and pull down resistor r2.The positive pole of diode d1 connects in computer 1
The output end of the rs232 transmitter u1 in portion, the negative pole of diode d1 exports the first out connector pin.The base of triode q1
Pole connects the output end of rs232 transmitter u1 by current-limiting resistance r1, and the emitter stage of triode q1 is connected to the first output and connects
Device pin, the colelctor electrode of triode q1 is connected to negative supply by pull down resistor r2.
Embodiment 2, as shown in Fig. 2 send for a kind of rs232 interface supporting parallel connection of the utility model second embodiment
Circuit.Difference from Example 1 is, also include diode d2, triode q2, current-limiting resistance r3, pull down resistor r4 and
Rs232 transmitter u3.The positive pole of diode d2 connects the output end of the rs232 transmitter u2 within computer 2, diode d2's
Negative pole exports the second out connector pin.The base stage of triode q2 connects rs232 transmitter u3's by current-limiting resistance r4
Output end, the emitter stage of triode q3 is connected to the second out connector pin, and the colelctor electrode of triode q2 passes through pull down resistor
R3 is connected to negative supply.First out connector pin, the second out connector pin and the rs232 within computer 3 send
The input of device u3 connects.
Wherein, it is provided with the pull down resistor of 3～7k in rs232 transmitter u3.Triode q1 is pnp triode.Triode q2
For pnp triode.The resistance of current-limiting resistance r1 is 402k, and the resistance of pull down resistor r2 is 8.06k.The resistance of current-limiting resistance r4 is
The resistance of 402k, pull down resistor r3 is 8.06k.
When specifically used, output end is connected to the input of computer 3 by computer 1 and computer 2.
When computer 1 and computer 2 all non-sending signals, the output end of rs232 transmitter u1, rs232 transmitter u2
Be less than -5v, diode d1 by, and triode q1 and triode q2 conducting, the input of computer 3 by pull down resistor r2 and under
The pull down resistor of pull-up resistor r3 and the internal 3～7k of rs232 transmitter u3 is drop-down, and the now input of rs232 transmitter u3 is low
Level.
When computer 1 send high level signal when, and computer 2 not sending signal when, rs232 transmitter u1 transmission electricity
Flat more than+5v, diode d1 turns on, and triode q1 is by diode d2 is by triode q2 turns on.Rs232 transmitter u1 sends out
Send driving rin and pull down resistor r3, then rin is high level.Wherein triode q1 is by being to reduce rs232 transmitter u1
Driving load, prevents from leading to low voltage because of overload.
When computer 2 send high level signal when, and computer 1 not sending signal when, rs232 transmitter u2 transmission electricity
Flat more than+5v, diode d2 turns on, and triode q2 is by diode d1 is by triode q1 turns on.Rs232 transmitter u2 sends out
Send driving rin and pull down resistor r2, then rin is high level.Wherein triode q2 is by being to reduce rs232 transmitter u2
Driving load, prevents from leading to low voltage because of overload.
When computer 1 and computer 2 send high level signal, diode d1, triode q1, diode d2, three poles simultaneously
Pipe q2 turns on.Rs232 transmitter u1 and rs232 transmitter u2 simultaneously drives rin and pull down resistor r2, pull down resistor r3, now
Rin is high level.
The signal to a computer for two computers can be realized using rs232 interface transtation mission circuit of the present utility model
Send.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for this
For the technical staff in field, the utility model can have various modifications and variations.All of the present utility model spirit and principle
Within, any modification, equivalent substitution and improvement made etc., should be included within protection domain of the present utility model.
Claims (8)
1. a kind of rs232 interface transtation mission circuit supporting parallel connection is it is characterised in that include:
Diode d1, its positive pole connects the output end of rs232 transmitter u1, and the negative pole of described diode d1 exports the first output
Connector pinout；
Triode q1, its base stage connects the output end of described rs232 transmitter u1 by current-limiting resistance r1, described triode q1's
Emitter stage is connected to described first out connector pin, and the colelctor electrode of described triode q1 is connected to negative by pull down resistor r2
Power supply.
2. rs232 interface transtation mission circuit according to claim 1 is it is characterised in that also include:
Diode d2, its positive pole connects the output end of rs232 transmitter u2, and the negative pole of described diode d2 exports the second output
Connector pinout；
Triode q2, its base stage connects the output end of described rs232 transmitter u3 by current-limiting resistance r4, described triode q3's
Emitter stage is connected to described second out connector pin, and the colelctor electrode of described triode q2 is connected to negative by pull down resistor r3
Power supply.
3. rs232 interface transtation mission circuit according to claim 2 is it is characterised in that also include: rs232 transmitter u3, institute
State the first out connector pin, described second out connector pin is connected with the input of described rs232 transmitter u3.
4. rs232 interface transtation mission circuit according to claim 3 is it is characterised in that be provided with described rs232 transmitter u3
The pull down resistor of 3～7k.
5. rs232 interface transtation mission circuit according to claim 1 is it is characterised in that described triode q1 is pnp tri- pole
Pipe.
6. rs232 interface transtation mission circuit according to claim 2 is it is characterised in that described triode q2 is pnp tri- pole
Pipe.
7. rs232 interface transtation mission circuit according to claim 1 is it is characterised in that the resistance of described current-limiting resistance r1 is
The resistance of 402k, described pull down resistor r2 is 8.06k.
8. rs232 interface transtation mission circuit according to claim 2 is it is characterised in that the resistance of described current-limiting resistance r4 is
The resistance of 402k, described pull down resistor r3 is 8.06k.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620700388.0U CN205910692U (en) | 2016-07-05 | 2016-07-05 | Support parallelly connected RS232 interface transmitting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620700388.0U CN205910692U (en) | 2016-07-05 | 2016-07-05 | Support parallelly connected RS232 interface transmitting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205910692U true CN205910692U (en) | 2017-01-25 |
Family
ID=57804691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620700388.0U Expired - Fee Related CN205910692U (en) | 2016-07-05 | 2016-07-05 | Support parallelly connected RS232 interface transmitting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205910692U (en) |
-
2016
- 2016-07-05 CN CN201620700388.0U patent/CN205910692U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170125 Termination date: 20170705 |