CN204331717U - A kind of distant signal Serial Port Transmission device - Google Patents
A kind of distant signal Serial Port Transmission device Download PDFInfo
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- CN204331717U CN204331717U CN201420835745.5U CN201420835745U CN204331717U CN 204331717 U CN204331717 U CN 204331717U CN 201420835745 U CN201420835745 U CN 201420835745U CN 204331717 U CN204331717 U CN 204331717U
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Abstract
The utility model provides a kind of distant signal Serial Port Transmission device, RS232 interface signal is converted to RS485 interface signal, realizes remote signal transmission.The utility model comprises RS232 input port, RS232 level shifting circuit, RS485 circuit and RS485 output port, RS232 level shifting circuit is connected with RS485 circuit (3) electric signal, RS485 output port is connected with RS485 circuit electric signal, and RS232 input port is connected with RS232 level shifting circuit electric signal.RS232 level shifting circuit reads in signal from RS232 input port, and after level conversion, input RS485 circuit, signal is exported distant signal Serial Port Transmission device by RS485 output port by RS485 circuit.The utility model can realize distant signal transmission; Structure is simple, is convenient to install and promote.
Description
Technical field:
The present invention relates to a kind of rs 232 serial interface signal transmitter, particularly a kind of distant signal Serial Port Transmission device.
Background technology:
Require communication distance be tens meters on km time, extensively adopt RS-485 serial bus standard.RS-485 adopts balance to send and differential received, therefore has the ability suppressing common mode interference.Add that bus transceiver has high sensitivity, can the voltage being low to moderate 200mV be detected, therefore signal transmission can be restored beyond km.On market, general RS-485 adopts half-duplex operation, and any whenever can only be had to be in transmission state, and therefore, transtation mission circuit must be controlled by enable signal.RS-485, for very convenient during multi-point interconnection, can save many signal wires.Application RS-485 can network formation distributed system, and it allows 32 drivers in parallel at most and 32 receivers.
Common twisted-pair feeder can be adopted in low speed, short distance, glitch-free occasion, otherwise, when high speed, Long line transmission, then must adopt the RS485 private cable (STP-120 Ω (for RS485 & CAN) one pair 18 AWG) of impedance matching (being generally 120 Ω), and also should adopt armored type paired shield cable (ASTP-120 Ω (for RS485 & CAN) one pair 18 AWG) under interference rugged environment.When using RS485 interface, for specific transmission line, the baud rate that its data-signal transmits maximum cable length and the Signal transmissions allowed from RS485 interface to load is inversely proportional to, and this length data mainly affected by distorted signals and noise etc.In theory, traffic rate 100Kbps and following time, the most longer transmission distance of RS485 can reach 1200 meters, but the distance transmitted in actual applications is also because of the transport property of chip and cable and institute's difference.The method increasing relaying can be adopted in transmitting procedure to amplify signal, and can add at most eight relayings, that is the maximum transmission distance of RS485 can reach 10.8 kilometers in theory.
Due to give tacit consent to as the PC of signal sending end only with RS232 interface, be therefore necessary to propose a kind of distant signal Serial Port Transmission device by RS232/RS485 change-over circuit, PC serial ports RS232 signal being converted to RS485 signal.
Utility model content:
The utility model provides a kind of distant signal Serial Port Transmission device, mainly comprise RS232 input port, RS232 level shifting circuit, RS485 circuit and RS485 output port, RS232 level shifting circuit is connected with RS485 circuit electric signal, RS485 output port is connected with RS485 circuit electric signal, and RS232 input port is connected with RS232 level shifting circuit electric signal.
Distant signal Serial Port Transmission device circuit is by RS232 converter U1, RS485 converter U2, electric capacity C1, C2, C3, resistance R1, R2, R3, R4, triode Q1 form, and the model of RS232 converter U1 is the model of HIN232, RS485 converter U2 is MAX485, and the two ends of electric capacity C1 connect the 1st of RS232 converter U1 the respectively, 3 pins, electric capacity C2 one end connects the 2nd pin of RS232 converter U1, and the other end connects positive source, and the two ends of electric capacity C3 connect the 4th of RS232 converter U1 the respectively, 5 pins, electric capacity C4 one end connects the 6th pin of RS232 converter U1, and the other end connects power cathode, the 14th of RS232 converter U1, 13 pins connect the D0 of RS232 input port respectively, D1 pin, the 8th of RS232 converter U1, 13 pins are interconnected, the 11st of RS232 converter U1, 12 pins connect the 1st of RS485 converter U2 the respectively, 4 pins, the 2nd of RS485 converter U2, 3 pins are interconnected, resistance R1 one end connects positive source, the emitter of other end connecting triode Q1, the emitter of triode Q1 connects the 2nd pin of RS485 converter U2, resistance R2 one end connects the 9th pin of RS232 converter U1, the base stage of other end connecting triode Q1, the 6th of RS485 converter U2, 7 pins connect the A of RS485 output port respectively, B pin, resistance R3 one end connects positive source, and the other end connects the 7th pin of RS485 converter U2, and resistance R4 one end connects power cathode, and the other end connects the 6th pin of RS485 converter U2.
The beneficial effects of the utility model: 1. can realize distant signal transmission; 2. structure is simple, is convenient to install and promote.
Accompanying drawing illustrates:
For ease of illustrating, the utility model is described in detail by following concrete enforcement and accompanying drawing;
Fig. 1 the utility model system schematic;
Fig. 2 the utility model circuit diagram;
In figure: 1-RS232 input port 2-RS232 level shifting circuit 3-RS485 circuit 4-RS485 output port.
Embodiment:
For making the purpose of this utility model, technical scheme and advantage clearly understand, below by the specific embodiment shown in accompanying drawing, the utility model is described.But should be appreciated that, these describe just exemplary, and do not really want to limit scope of the present utility model.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present utility model.
A kind of distant signal Serial Port Transmission device, it is characterized in that, comprise RS232 input port, RS232 level shifting circuit, RS485 circuit and RS485 output port, RS232 level shifting circuit is connected with RS485 circuit (3) electric signal, RS485 output port is connected with RS485 circuit electric signal, and RS232 input port is connected with RS232 level shifting circuit electric signal.
Above-mentioned a kind of distant signal Serial Port Transmission device circuit is by RS232 converter U1, RS485 converter U2, electric capacity C1, C2, C3, resistance R1, R2, R3, R4, triode Q1 form, and the model of RS232 converter U1 is the model of HIN232, RS485 converter U2 is MAX485, and the two ends of electric capacity C1 connect the 1st of RS232 converter U1 the respectively, 3 pins, electric capacity C2 one end connects the 2nd pin of RS232 converter U1, and the other end connects positive source, and the two ends of electric capacity C3 connect the 4th of RS232 converter U1 the respectively, 5 pins, electric capacity C4 one end connects the 6th pin of RS232 converter U1, and the other end connects power cathode, the 14th of RS232 converter U1, 13 pins connect the D0 of RS232 input port respectively, D1 pin, the 8th of RS232 converter U1, 13 pins are interconnected, the 11st of RS232 converter U1, 12 pins connect the 1st of RS485 converter U2 the respectively, 4 pins, the 2nd of RS485 converter U2, 3 pins are interconnected, resistance R1 one end connects positive source, the emitter of other end connecting triode Q1, the emitter of triode Q1 connects the 2nd pin of RS485 converter U2, resistance R2 one end connects the 9th pin of RS232 converter U1, the base stage of other end connecting triode Q1, the 6th of RS485 converter U2, 7 pins connect the A of RS485 output port respectively, B pin, resistance R3 one end connects positive source, and the other end connects the 7th pin of RS485 converter U2, and resistance R4 one end connects power cathode, and the other end connects the 6th pin of RS485 converter U2.
Utility model works process is: RS232 level shifting circuit reads in signal from RS232 input port, and after level conversion, input RS485 circuit, signal is exported distant signal Serial Port Transmission device by RS485 output port by RS485 circuit.
More than show and describe ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and instructions 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. a distant signal Serial Port Transmission device, mainly comprise RS232 input port (1), RS232 level shifting circuit (2), RS485 circuit (3) and RS485 output port (4), RS232 level shifting circuit (2) is connected with RS485 circuit (3) electric signal, RS485 output port (4) is connected with RS485 circuit (3) electric signal, RS232 input port (1) is connected with RS232 level shifting circuit (2) electric signal, it is characterized in that, distant signal Serial Port Transmission device circuit is by RS232 converter U1, RS485 converter U2, electric capacity C1, C2, C3, resistance R1, R2, R3, R4, triode Q1 forms, the model of RS232 converter U1 is HIN232, the model of RS485 converter U2 is MAX485,
The two ends of electric capacity C1 connect respectively RS232 converter U1 the 1st, 3 pins,
Electric capacity C2 one end connects the 2nd pin of RS232 converter U1, and the other end connects positive source,
The two ends of electric capacity C3 connect respectively RS232 converter U1 the 4th, 5 pins,
Electric capacity C4 one end connects the 6th pin of RS232 converter U1, and the other end connects power cathode,
RS232 converter U1 the 14th, 13 pins connect D0, D1 pin of RS232 input port (1) respectively,
RS232 converter U1 the 8th, 13 pins are interconnected,
RS232 converter U1 the 11st, 12 pins connect respectively RS485 converter U2 the 1st, 4 pins,
RS485 converter U2 the 2nd, 3 pins are interconnected,
Resistance R1 one end connects positive source, the emitter of other end connecting triode Q1,
The emitter of triode Q1 connects the 2nd pin of RS485 converter U2,
Resistance R2 one end connects the 9th pin of RS232 converter U1, the base stage of other end connecting triode Q1,
RS485 converter U2 the 6th, 7 pins connect A, B pin of RS485 output port (4) respectively,
Resistance R3 one end connects positive source, and the other end connects the 7th pin of RS485 converter U2,
Resistance R4 one end connects power cathode, and the other end connects the 6th pin of RS485 converter U2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420835745.5U CN204331717U (en) | 2014-12-25 | 2014-12-25 | A kind of distant signal Serial Port Transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420835745.5U CN204331717U (en) | 2014-12-25 | 2014-12-25 | A kind of distant signal Serial Port Transmission device |
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| Publication Number | Publication Date |
|---|---|
| CN204331717U true CN204331717U (en) | 2015-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420835745.5U Expired - Fee Related CN204331717U (en) | 2014-12-25 | 2014-12-25 | A kind of distant signal Serial Port Transmission device |
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| Country | Link |
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| CN (1) | CN204331717U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629833A (en) * | 2015-12-31 | 2016-06-01 | 天津朗誉科技发展有限公司 | Tracking sensor module |
-
2014
- 2014-12-25 CN CN201420835745.5U patent/CN204331717U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629833A (en) * | 2015-12-31 | 2016-06-01 | 天津朗誉科技发展有限公司 | Tracking sensor module |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20150513 Termination date: 20191225 |
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| CF01 | Termination of patent right due to non-payment of annual fee |