CN2879549Y - Non-polar 485 communication circuit - Google Patents
Non-polar 485 communication circuit Download PDFInfo
- Publication number
- CN2879549Y CN2879549Y CN 200620003503 CN200620003503U CN2879549Y CN 2879549 Y CN2879549 Y CN 2879549Y CN 200620003503 CN200620003503 CN 200620003503 CN 200620003503 U CN200620003503 U CN 200620003503U CN 2879549 Y CN2879549 Y CN 2879549Y
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- chip
- triode
- communication
- power
- poles
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- Expired - Fee Related
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Abstract
The utility model relates to a non-polar 485 communication circuit including a communication circuit with 485U1 chip at whose both ends 485 U2 chips is parallel connected, wherein the 485U2 chip is crossed connected with two poles A, B of the 485 bus of the 485U1 chip, and the power control circuit provides working power for the 485U1 chip or 485U2 chip via audions. When the two poles of the 485 bus is positively connected, the 485U1 chip will working to allow the 485 communication between the equipments; when the two poles is inverted connected, the communication equipment will determine communication codes to form correct 485 polarity state, then the control terminal KZ of the power control circuit provides electrical level, and the audions provides the 485U2 chip with working power as well as cut off the working power of the 485U1 chip, so as to allow the 485 communication between the equipments. The utility model has simple structure, good reliability, and is practical and convenient.
Description
Affiliated technical field
The utility model relates to a kind of 485 telecommunication circuits, especially a kind of nonpolarity 485 telecommunication circuits.
Background technology
485 buses of tradition 485 telecommunication circuits have the branch of A, B polarity, instrument and equipment at the scene during wiring easily with the polarity wrong, can't realize normal communication function, influence the overall performance of instrument and equipment, bring more inconvenience to use.
Summary of the invention
The purpose of this utility model is to provide a kind of non-polar 485 telecommunication circuits, and it has overcome the deficiencies in the prior art.
The purpose of this utility model is achieved in that and comprises the telecommunication circuit with the one 485 chip, it is characterized in that, the 2 485 chip that also comprises GND end ground connection, has first triode, the power control circuit of second triode and control end, the mutual interconnection in the two poles of the earth of 485 buses of described the 2 485 chip and above-mentioned the one 485 chip, described the 2 485 chip is connected with the sending and receiving end of above-mentioned the one 485 chip is parallel with one another, the power end of described the one 485 chip is connected to the collector electrode of described first triode, the power end of described the 2 485 chip is connected to the emitter of second triode (P3), the base stage of described first triode and second triode is connected to above-mentioned control end by resistance respectively, the collector electrode of the emitter of described first triode and described second triode is ground connection respectively, and described control end passes through grounding through resistance.
The beneficial effects of the utility model are: 485 buses that realize 485 telecommunication circuits are nonpolarity, simple in structure, wiring practicality, convenience, good reliability.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is an operation principle schematic diagram of the present utility model.
Among the figure: I. has the telecommunication circuit of 485 chips; II. power control circuit.
Embodiment
Nonpolarity 485 telecommunication circuits of the present utility model, comprise telecommunication circuit I with the one 485 chip 485U1, as shown in Figure 1, the 2 485 chip 485U2 that also comprises GND end ground connection, has the first triode P2, the power control circuit II of the second triode P3 and control end KZ, the A of 485 buses of 485U2 chip and 485U1 chip, the mutual interconnection in B the two poles of the earth, it is the B utmost point of the A utmost point connection 485U2 of 485U1, the B utmost point of 485U1 connects the A utmost point of 485U2, the sending and receiving end DI of 485U2 and 485U1, DE, RE, RO connection parallel with one another, the power end of 485U1 chip is connected to the collector electrode of triode P2, and the base stage of this triode is connected to control end KZ by resistance R 6; The power end of 485U2 chip is connected to the emitter of triode P3, and the base stage of this triode is connected to control end KZ by resistance R 7, and the collector electrode of the emitter of triode P2 and triode P3 is ground connection respectively, and control end KZ is by resistance R 5 ground connection.
When A, B are just connecing,, realize 485 communications between instrument and equipment by 485U1 work; When A, B connect inverse time, judge communications codes by communication equipment, form 485 correct polarization state, control end KZ by power control circuit provides level, provide working power by triode P3 for 485U2, cut off the working power of 485U1 simultaneously by triode P2, realize 485 communications between instrument and equipment.For instrument and equipment, no matter 485 buses are just connecing with reversal connection can be realized that all 485 communicate by letter like this.Realized nonpolarity 485 telecommunication circuits thus, use this circuit after, user's wiring arbitrarily when 485 wiring, and need not to consider polarity.
Claims (1)
1, a kind of nonpolarity 485 telecommunication circuits, comprise telecommunication circuit (I) with the one 485 chip (485U1), it is characterized in that, the 2 485 chip (485U2) that also comprises GND end ground connection, has first triode (P2), the power control circuit (II) of second triode (P3) and control end (KZ), the mutual interconnection in the two poles of the earth of 485 buses of described the 2 485 chip (485U2) and above-mentioned the one 485 chip (485U1), the parallel with one another connection of sending and receiving end of described the 2 485 chip (485U2) and above-mentioned the one 485 chip (485U1), the power end of described the one 485 chip (485U1) is connected to the collector electrode of described first triode (P2), the power end of described the 2 485 chip (485U2) is connected to the emitter of second triode (P3), the base stage of described first triode (P2) and second triode (P3) is connected to above-mentioned control end (KZ) by resistance respectively, the collector electrode of the emitter of described first triode (P2) and described second triode (P3) is ground connection respectively, and described control end (KZ) passes through grounding through resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620003503 CN2879549Y (en) | 2006-01-24 | 2006-01-24 | Non-polar 485 communication circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620003503 CN2879549Y (en) | 2006-01-24 | 2006-01-24 | Non-polar 485 communication circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2879549Y true CN2879549Y (en) | 2007-03-14 |
Family
ID=37861967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620003503 Expired - Fee Related CN2879549Y (en) | 2006-01-24 | 2006-01-24 | Non-polar 485 communication circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2879549Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011057538A1 (en) * | 2009-11-12 | 2011-05-19 | Liu Aimin | Non-polarity 485 chip |
| CN103323737A (en) * | 2013-06-13 | 2013-09-25 | 国家电网公司 | RS-485 interface polarity detecting method and system based on electric energy meter communication protocol |
-
2006
- 2006-01-24 CN CN 200620003503 patent/CN2879549Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011057538A1 (en) * | 2009-11-12 | 2011-05-19 | Liu Aimin | Non-polarity 485 chip |
| CN103323737A (en) * | 2013-06-13 | 2013-09-25 | 国家电网公司 | RS-485 interface polarity detecting method and system based on electric energy meter communication protocol |
| CN103323737B (en) * | 2013-06-13 | 2016-04-20 | 国家电网公司 | Based on electric energy meter communication protocol RS-485 interface polarity detection method and system thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 226200 Jiangsu city in Qidong Province Economic Development Zone No. 666 Lin Yang Lu Patentee after: Jiangsu Linyang Electronics Co., Ltd. Address before: 226200 No. 1259 Renmin West Road, Jiangsu, Qidong Patentee before: Linyang Electronics Co., Ltd., Jiangsu |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070314 Termination date: 20150124 |
|
| EXPY | Termination of patent right or utility model |