CN201114169Y - Serial communication interface isolation driver circuit - Google Patents
Serial communication interface isolation driver circuit Download PDFInfo
- Publication number
- CN201114169Y CN201114169Y CNU2007201554062U CN200720155406U CN201114169Y CN 201114169 Y CN201114169 Y CN 201114169Y CN U2007201554062 U CNU2007201554062 U CN U2007201554062U CN 200720155406 U CN200720155406 U CN 200720155406U CN 201114169 Y CN201114169 Y CN 201114169Y
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- serial communication
- reverser
- output
- photoelectrical coupler
- communication interface
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Abstract
The utility model relates to a communication interface circuit, in particular to a serial communication interface isolation driving circuit which can power on equipment on a serial bus online but cannot affect the bus in case of power supply failure. The circuit comprises a photoelectric coupler, a serial communication driving chip and a reverser, wherein an output of the photoelectric coupler is connected to an input terminal of the reverser, an output terminal of the reverser is connected with a direction control terminal of the serial communication driving chip, an input terminal and an output terminal of the photoelectric coupler adopt different power supplies so as to keep the direction control terminal of the serial communication driving chip in a receiving state at a low level and in a sending state at a high level. In case the input terminal of the photoelectric coupler was power-off or presents a high level during reset, the reverser reverses the output to a low level signal, forcing the communication direction of the serial communication driving chip to be in a receiving state so as to protect the serial communication network.
Description
Technical field
The utility model relates to a kind of communication interface circuit, particularly a kind of online serial communication interface isolated drive circuit that powers on and can not impact bus during power failure of equipment on the universal serial bus that makes.
Background technology
The half duplex series communication chip for driving is the chip that widely apply the communications field.With the RS485 communication interface is example, a kind of main application mode is: CPU communication direction control signal directly connects the direction control end of described RS485, the direction control end of RS485 all is to adopt the low level control chip to accept signal of communication, and high level control sends signal of communication.Because the same time can only allow a driving mouth to be in transmit status on the described RS485 bus, so all can not be in transmit status when device drives on the bus or fault, during particularly online connection device, because of the number of C PU rear port that resets presents high level state, and being high level, RS485 chip for driving direction control end is in transmit status, a plurality of equipment all are in transmit status on the bus so can cause when starting, thereby cause bus failure.
Another kind of main application mode is: the cpu power and the RS485 power supply that send control signal adopt photoelectrical coupler (hereinafter to be referred as optocoupler) to isolate, and the communication direction control signal that CPU sends is connected with the communication direction control signal of RS485 by optocoupler.After the CPU power down of sending end as direction control signal, the optocoupler output is a high level signal, makes RS485 be in transmit status, causes fault for too the RS485 bus.
The utility model content
The utility model has overcome above-mentioned shortcoming, provides that a kind of relatively simple for structure, bus apparatus is online to power on and serial communication interface isolated drive circuit that power failure can not impact bus.
The technical scheme in the invention for solving the technical problem is: a kind of serial communication interface isolated drive circuit, comprise photoelectrical coupler and serial communication chip for driving, the input of described photoelectrical coupler is used to receive the communication direction control signal that CPU sends, described universal serial bus is used for receiving the transmission bus signals, also comprise reverser, the output of described photoelectrical coupler is connected to the input of described reverser, the output of described reverser links to each other with the direction control end of described serial communication chip for driving, and the input of described photoelectrical coupler adopts different power supplys respectively with output.
The input of described photoelectrical coupler and described CPU can adopt same power supply, and the output of described photoelectrical coupler can adopt another identical power supply with described reverser, serial communication chip for driving.
Described serial communication chip for driving can be RS485 communication drivers chip.
Described photoelectrical coupler can be high-speed photoelectric coupler.
The utility model is provided with reverser by the output at photoelectrical coupler; be in accepting state when making the direction control end of serial communication chip for driving be low level; be in transmit status during high level; when the input of optocoupler and output are using under the different electrical power situation; if the input that optocoupler is connected with CPU be the power supply power-fail fault or when resetting the input of optocoupler present high level; the output of described optocoupler also is a high level; become low level signal through the reverse output of reverser; described low level signal forces the communication direction of described serial communication chip for driving to be in accepting state; serial communication bus is damaged, serial communication network is played significant protective effect.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
As shown in fig. 1, circuit theory diagrams for a kind of preferred embodiment of the utility model, what the serial communication chip for driving in the present embodiment adopted is the RS485 chip, wherein the communication direction control signal of CPU U4 links to each other with the input of a photoelectrical coupler U1 by the RT_Ctrl end, the output of described optocoupler U is connected to the input of a reverser U2, and the signal that described reverser U2 exports after with the signals reverse that receives is sent into the direction control end of described RS485 chip U3, the input of described CPU U4 and optocoupler U1 uses same power supply VCC, the output of optocoupler U1, reverser U2 and RS485 chip U3 then use another power supply VCC1.
According to said structure as can be known; since the output communication direction control signal of optocoupler U1 by reverser U2 oppositely the described RS485 U3 of back control side signal transmission to; therefore be in accepting state when making the direction control end of serial communication chip for driving be low level; be in transmit status during high level; when the input of optocoupler and output are using under the different electrical power situation; if the input that optocoupler is connected with CPU be the power supply power-fail fault or when resetting the input of optocoupler present high level; the output of described optocoupler also is a high level; become low level signal through the reverse output of reverser; described low level signal forces the communication direction of described serial communication chip for driving to be in accepting state; serial communication bus is damaged, serial communication network is played significant protective effect.
More than serial communication interface isolated drive circuit provided by the utility model is described in detail, used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (4)
1. serial communication interface isolated drive circuit, comprise photoelectrical coupler and serial communication chip for driving, the input of described photoelectrical coupler is used to receive the communication direction control signal that CPU sends, described universal serial bus is used for receiving, sending bus signals, it is characterized in that: also comprise reverser, the output of described photoelectrical coupler is connected to the input of described reverser, the output of described reverser links to each other with the direction control end of described serial communication chip for driving, and the input of described photoelectrical coupler adopts different power supplys respectively with output.
2. serial communication interface isolated drive circuit according to claim 1, it is characterized in that: the input of described photoelectrical coupler and described CPU adopt same power supply, and the output of described photoelectrical coupler adopts another identical power supply with described reverser, serial communication chip for driving.
3. serial communication interface isolated drive circuit according to claim 1 and 2 is characterized in that: described serial communication chip for driving is a RS485 communication drivers chip.
4. serial communication interface isolated drive circuit according to claim 1 and 2 is characterized in that: described photoelectrical coupler is a high-speed photoelectric coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201554062U CN201114169Y (en) | 2007-06-29 | 2007-06-29 | Serial communication interface isolation driver circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201554062U CN201114169Y (en) | 2007-06-29 | 2007-06-29 | Serial communication interface isolation driver circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201114169Y true CN201114169Y (en) | 2008-09-10 |
Family
ID=39965918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201554062U Expired - Lifetime CN201114169Y (en) | 2007-06-29 | 2007-06-29 | Serial communication interface isolation driver circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201114169Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101997603A (en) * | 2009-08-14 | 2011-03-30 | 国际商业机器公司 | Power-up of device via optical serial interface |
| CN109167594A (en) * | 2017-10-30 | 2019-01-08 | 武汉奇致激光技术股份有限公司 | A kind of photoelectric coupling structures and methods of micro controller and one-wire bus device |
-
2007
- 2007-06-29 CN CNU2007201554062U patent/CN201114169Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101997603A (en) * | 2009-08-14 | 2011-03-30 | 国际商业机器公司 | Power-up of device via optical serial interface |
| US8542991B2 (en) | 2009-08-14 | 2013-09-24 | International Business Machines Corporation | Power-up of device via optical serial interface |
| CN101997603B (en) * | 2009-08-14 | 2014-08-13 | 国际商业机器公司 | Method of utilization via optical serial interface |
| CN109167594A (en) * | 2017-10-30 | 2019-01-08 | 武汉奇致激光技术股份有限公司 | A kind of photoelectric coupling structures and methods of micro controller and one-wire bus device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CHONGQING CHUANYI AUTOMATION CO., LTD. Free format text: FORMER OWNER: CHONGQING SICHUAN INSTRUMENT COMPLEX CO.,LTD. Effective date: 20090403 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090403 Address after: No. 1, people's village, Beibei District, Chongqing, China: 400700 Patentee after: Chongqing Sichuan Instrument Complex Co., Ltd. Address before: No. 61, Mount Huangshan Avenue, North New District, Chongqing: 401121 Co-patentee before: Technical Center of China Silan Instrument Group Co., Ltd. Patentee before: Chongqing Sichuan General Factory Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080910 |