CN205318374U - Redundant circuit of RS -232 serial ports - Google Patents
Redundant circuit of RS -232 serial ports Download PDFInfo
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- CN205318374U CN205318374U CN201620000698.1U CN201620000698U CN205318374U CN 205318374 U CN205318374 U CN 205318374U CN 201620000698 U CN201620000698 U CN 201620000698U CN 205318374 U CN205318374 U CN 205318374U
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Abstract
The utility model discloses a redundant circuit of RS -232 serial ports, central processing unit, serial port connection ware including having UART serial ports interface module and GPIO interface still include first combiner, second combiner, distributor, RS -232 serial ports chip, passageway detection circuitry, all available UART serial ports interface module of central processing unit are connected to the combiner respectively, first combiner, distributor, RS -232 serial ports chip are connected in order, and the multiplexed output of RS -232 serial ports chip all is connected to a second combiner sum channel detection circuitry, the serial port connection ware is arrived in a second combiner reconnection, passageway detection circuitry is connected to central processing unit's the GPIO interface and the multiplexed output interface of RS -232 serial ports chip respectively. The utility model discloses the use of maximum possible the data channel of central processing unit and RS -232 serial ports chip, to have made the multichannel spare for the serial port communication passageway, has improved the equipment serial interface rate of utilization and hardware tolerable error rate.
Description
Technical field
This utility model belongs to embedded device hardware circuit design field, is specifically related to the redundant circuit of a kind of RS-232 serial ports.
Background technology
Current serial port circuit is designed as: signal sends from the UART serial interface of central processing unit, carries out after level conversion through RS-232 serial port chip, sends to serial port connector. To realize the purpose that user is communicated by serial ports and central processing unit.
UART serial interface (UniversalAsynchronousReceiver/Transmitter, universal asynchronous receiving-transmitting transmitter) is a kind of asynchronous receiving-transmitting transmitter. This bus two-way communication, it is possible to achieve full duplex transmission and reception, extensive use Embedded Hardware Design field. It is embodied in independent modularity chip, or as the peripheral equipment being integrated in central processing unit. UART is general and RS-232 specification, and standard signal amplitude conversion chip is arranged in pairs or groups, as the interface connecting external equipment, for realizing the communication of main frame and auxiliary equipment. Current UART serial port module is all integrated in central processing unit substantially, and central processing unit belongs to comparatively fragile DC low-voltage electronic chip, and its UART serial interface is vulnerable to external electrical, electromagnetic interference and cause damaging.
Between UART interface and the serial port connector of the centrally located processor of RS-232 serial port chip, generally there is multiple communication channel, it is available for multichannel UART serial interface to use, its signal amplitude is converted, makes the TTL/COMS level signal that UART serial interface exports be converted to the receptible RS232 level signal of client PC end serial interface.
Serial port connector is user oriented signaling interface, is generally present in equipment mainboard with Peripheral Interface forms such as DB9 or RJ-45, is equipment central processing unit end and the user junction point that controls end.
With current serial port circuit design, once present communications serial interface is because a variety of causes damages, then cannot continue system is debugged, it is necessary to the central processing unit more renewed or RS-232 serial port chip could continue system is debugged.Such way not only wastes time and energy, and also can increase the cost payout of enterprise.
Summary of the invention
For achieving the above object, this utility model provides the redundant circuit of a kind of RS-232 serial ports, including having the central processing unit of UART Ports Serial Communication Ports and GPIO interface, serial port connector, also include the first combiner, the second combiner, allotter, RS-232 serial port chip, Air conduct measurement circuit; The all available UART Ports Serial Communication Ports of central processing unit is connected respectively to combiner; First combiner, allotter, RS-232 serial port chip are sequentially connected with, and the multiple-channel output of RS-232 serial port chip is all connected to second combiner and Air conduct measurement circuit; Second combiner is connected to serial port connector; Air conduct measurement circuit is connected respectively to the GPIO interface of central processing unit and the multiple-channel output interface of RS-232 serial port chip.
Compared with designing with prior art, the utility model has the advantages that:
1) in this utility model, the all available UART serial interface of central processing unit end synthesizes a road UART rs 232 serial interface signal by combiner, then input multi output allotter again through one and be connected to RS-232 die terminals, and can be assigned on the designated lane of any RS-232 serial port chip, this utility model maximum possible employ central processing unit and the data channel of RS-232 serial port chip, it is made that multichannel backs up for serial communication passage, improves equipment of serial interface utilization rate and hardware fault-tolerant rate.
2) in this utility model, UART serial ports is used to carry out communication at equipment end and user side, during Current communications passage accidental damage, if RS-232 serial port chip current channel damages, then equipment end and user side completely can impregnable continuation communications, if the current UART serial interface of central processing unit end damages, reprocess without equipment or on-the-spot replacing central processing unit, it is possible to directly switching UART passage gets final product the serial communication of restorer end and user side. The design increases stabilization of equipment performance, reduce the repair rate of equipment, saved manpower and materials cost, and solve field apparatus because serial ports damages problem that cannot be carried out debugging etc.
3) in this utility model, no matter product facility is in research and development, produce, debugging, detection, the links such as maintenance, as long as about the fault of UART serial ports or problem, can use the Air conduct measurement circuit in the design that each UART serial interface of central processing unit and each passage of RS-232 serial port chip are detected and keeped in repair.
4) in this utility model, the combiner that adopts, allotter and Air conduct measurement circuit will not change data and the signal integrity of serial communication, and its effect is connected to RS-232 chip with central processing unit end UART signal, and to be connected to the connection of serial port connector identical.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Detailed description of the invention
Design concept of the present utility model is: increase the redundant circuit design of serial interface between central processing unit and serial port connector, can not change on the basis of serial ports original function, utilize untapped serial communication passage in many UART serial interface integrated in current central processing unit and RS-232 serial port chip to design serial ports redundant circuit. When present communications UART serial interface damages because of a variety of causes, by switching to the mode of the UART serial interface of other normal operation, the proper communication of maintenance equipment and user side, ensures to be continuing with equipment and commissioning device when without changing microprocessor or RS-232 serial port chip.Current most of central processing unit is all integrated with multiple UART serial interface, and therefore this utility model is applicable to all equipment having many UART serial interface processor.
This utility model includes: central processing unit (includes its UART interface part and GPIO interface part), the first combiner, the second combiner, allotter, RS-232 serial port chip, Air conduct measurement circuit, serial port connector. Wherein:
The all available UART Ports Serial Communication Ports of central processing unit is connected respectively to the first combiner; First combiner is connected to allotter; Allotter is connected to RS-232 serial port chip; The multiple-channel output of RS-232 serial port chip is connected respectively to second combiner; Second combiner interface channel testing circuit; Air conduct measurement circuit is connected respectively to GPIO interface and the serial port connector of central processing unit.
Below various piece is introduced respectively.
Air conduct measurement circuit is controlled, it is possible to achieve the detection to each UART serial ports passage, thus realizing the purpose of switching UART passage by the GPIO interface of central processing unit. Central processing unit can adopt and is integrated with the configuration of many UART serial interface and has any a central processing unit of at least one vacant GPIO interface, its process being responsible for serial data and control to Air conduct measurement circuit.
First combiner is made up of the logic chip of two panels multichannel input single channel output, its input is connected with the multichannel UART serial interface of central processing unit, and the multichannel UART rs 232 serial interface signal of central processing unit is converted into a road rs 232 serial interface signal by its outfan transmission to allotter.
The logic chip that allotter is inputted multiple-channel output by two panels single channel forms, and its input connects the outfan of first combiner, and its outfan is connected to the input of RS-232 serial port chip. Allotter is responsible for receiving the serial communication data that send over of first combiner, and these serial communication data are converted into multiple-channel output send to RS-232 serial port chip.
RS-232 serial port chip is common multichannel input multiple-channel output serial port chip, and its input connects the outfan of allotter, and its outfan is connected to Air conduct measurement circuit. RS-232 serial port chip is responsible for receiving the serial data of allotter multichannel input, data are converted to by the Transistor-Transistor Logic level signal of equipment end the CMOS level signal of client PC end serial interface, and the data converted are simultaneously sent to second combiner and Air conduct measurement circuit.
Second combiner is made up of the logic chip of two panels multichannel input single channel output, its input is connected with the multichannel COMS level signal interface of RS-232 serial port chip, and the multichannel COMS level signal of RS-232 serial port chip is converted into a road COMS level signal by its outfan transmission to serial port connector.
Air conduct measurement circuit is made up of one group of low-impedance electronic switch chip of low latency, and its input is connected with the outfan of RS-232 serial port chip, and it controls end and is connected to the GPIO interface of central processing unit. Air conduct measurement circuit is responsible for switching communication channel by the instruction of central processing unit, plays each road serial communication Air conduct measurement and the effect of passage switching.
Operation principle of the present utility model is:
Central processing unit can pass through internal register configuration and use its any one integrated UART serial interface, the UART serial interface of all central processing units end synthesizes a road UART rs 232 serial interface signal by combiner, then it is connected to RS-232 serial port chip again through an allotter inputting multi output, and can be assigned on the signal input designated lane of any RS-232 serial port chip;Equally, outfan in RS-232 serial port chip, multipath output signals is to be converted to a road rs 232 serial interface signal by second combiner to be connected to serial port connector, so can be achieved with any UART serial interface of central processing unit and any passage of RS-232 chip is capable to connect to final user port, it is possible to achieve arbitrarily selecting and combination of passage.
Claims (1)
1. the redundant circuit of a RS-232 serial ports, including having the central processing unit of UART Ports Serial Communication Ports and GPIO interface, serial port connector, it is characterised in that: also include the first combiner, the second combiner, allotter, RS-232 serial port chip, Air conduct measurement circuit; The all available UART Ports Serial Communication Ports of central processing unit is connected respectively to combiner; First combiner, allotter, RS-232 serial port chip are sequentially connected with, and the multiple-channel output of RS-232 serial port chip is all connected to second combiner and Air conduct measurement circuit; Second combiner is connected to serial port connector; Air conduct measurement circuit is connected respectively to the GPIO interface of central processing unit and the multiple-channel output interface of RS-232 serial port chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620000698.1U CN205318374U (en) | 2016-01-04 | 2016-01-04 | Redundant circuit of RS -232 serial ports |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620000698.1U CN205318374U (en) | 2016-01-04 | 2016-01-04 | Redundant circuit of RS -232 serial ports |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205318374U true CN205318374U (en) | 2016-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620000698.1U Active CN205318374U (en) | 2016-01-04 | 2016-01-04 | Redundant circuit of RS -232 serial ports |
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| Country | Link |
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| CN (1) | CN205318374U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109582620A (en) * | 2018-12-21 | 2019-04-05 | 郑州云海信息技术有限公司 | A kind of UART interface conversion equipment and interface conversion method |
| CN112752024A (en) * | 2020-12-29 | 2021-05-04 | 微医云(杭州)控股有限公司 | Method and device for controlling multiple external cameras by intelligent terminal |
-
2016
- 2016-01-04 CN CN201620000698.1U patent/CN205318374U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109582620A (en) * | 2018-12-21 | 2019-04-05 | 郑州云海信息技术有限公司 | A kind of UART interface conversion equipment and interface conversion method |
| CN109582620B (en) * | 2018-12-21 | 2021-11-26 | 郑州云海信息技术有限公司 | UART interface conversion device and method |
| CN112752024A (en) * | 2020-12-29 | 2021-05-04 | 微医云(杭州)控股有限公司 | Method and device for controlling multiple external cameras by intelligent terminal |
| CN112752024B (en) * | 2020-12-29 | 2022-02-18 | 微医云(杭州)控股有限公司 | Method and device for controlling multiple external cameras by intelligent terminal |
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