RS485 communication interface online self-diagnosis system based on specific code element recognition technology
A technology of RS485 and self-diagnosis system, which is applied in the field of self-inspection and online self-diagnosis system of power distribution terminal equipment communication interruption, which can solve the problems of low cost, unfavorable communication circuit and processor circuit for power distribution terminal transformation and upgrading, and achieve cost reduction. The effect of low cost, low upgrade and transformation, and simple scheme
Active Publication Date: 2022-02-01
NANJING SIFANG EPOWER ELECTRIC POWER AUTOMATION
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Problems solved by technology
[0004] The purpose of the present invention is to aim at the deficiency of above-mentioned background technology, provide the RS485 communication interface online self-diagnosis system based on specific code element identification technology, realize the invention purpose that can judge RS485 communication interruption reason online automatically without occupying processor I / O resource, The solution is simple and low in cost, and solves the technical problem that the traditional RS485 communication interface online self-diagnosis method needs to modify both the communication circuit and the processor circuit, which is not conducive to the transformation and upgrading of power distribution terminals
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[0016] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.
[0017] The RS485 communication interface online self-diagnosis system based on specific symbol recognition technology disclosed by the present invention is as follows: figure 1 As shown, it includes: a specific symbol identification and self-loop starting circuit composed of the first fast charging diode D1, the discharging diode D2, the first discharging resistor R1, the first discharging capacitor C1, and the first voltage comparator U4; the second fast charging Self-loop delay exit circuit composed of diode D3, second discharge resistor R2, second discharge capacitor C3, and second voltage comparator U5; self-loop control circuit composed of normally closed relay U2 or non-connecting gate U3; communicate with RS485 The local processor that sends data and transmit enable signals through the interface and receives the self-test data fed back by the...
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The invention discloses an RS485 communication interface online self-diagnosis system based on a specific code element recognition technology, and belongs to the technical field of basic electronic circuits. A local end processor sends out data of a specific code element, an online self-diagnosis system receives confirmation and automatically enters an RS485 receiving and sending self-loop state, and the processor diagnoses whether local end RS485 communication equipment is normal or not by judging whether self-check data sent by a local end is received or not. The system is simple to implement and low in cost, the online self-diagnosis function of the RS485 communication equipment at the home terminal can be realized without additionally increasing I / O resources of the processor, and the transformation of power distribution terminal equipment is facilitated.
Description
technical field [0001] The invention relates to power distribution automation, specifically discloses an on-line self-diagnosis system of an RS485 communication interface based on a specific symbol identification technology, which is used for self-checking of power distribution terminal equipment communication interruption, and belongs to the technical field of basic electronic circuits. Background technique [0002] Traditional power distribution terminal equipment needs to connect to different types, different manufacturers, and different quality equipment through multiple RS485 communication interfaces. At the same time, the site environment is relatively complex, and communication interruption may easily occur. However, power distribution terminal equipment is often unattended. How to automatically determine the cause of communication interruption, especially to determine whether the power distribution terminal equipment is working normally and reduce maintenance workload...
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IPC IPC(8): H04L43/0805H04L41/06
CPCH04L43/0805H04L41/06
Inventor 徐骏刘宏博汤斐挺赵凤青王煜
Owner NANJING SIFANG EPOWER ELECTRIC POWER AUTOMATION