Circuit and method for automatically detecting RS485 communication failure
A technology for RS485 and communication faults, which is applied in the direction of electrical components, digital transmission systems, transmission systems, etc., can solve the problems of communication faults that are difficult to locate, and achieve the effect of ensuring normal operation
Active Publication Date: 2018-12-25
JIANGSU AEROSPACE DAWEI TECH CO LTD
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[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a circuit for automatically detecting RS485 communication failures, and a method for automatically detecting RS485 communication failures, so as to solve the difficulty of locating communication failures in the access control system in a short time The problem
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[0029] The present invention will be further described below in conjunction with specific drawings and embodiments.
[0030] The circuit for automatically detecting RS485 communication failures provided by the present invention includes a master device and a slave device;
[0031] The circuit of the main equipment such as figure 1 As shown, it includes a first microprocessor, a first RS485 transceiver circuit, and a second RS485 transceiver circuit; the first RS485 transceiver circuit is connected to the first microprocessor and is provided with external RS485 communication ports A1 and B1; The RS485 transceiver circuit is connected to the first microprocessor, and has external RS485 communication ports A2 and B2; the two external RS485 communication ports A1, B1 and A2, B2 of the main device have independent data transmission and reception functions;
[0032] The circuit of the slave device such as figure 2 As shown, it includes a second microprocessor, a third RS485 transceiver ci...
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The invention provides a circuit for automatically detecting RS485 communication failure, which comprises a master device and a slave device. The circuit of the master device comprises a first microprocessor, a first RS485 transceiver circuit and a second RS485 transceiver circuit. The first RS485 transceiver circuit is connected with the first microprocessor and is provided with external RS485 communication ports A1 and B1. The second RS485 transceiver circuit is connected with the first microprocessor and provided with external RS485 communication ports A2 and B2. The two groups of RS485 communication ports A1, B1 and A2, B2 outside the main equipment have independent data transmitting and receiving functions. The circuit of the slave device comprises a second microprocessor, a third RS485 transceiver circuit, an RS485 receiving circuit and a switching circuit. The external RS485 communication ports A3 and B3 of the third RS485 transceiver circuit are connected with the switching circuit; the external RS485 communication ports A4 and B4 of the RS485 receiving circuit are connected with the switching circuit; a switch circuit controlled by a second microprocessor. The invention can detect the fault in the RS485 line of the access control system in a short time.
Description
Technical field [0001] The invention relates to the technical field of RS485 bus communication, in particular to a method for detecting RS485 communication failures. Background technique [0002] The RS485 bus is used for networking between the network controller and the local controller in the access control system. In actual use, the RS485 bus line hardware failure (disconnection, poor contact, etc.), the controller itself software failure (receiving buffer overflow , Protocol data errors, etc.) may cause communication problems in the entire RS485 network. In the use of the access control system, problems need to be located and resolved in time to ensure the stable operation of the entire system. In general, the occurrence of communication problems requires manual on-site investigations one by one, which takes a lot of time, and it is difficult to locate and solve the problem in the first time. Summary of the invention [0003] The purpose of the present invention is to overco...
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Login to View More IPC IPC(8): H04L12/24
CPCH04L41/0677
Inventor 林志何煜埕过陈晨沈小惠
Owner JIANGSU AEROSPACE DAWEI TECH CO LTD