Monitoring circuit of RS485 bus

• Main Authors: WANG PENG, PAN QINGSHENG, FU ZIMING, WANG YISHEN, QIU NANYANG, LIU XINXIN, HE JIANWEN
• Format: Patent
• Language: English
• Published: 01.04.2015
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PHYSICS; SIGNALLING; TRANSMISSION; TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILARSIGNALS

The utility model provides a monitoring circuit of an RS485 bus. The monitoring circuit includes a control module, a control monitoring circuit and a data monitoring circuit, the control monitoring circuit includes a first communication switching circuit and a first communication transceiving circuit, the data monitoring circuit includes a second communication switching circuit and a second communication transceiving circuit, the control module outputs a first control signal to the first communication switching circuit and outputs a second control signal to the second communication switching circuit, the first communication transceiving circuit is used for receiving a control monitoring signal and outputting a switching control monitoring signal to the first communication switching circuit, and the second communication transceiving circuit is used for receiving a data monitoring signal and outputting a switching data monitoring signal to the second communication switching circuit. Through Baud rate adjustment of monitoring data and control, data of the RS485 bus after hopping are obtained, thereby realizing dynamic monitoring of data transmitted by the RS485 bus, and then a transmission fault can be discovered in time.