Rapid communication structure and rapid communication method for multiple upper computers and controller based on RS485 bus

• Main Authors: LIANG XIDONG, DONG WENCHAO, DUAN CHANGMAO
• Format: Patent
• Language: Chinese; English
• Published: 25.03.2022
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The invention relates to the field of industrial communication, and discloses a rapid communication structure and a rapid communication method for multiple upper computers and controllers based on an RS485 bus, the controllers are powered on for the first time, data are sent to the upper computers in a broadcast mode, the data are transmitted in one step, and the time for polling the controllers one by one by the upper computers is saved; in the subsequent operation process, the controller only broadcasts changed data, and a large number of bus resources occupied by unchanged data communication are saved; meanwhile, the controller can respond to a request command and a value writing command of the upper computer to all data, and value writing of the upper computer adopts a message queue to ensure that the value writing command is not lost; most importantly, the controller and the upper computer respectively carry out CRC verification on all data of the computer, if the data are not consistent, the controller