Parking lot < ahref=“ http://www.fuyingkeji.com/ "> reason and treatment of communication failure of license plate recognition system < / a >

　　1. Cause: open circuit, short circuit or wrong connection of 485 communication line; (more common)

Treatment method: check the communication line, check the wiring, and confirm that there is no open circuit, short circuit or wrong connection of the communication line

　　2. Cause: the control board machine number is set incorrectly; (more common)

Treatment method: check whether the machine number is set correctly, check other control boards in the parking lot management system, check whether there are duplicate machine numbers, and reset the machine number according to the setting method in the manual

　　3. Cause: communication port setting error of management software; (more common)

Solution: check whether the communication server port in the management system software is the same as the connected port number. If the port number connected to the controller is USB or PCI expansion, please check the port number in the computer operating system < device manager >. Please note that the reliability of USB expansion 232 port number is weak, and it will often lead to the change of server port. When the standard allows, PCI serial port expansion card shall be adopted as far as possible