Automatic testing device and method for programmable RS485 serial port

The invention relates to the field of automatic testing, in particular to a programmable RS485 serial port automatic testing device and method.The device is composed of a hardware system and a software system, one end of the hardware system is connected with a tested unit through an RS485 serial port, the other end of the hardware system is connected with the software system through a USB, the software system is installed on a PC, and the PC is connected with the RS485 serial port. After the imported test script language is analyzed, a code instruction is issued to the hardware system, the hardware system executes the code instruction, and the software system reads the execution state of the hardware system regularly and displays or generates a report file through an interface. According to the invention, a software and hardware cooperation mode is used, a software system is installed in the PC, the PC is connected with the hardware system through a USB, and all core elements in the designed hardware system a