DAM-3210A is a general-purpose RS232/RS485 rail-mounted opto-isolated converter, compatible with EIA/TIA RS-232C and RS-485 standards. It can automatically send/receive data without external flow control signal (RTS), belonging to true three-wire (TXD, RXD, GND) communication. DAM-3210A does not need to initialize the RS-232 serial port, just plug and play. The transmission rate can reach 9600bps~115.2Kbps, which can be applied to form a point-to-point, point-to-multipoint remote multi-machine communication network between the main control machines, between the main control machine and the microcontroller or peripherals, and can connect 32 network devices to realize multi-machine response communication.