RS232/RS485/422 optical isolation converter. Full duplex & half duplex; Optoelectronic isolation; External 5VDC power supply; Automatic transceiver and conversion without delay; Maximum rate: 230Kbps; Maximum communication distance: 2km (9600bps) or 3km (4800bps); Rail-mounted industrial structure; With communication indicator; Can be configured with 128 RS485 nodes; Lightning protection.