... Support 128 point loopback RS-485 side 1200M (9600bps), RS-232 side less than 5M 600W surge protection, 15KV static protection ... Optoelectronic isolate: 2500V RS-232 side: DB-9 female, RS-485 side 3 thermal block ... supply needed, powered from TXD, RTS, DTR signal in RS-232 port Consumption: Static consumption less than 20mA, dynamic consumption less ...