RS-232C and RS-485 standards of EIA/TIA. RS232 side in DB9 female, RS485 side in built-in binding post A maximum connection of 32 pieces of network devices. Communication distance: 1.2 KM for RS485 side, 5m for RS232 side Baud rate: 300BPS-115.2KBPS Transmission media: STP/UTP; Working mode: asynchronous half-duplex (RS-485). Working environment: -25℃ to 70℃, relative humidity 5% to 95%. Supporting DOS/WIN95/WIN98/WIN2000/NT/XP and Linux, etc.