Product Name: RS232/RS485 to 4 ports RS485 repeater / hub Product model: RS485H4P Compatible with RS232, RS485 TIA / EIA standard Automatic sending and receiving data: RS485 three wire system (TXD, RXD, GND) communication Input interface: 1 channel RS232/ RS485 Output interface: 4 channel RS485 Communication rate: 300bps-115.2kbps (adaptive) Working power supply: DC9-40v 500mA Load capacity: each RS485 port can connect 128 devices Communication distance: 3000m (each interface) Work indicator: power indicator, data direction indicator, channel indicator Working mode: asynchronous half duplex (RS485 two-way communication) Photoelectric isolation: isolation voltage 2.5kvrms/500v DC insulation, isolation of DC / DC module.600W surge protection, 15kV ESD protection Electrical interface: RS232, RS485 (6, 10 core industrial terminal), power supply (2.5 jack) Transmission Cable: twisted pair or shielded cable Installation mode: 35mm DIN rail installation, or 4-hole wall hanging, or other suitable installation mode. Product size: 122 * 72 * 33 mm / 4.8 * 2.83 * 1.3 in Working environment: temperature - 40 ? - 85 ?, relative humidity > 95% RH What's in the box: RS485H4P*1pcs, 12V/1A DC power adapter*1pcs