UTEK UT-5204 4port RS485 Guide Rail Type Intelligent Hub(4-port RS-485 Hub, Rail-mounted,binding post, PhotoElectric isolation) Standards: RS-232CRS-485 EIA/TIA  Interface: RS-232C: 10 bits terminal block RS-485: 10 bits terminal block  Transmission media: twisted-pair or shielded cable Working mode: asynchronous half-duplex  Operating power: 9-30VDC/350mA  LEDs for indicating PWR TXD, RXD, and E1-E4 activity Isolated voltage 2,500VRMS 500 DC, DC/DC module  Baudrate: 300bps-115.2kbps  Protection level: RS-232 15KV ESD protection RS-485 provides with 600W lightning, surge protection each line  Transmission distance: 0-5,000m (115,200-300bps)  Dimension: 120mm80mm25mm Operating temperature: -40 to 85  Relative humidity: 5% to 95%  Work with all communication software, plug & play