UTEK UT-503 External-powered, RS-232 to RS-485/422, Rail-mounted, PhotoElectric Isolation Standards: RS-232C/ RS-485, /RS-422 EIA/TIA  RS-232 DB9 female connector input; RS-422/485 10 bits terminal block output Port protection: RS-232 15KV ESD protection; RS-422/485 each line 600W surge, lightning protection Isolation: isolated voltage 2,500VRMS 500VDC  Working mode: asynchronous half-duplex or full-duplex LEDs for indicating PWR TXD, and RXD activity  Transmission media: twisted-pair or shielded cable Baudrate: 115.2Kbps to 300m 38.4Kbps to 2.4Km 9,600bps to 5Km