HXSP-2108B is our top-of-the-line converters with both lightningproof and surge protection .The RS-422/485 side and the RS232 side is powered by an external power . Specification & Features: Interface Feature:Concurrently confirm to RS-232C/RS-485/RS422 standard of EIA/TI. Electricity Interface:RS-232 Interface DB9 Hole connector,RS485/RS-422 interface connects RJ45 with DB9 Female connector. The interface equipment has 6-bits connecting ends.?? Signal indication: 3 signal indication light: TXD??RXD??POWER . Data Communication Speed :300-115.2KBPS .?? ???? Protection grade:1500W surging-protection . Connected equipment avaible:32-128 equipments . Size : 93??2??3(mm) .