UTEK UT-2217 External-powered RS-232 to RS-485 Wall-mounted PhotoElectric Isolation S232 side in DB9 female RS485 side in RJ-45 and 4pin post Max connection: 32 RS485 devices; Max: 1.2 KM (9,600BPS). Baud rate: 300BPS-115.2KBPS. Dimensions: 94mmX73mmX22mm . Indicator: Power, Data traffic Environment:-25 to 70, relative humidity 5%-95%. Protection: +/-15KV ESD protection for RS-232 interface Photoelectric isolation voltage: 2.5KVrms /500VDC 600W lightning strike and grounding interference protection for RS-485