Port powered RS-232 to RS-485/422 converter, photoelectric isolation. Features:RS232 side in DB9 femaleRS485 side in RJ-45 and 4pin postMax connection: 32 RS485 devices;Max: 1.2 KM (9,600BPS)Baud rate: 300BPS-115.2KBPSProtection: +/-15KV ESD protection for RS-232 interfacePhotoelectric isolation voltage: 2.5KVrms /500VDC600W lightning strike and grounding interference protection for RS-485/422Dimensions: 93mm×74mm×22mmEnvironment: -40℃to 85℃..