External powered RS-232 to RS-485 converter, photoelectric isolation.Features:RS232 side in DB9 femaleRS485/422 side in RJ-45 and binding postMax connection: 32 RS485/422 devices;Max: 1.2 KM (9,600BPS)Baud rate: 300BPS-115.2KBPSProtection: Photoelectric isolation voltage: 2.5KVrms /500VDC600W lightning strike and grounding interference protection for RS-485/422Environment: -25℃ to 70℃, relative humidity: 5%-95%Dimensions: 97mm×65mm×22mm..