Port powered RS-232 to RS-485 converter (mini size), photoelectric isolation. Features:RS-232 side in DB9 femaleRS-485 side in DB9 male and binding postMax connection: 32 RS485 devices; Max distance: 1.2 KMBaud rate: 300BPS-115.2KBPSProtection:+/-15KV ESD protection for RS-232 interfacePhotoelectric isolation voltage: 2.5KVrms /500VDC600W lightning strike and grounding interference protection for RS-485Size: 58mm×33mm×19.5mmEnvironment: -25-70℃, ..