This RS232 female to RS485 male converter is perfect to add an RS485 interface to a PC via RS232 connector. Via this converter you can plug the devices with RS485 male connector to your PC directly. This converter is suitable for video surveillance system control Pan and Tilt Cameras for PTZ decoder box IC card system. - Compatible with RS-485 and RS-232C of EIA/TIA - Transmission rate: 300~115200 BPS - Transmission distance: 5m (RS-232) 1200m(RS-485) - Communication protocol: transparent - Working temperature: -10?~85? - Signal: RS-232: TXD RXD RTS CTS DTR DSR DCD GND RS-485: Date+ Date- GND