This is a RS-232 and RS-485 normal grade interface converter. Simple second-line communications can be RS485 multi-point framework for communications networks. Has been widely used in point-to-point interface. Features: Compatibility: EIA/TIA RS232C standard and RS485 standard Interface RS232 side: DB9 female connector. Interface RS485 side: DB9 male connector with optional (included) terminal board. Transmission rate: 300 - 115200bps Transmission distance: RS485 max. 1200m, RS232 side max. 5m Working mode: asynchronous, half-duplex, differential transmission. Working environment: -20 ~ 70°C, relative humidity 5% - 95% Mechanical dimensions: 95mm x 33mm x 17mm Package Content: 1 x RS-232 / RS-485 Converter