This product can is a RS-232 and RS-422 bi-directional interface converter. Simple 4-lines communications can be RS422 multi-point framework for communications networks. Has been widely used in point-to-point, point-to-multipoint interface of RS422 communication equipment such as: 1. Industrial Automation System. 2. PLC and PLD. 3. Intelligent surveillance system. 4. POS credit card machines, POS systems. 5. Data acquisition, control system and so on. Features: Serial interface : Interface compatible with EIA / TIA of RS232C, RS422 standard Transmission medium : Ordinary twisted-pair Transmission distance : RS-232 0-5Km (115200 - 9600bps), RS-422 1.2Km (up to 57.6Kpbs) Power Requirements : No need Joint approach : RS-232 -> DB9F, RS-422 -> DB9M Signal : RS-232 -> TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND Work : RS-422 -> TR+, TR-, RxD+, RxD-, GND, VCC Operating temperature : -20â„ƒï½ž50â„ƒ Relative humidity : 5%ï½ž95% Product Dimension: 63mmÃ—33mmÃ—17mm