The product is able to convert RS-232 signals to balanced differential RS-485 signals, and RS-232 communication distance extension of 1,2 km, and no external power supply. The converter uses a unique "RS-232 pump" driven, does not require initialization RS-232 serial port can work. Its unique zero delay automatic transceiver conversion technology and baud rate adaptive technology that can automatically control the data flow, and the converter can build point to point, multipoint remote multi-machine communication network, to achieve multi-machine communication response. Main Specifications: * Transfer rate: 300 bps-57.6 kbps * Transmission distance: 1.2 km (9600 bps) * Working mode: asynchronous half-duplex differential transmission * Power supply: serial port to take power * Transmission media: twisted pair or shielded cable * Isolation voltage: 1000V Continuous * Electrical interface: DB9 hole interface to PC, DB9-pin to 485 devices * Operating temperature: 0 ° C-75 ° C * Operating humidity :5-90% * Dimensions: 61mm × 33mm × 17mm