SMAKN&reg; USB to RS485 Converter with Surge protection USB directly take electricity without external power supply, stable performance. And all kinds of 485 interface docking, transmission distance up to 1200 meters. With anti-lightning, and anti-static shock, slew-rate-driven, effectively curb electromagnetic interference. Solve the valid signal and the invalid signal is superimposed on the transmission circuit. Error-free data transmission rates up to 115200bit. Therefore, this product line using ordinary data communications data lines can be used.