... 2500V isolation, no power supply needed 4, Automatic send data control, auto distinguish and sense direction adopt data transfer5, Auto sense ... Support EIA RS-232, RS-485 standard RS-232 signal TX , RX, GND RS-485 signal D+, D-, GND Asynchronism, point to ... or multi point,2 wire half-duplex Automatic send data control, auto distinguish and sense direction adopt data transferBand rate 300 ...