... into RS485 signal, Port-powered, Support 2500V isolation, no power supply needed. 1, Plug and play, small volume, easy installation ... 3 lines 3, Support 2500V isolation, no power supply needed 4, Automatic send data control, auto distinguish and sense direction adopt data ... or multi point,2 wire half-duplex Automatic send data control, auto distinguish and sense direction adopt data transferBand rate ...