... -powered, high efficiency obtain electricity, can also worked on 3 lines 3, Support 2500V isolation, no power supply needed 4, Automatic send ... adopt data transfer5, Auto sense serial signal rate, zero delay automatic transmit Support EIA RS-232, RS-485 standard RS-232 ... , point to point or multi point,2 wire half-duplex Automatic send data control, auto distinguish and sense direction adopt data ...