... zero delay automatic transmit Support EIA RS-232, RS-485 standard RS-232 signal TX , RX, GND RS-485 signal D+, D-, GND ... control, auto distinguish and sense direction adopt data transferBand rate 300-38400bps, auto sense serial signal rate Support 128 point ... supply needed, powered from TXD, RTS, DTR signal in RS-232 port Consumption: Static consumption less than 20mA, dynamic consumption ...