... zero delay automatic transmit Support EIA RS-232, RS-485 standard RS-232 signal TX , RX, GND RS-485 signal D+, D-, GND ... surge protection, 15KV static protection Optoelectronic isolate: 2500V RS-232 side: DB-9 female, RS-485 side 3 thermal block Working temperature: - ... supply needed, powered from TXD, RTS, DTR signal in RS-232 port Consumption: Static consumption less than 20mA, dynamic consumption ...