... and play, small volume, easy installation 2, Port-powered, high efficiency obtain electricity, can also worked on 3 lines 3 ... rate, zero delay automatic transmit Support EIA RS-232, RS-485 standard RS-232 signal TX , RX, GND RS-485 signal D+, D-, GND Asynchronism ... protection, 15KV static protection Optoelectronic isolate: 2500V RS-232 side: DB-9 female, RS-485 side 3 thermal block Working temperature: ...