... Control , can working ifonly have TxD signal provide power. RS485/422 interface adopt beforhand aggravatedesign, extend RS232 signal to 6000 feet ... automatic transmit Standard Accord EIA RS-232, RS-485, RS-422 standard RS-232 signal TX, RX, GND RS-485 signal ... D+, D-, GND RS-422 signal R+, R-, T+, T-, GND Asynchronism,point to ... Weight 50g Industrial RS-232/485 or RS-232/422