RS485 Pinout - RS485 connector pinout and contacts Figure 4. RS485 pin configuration for DB 25. Figure 3 is an RS485 wiring diagram for RS485 pinout DB9 connectors. Figure 4 is a pin diagram for both 25 pin RS485 pinout half duplex and full duplex pinout connectors. The TxD+ and TxD- lines carry transmit data while the RxD+ and RxD- contain the receive data.5/5(86)Category: Serial Port Software RS232 to RS485 cable pinout diagram @ pinouts EIA-485 cable usually made with twisted pair (like EIA-422) and may span up to 1200 metres. The recommended arrangement of the wires is as a connected series of point-to-point nodes, a line or bus. Ideally, the two ends of the cable will have a termination resistor connected across the two wires and two powered resistors to bias the lines apart when the lines are not being driven.4.6/5(13) RS232 Cables: Wiring & Pin Connections » Electronics Notes Whenever RS232 is used, RS232 cables will be needed to provide the required electrical connection. These cable can take a variety of forms in terms of the physical methods used for construction as well as the number of connections that are incorporated within the overall RS232 cable.