Rs485 To Rs232 Wiring Diagram. Protocol comparison chart rs 232 rs 422 rs 485 cable single ended. 9 rules for correct cabling of the modbus rs485 industrial communication systems communication system system electrical panel.
To transmit a logic 1 line b is high and line a is low. Figure 3 is an rs485 wiring diagram for rs485 pinout db9 connectors. Check the data sheet schematic or block diagram.
The ground can be connected to the cable shield.
If the port is configured for rs485 the two connections used are the or a on the same pin as the rs232s rx the or b on the middle pin or rs232s tx pin. Rj12 to rs232 serial port how to make notes circuit diagram. The txd and txd lines carry transmit data while the rxd and rxd contain the receive data. Jan 2013 1 05 24 2013 0716 am.