RS485/RS232 schema
If you're using Modbus RTU, connect the provided terminal blocks to the RS485/RS232 port, using the following pin-out:
| Pin | RS485 | RS232 |
|---|---|---|
| 1 | RS485_NEG | RS232_TXD |
| 2 | RS485_POS | RS232_RTS |
| 3 | GND | GND |
| 4 | NC | RS232_CTS |
| 5 | NC | RS232_RXD |
| 6 | GND | GND |
RS485 / RS232 interface pin numbering