# Adding a Modbus RTU client

A UR20-1COM-232-485-422 module can be used as Modbus RTU client over serial line.

1. Open the device view.
2. Add a UR20-1COM-232-485-422 module to your configuration.

1. The Modbus RTU client is inserted subordinate to the UR20-1COM-232-485-422 module.
2. The UR20-1COM-232-485-422 module is automatically parameterised for the use as Modbus RTU client over serial line (RS485).

What to do next

You can change the parameterisation of the UR20-1COM-232-485-422 module to suit the requirements of your Modbus RTU network.

Adding a u-remote I/O module

Parameterising a u-remote I/O module

Copying devices