# Adding a Modbus RTU server

You can add up to 32 servers per client.

1. You must add a Modbus RTU client to your device configuration.

1. In the device tree, right-click on the client.
2. In the context menu, select Add device.

1. A new server is added below the client. The lowest unused server ID in the range of 1 to 247 is assigned to that server. All servers are sorted by their server ID. The newly added server remains selected.

Adding a Modbus RTU client

Copying devices

Changing the ID of a Modbus RTU server

Adding a data item to a Modbus RTU server