# Changing the name of a data item of a Modbus RTU server

Setting an expressive name simplifies the use of a data item i. e. when mapping it to a global variable.

1. Prerequisite
2. You must add a data item to the Modbus RTU server.

1. Open the device view.
2. In the device tree, double-click the server whose data item you want to edit.
3. Select the data item you want to change.
4. Double-click the Name text box.
5. Name the data item uniquely within the scope of the server.
6. Press Enter.