It is used as the Input Display for the Keypad.
13.11.6.1 Input Display - Basic
For details on how to perform these settings, refer to the following. 14.5 Customizing the System Keypad of the Data Display
13.11.6.1 Input Display - Basic13.11.6.1 Input Display - Basic
14.5 Customizing the System Keypad of the Data Display