Change the connection key set up on each display unit.
If you forget the connection key, you will not be able to connect to the display unit.
For details about the setting screen, refer to the setting guide.
M.17.4.3 Security Settings - Connection Key
Go to offline mode and touch [Security Settings] on the item changeover switch.
For GP-4100 Series (Monochrome Model), touch the [Security] button.
In the [Security Settings] screen that opens, touch [Connection Key].
The [Connection Key] screen opens. Touch the [Enter current connection key] field to display a keypad and enter the current key.
When the [Enter new connection key] field appears, enter the new key.
Touch [Save].