"There is also a password you can set on the display itself to prevent tampering by your 3-year old. By default, this is "xyz" and can be updated via the Setup → Display Setup → Display Password screen. To lock the display, select Control/Status – Display Lock. You will be prompted for the password the next time you want to use the display. If you set the display lock and later forget what the password is you can reset it to the default by cycling the power on the base unit. It will reset to the default ‘xyz’ any time you cycle the power."