Why does ATV312 drive only shows Ref and Sup menus?
All serial numbers for ATV312 Drives
The drive may be locked.
Go to SUP menu and then parameter COd
If COd is set to ON the drive has been locked.
To temporarily unlock the drive you have to change the COd parameter to the password and press ENT.
This will unlock the drive until the power is cycled to the drive.
To permanatly unlock the drive you must set the COd parameter to OFF after entering the password.