Can a UserDRO be set up to accept numbers and letters (or just letters)?

I notice there is a "string format" in Screen Designer for the DROs.
Is there a way to set that to letters?

Thanks
Scrappy

Not that I know of - the DRO is supposed to emulate a Digital readout -  i.e. numbers. There should be no reason why it could not display letters, but I can only assume that they were only equipped with numbers and a full stop, the other characters will be ******