Evolis Pebble 4 Card printer.
Tried to perform encoding using ISO1 format for alphabet characters but failed ?
The reason is because ISO1 only supports alphabet letter from A to Z upper case only, not lower case.
If you are trying to encode abc123, it will fail - you should ABC123 instead.
To encode lower case alphabet, you have to use the SIPASS format which supports ASCII characters from 16 to 127 - refer to ACSII table.