Intermec EasyCoder 7421 User Manual page 37

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For direct thermal media, use the three-digit media sensitivity
number located on the roll of media to set the media sensitivity
number. You can also use the values from the tables in the next
section.
For thermal transfer media, you need to look in two places to
determine the sensitivity number. The media sensitivity number
on each roll of thermal transfer media or ribbon has an asterisk
(*) in place of one of the digits. On thermal transfer media, the
number contains the first and second digits, with an asterisk in
place of the third digit. One the thermal transfer ribbon, the
number contains the first and third digits, with an asterisk in
place of the second digit.
To optimize the sensitivity number for thermal transfer media,
you combine the digits like this:
Thermal transfer 56*
media
Thermal transfer 5*7
ribbon
567
C o d e 39 C o d e 39
The asterisk reserves the
third digit to identify the
ribbon's sensitivity
number.
The asterisk reserves the
second digit to identify
the media's sensitivity
number.
Optimal media
sensitivity number