Datamax DMX E E-4204 Operator's Manual page 50

To print the Hex Dump Label:
With the printer on, loaded with media (at least 4 inches wide) and ribbon
(if printing with thermal transfer media), press and hold the button
while turning the printer on. Continue holding the button until the
PAUSED Light turns off. Now, all data received by the printer will be
output in hexadecimal code, as shown below.
To exit the Hex Dump Mode:
Turn the printer off.
40 E-4203/E-4204/E-4304