Star SP742 Series Hardware Manual page 33

5-4-3. Hexadecimal Dump Mode
Each of the signals sent from the computer to the printer will be printed out in hexadecimal code.
This function allows you to check if a control code sent to the printer by the program being used is correct or not. The
last line is not printed if its data is less than one full line. However, if the FEED switch is pressed, the last line will be
printed. To turn off the mode, it is necessary to turn off the printer completely.
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