Oki PH640 User Manual page 36

6-3-2. Hexadecimal Dump Mode
(1) Place the thermal paper roll on the printer.
Open the rear cover, then turn the power on while holding the FEED button.
(2) Close the rear cover. "*** HEX DUMP PRINTING ***" is printed, and the
printer enters the Hex Dump Mode.
(3) 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.
(4) The final line is not printed if its data is less than one full line. However, if the FEED but-
ton is pushed, the final line is printed. To turn off the mode, it is necessary to turn off the
printer completely.
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