POSIFLEX Business Machines PP7700 Series - Manual (Page 33)

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7.
Advanced Analysis Tool
This printer supports Hexadecimal Dump for experienced
user to view exactly what data is received by the printer. This can
be useful in finding software problems.
To start the dump mode: Turn off printer; Open print hood;
Hold down FEED button while turning printer on; Close the hood.
To stop the dump mode: Press the FEED button to print out
the last line; Turn off the printer.
During dump mode: The host still can access/connect /send
data to PP7700 through the wireless connection, At PP7700 all
commands except DLE EOT and DLE ENQ are disabled.