4-8 Maintenance & Troubleshooting Rev. E
4.2.6 Printer prints “?“ or Incorrect Data With Serial Interface
If one of the following errors occurs during serial interface communication, the printer prints “?”
or ignores the data, depending on the setting of DIP switch 1-1.
❏ Parity error
❏ Framing error
❏ Overrun error
Note:
For other errors, we recommend confirming the transmission setting of DIP switch 1-3: Handshaking.
4.2.7 Hexadecimal Dump
This feature allows experienced users to see exactly what data is coming to the printer. This can
be useful in finding software problems. When you turn on the hex dump function, the printer
prints all commands and other data in hexadecimal format, along with a guide section to help
you find specific commands.
To use the hex dump feature, follow these steps:
1. After you make sure the printer is off, open the paper roll cover.
2. Hold down the FEED button while you turn on the printer.
3. Close the cover.
4. Run any software program that sends data to the printer. The printer prints “Hexadecimal
Dump” and then all the codes it receives in a two-column format. The first column contains
the hexadecimal codes and the second column gives the ASCII characters that correspond to
the codes. Part of a hexadecimal dump is shown below:
Hexadecimal Dump
To terminate hexadecimal dump,
press FEED button three times.
1B 21 00 1B 26 02 40 40 . ! . . & . @ @
1B 25 01 1B 63 34 00 1B . % . . c 4 . .
41 42 43 44 45 46 47 48 A B C D E F G H
• A period (.) is printed for each code that has no ASCII equivalent.
• In hex dump mode all commands except real time ESC/POS commands are disabled.
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