Epson U220B - TM Two-color Dot-matrix Printer Technical Reference Manual page 94

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:
• 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.
5. Open the cover to set the printer offline so that it will print the last line.
6. Close the cover and turn off the printer, press the FEED button three times, or reset the
printer to turn off the hex dump mode.
Note:
The hexadecimal dump mode can't be used with OPOS or the APD.
4-8 Troubleshooting
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
41 42 43 44 45 46 47 48
. ! . . & . @ @
. % . . c 4 . .
A B C D E F G H
Rev. D