Epson U200B - TM Color Dot-matrix Printer Operator's Manual page 41

To use the hex dump feature, follow these steps:
1. After you make sure the printer is off, set DIP switch 1-2 to ON.
2. Turn on the printer while you hold down the PAPER FEED
button; then release and press the PAPER FEED button quickly.
Note:
Perform releasing and pressing the PAPER FEED button before
the printer finishes initializing; otherwise the printer begins the
self test.
3. When the printer enters the hex dump mode, it prints
"Hexadecimal Dump."
4. Run any software program that sends data to the printer. The
printer prints 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.
Hexadecimal Dump
1B 21 00 1B 26 02 40 40
1B 25 01 1B 63 34 00 1B
41 42 43 44 45 46 47 48
A period (.) is printed for each code that has no ASCII
equivalent.
Control codes are printed in bold for emphasis.
During the hex dump all commands except DLE EOT and
DLE ENQ are disabled.
5. When the printing finishes, turn off the printer or reset it to
turn off the hex dump mode.
6. If you changed DIP switch 1-2, set it back to OFF.
3-8 Troubleshooting
: . ! . . & . @ @
: . % . . c4 . .
: ABCDEFGH