Disguising Control Code Characters
There may be occasions when ASCII Control Codes (00H - 19H)
must be included as part of the Data Format block of a Request
Packet. To eliminate any problems, these characters must be disguised
so that the communication protocol does not act on them.
A three step procedure must be used to disguise each Control Code.
1. A SUB (1AH) character must precede each Control Code placed
in the Data Format block.
2. The value of 40H must be added to the Hex value of the
Control Code.
3. The ASCII Character corresponding to the total value produced
in step 2 must be entered in the Data Format right after the SUB
character.
The Zebra printer automatically converts the modified control charac-
ter back to its correct value by discarding the SUB (1AH) character
and subtracting 40H from the next character.
Example:
To include a DLE (10H) character in the Data Format block:
1. Enter a SUB (1AH) character into the Data Format.
2. Add 40H to the DLE value of 10H for a resulting value of 50H.
3. Enter the ASCII character “P” (50H) in the Data Format after
the SUB character.
NOTE: This technique is counted as two characters of the 1024
allowed in the Data Format block.
APPENDIX G 365
Error Detection Protocol
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