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To differentiate data from the special control characters, any data that
is the same as one of the following special control characters must be
quoted.
A data byte is quoted by replacing it with a two-character sequence.
The first character is a ^A (ASCII hex 0x01), and the second charac-
ter is the character itself XORed with the ASCII value 0x40. For exam-
ple, to send the value 0x14(^T) as data, send the two-character
sequence 0x01 0x54 (^a T) instead. (ASCII “T” is the result of XORing
^T with 0x40).
This method of quoting guarantees that whenever the printer receives
any of the eight control characters, the control function is intended
regardless of whether the preceding character is a ^A. Any data byte
not equal to one of the eight special control characters is transmitted
by sending the data byte.
For more information on BCP and quoting, see the PostScript Lan-
guage Reference Manual (Adobe Systems, Inc., Reading, MA: Addi-
son-Wesley, 1990, ISBN 0-201-18127-4), the “Adobe Serial and
Parallel Communications Protocols Specification” (in
Adobe Devel-
oper Support. Adobe Systems, Inc., February 14, 1992), and the
“PostScript Language Reference Manual” (in
Supplement for Version
2011, Adobe Systems, Inc., January 24, 1992).
ASCII
Keyboard ASCII
Name ASCII
Hex Control Function
^A
^C
^D
^E
^Q
^S
T
^\ SOH
ETX
EOT
ENQ
DC1
DC3
DC4
FS 0x01
0x03
0x04
0x05
0x11
0x13
0x14
0x1C Quote data character
Abort job and flush to end of
file
End-of-file marker
(Reserved for future use)
XON in XON/XOFF flow
control
XOFF in XON/XOFF flow
control
Job status request
(Reserved for future use)