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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.
ASCII
Keyboard
^A
^C
^D
^E
^Q
^S
^T
^\
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
character is the character itself XORed with the ASCII value 0x40.
For example, 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 Language Reference Manual
(Adobe Systems, Inc., Reading, MA: Addison-Wesley, 1990,
ISBN 0-201-18127-4), the "Adobe Serial and Parallel
Communications Protocols Specification" (in Adobe Developer
Support. Adobe Systems, Inc., February 14, 1992), and the
"PostScript Language Reference Manual" (in Supplement for
Version 2011, Adobe Systems, Inc., January 24, 1992).
A d d i t i o n a l T e c h n i c a l I n f o r m a t i o n
ASCII
ASCII
Name
Hex
SOH
0x01
ETX
0x03
EOT
0x04
ENQ
0x05
DC1
0x11
DC3
0x13
DC4
0x14
FS
0x1C
Control
Function
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)
Appendix D
D - 1 1
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