I-Data 5250 ALLY - Manual (Page 230)

AGILE 5250 ALLY User’s Guide and Reference Page C-2
The transparent packet itself consists of two trigger characters, the data to
be sent to the printer without translation, and one trigger character that is
used to terminate the transparent packet. For example, to send an ASCII
escape (1Bh) to the printer, the application would send the following
packet:
%%1B%
Transparent data may also be sent as text when the text is placed between
apostrophes ('), as shown below:
%%1B'0Titan10iso-P'0D0A%
The 5250 ALLY will convert all printable text characters between
apostrophes into the appropriate hexadecimal values using the active
character code translation table.
All hexadecimal values may be separated with spaces, commas or carriage
control commands. The 5250 ALLY will remove these characters before
sending the transparent command to the printer.
MPI Pseudo Transparency
This form of pseudo transparency is valid only for twinax data streams
when the 5250 ALLY is in Xerox 275 twinax protocol converter emulation
mode (!AGILE!03=02;).
The trigger and terminator for MPI pseudo transparency is not determined
by the user. Both the trigger and the terminator consist of an ampersand
(&) followed by a percent sign (%). When the 5250 ALLY encounters
these two characters together, it begins pseudo transparency operations
until the next consecutive occurence of the characters. For instance, to
send a PCL printer reset command (Esc E) to the printer, the command
sent to the 5250 ALLY would look like this:
&%1B45&%
1Bh is the ASCII escape character, and 45h is the uppercase E.
All values in this form of transparency must be in hexadecimal format, and
they must not be separated by any printable characters or carriage control
commands.