FSL Reference Manual for Print Servers
Introduction
2.1 FSL Concept
Function Selection via the Line (FSL) sequences are special commands used for
downloading of settings.
The syntax of an FSL command is shown below.
"%" is the defined escape character (i.e. ESC character). See Figure 1 for
definition of an escape character.
%Y<Function number>, <parameter>%
Figure 1, Defining the escape character
When you send the FSL syntax via the line, the "Y" and the following number will
select an FSL Function.
All spaces and IBM control codes between the leading and the trailing ESC
characters will be ignored.
The FSL Functions are used for setting up the printer to special applications, to
carry out a special print job, or to gain access to special facilities in the printer.
NOTE:
Functions not saved using “<ESC>X1” will apply for the actual job only.
2.2 The Escape Character
If you wish to program the FSL top, you must first define an ESC character.
An ESC character is a signal to the interface that the characters following the
ESC character form a command sequence.
Once a character has been defined as the ESC character, it cannot be printed or
used as a normal character. However, it is not necessary to have an ESC
character defined permanently. When the ESC character has served its purpose,
it can be deleted.
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