Special Function Control Code (Sfcc); Command Sequence; Command Parameters; Brackets - Printronix L7032 Programmer's Reference Manual

Special Function Control Code (SFCC)

The SFCC identifies a command directed to VGL to enable a specific VGL
function. Based on the host computer interface or application requirements,
you can set the SFCC to any decimal character from 17 through 255 (hex 11
through hex FF).
When VGL is shipped, the caret symbol (hex 5E), "^", is configured as the
SFCC. You can change the SFCC as described in your user's manual, or as
described in "Special Function Control Code Change" on page 144.
Throughout the practical examples in this manual, the SFCC is shown as a ^
(caret, hex 5E, dec 94); always use the actual SFCC required by your system
configuration wherever the ^ is shown.
In the general command formats, the SFCC is represented by (cc). Always
substitute the actual SFCC required by your system configuration in the
general command format where (cc) is shown. Do not enter parentheses with
your SFCC .
NOTE: Refer to your User's Manual for a description of SFCC selections.
Perform a configuration printout and examine the configuration option
listing to determine which SFCC is currently selected.

Command Sequence

Individual commands are made up of various command parameters (such as
character height or width parameters). Each command generally begins with
the SFCC. You can string many commands together to form a command
sequence, or command line. After the Graphics Mode is enabled by the
Graphics Mode Enable command, you can input a command sequence. The
command sequence includes all commands and data from the initial SFCC of
the first command to the sequence terminator.
The VGL buffer holds and can process approximately 64K characters in a
single graphics command sequence. However, if a single command
sequence exceeds the buffer capacity, you can use the Interrupt command
(page 106). The Interrupt command breaks the command sequence and
specifies where the sequence begins printing again.

Command Parameters

Most commands have a number of variable parameters for which input is
required. Throughout this manual, actual commands required for input are
shown exactly as they must be entered, while all the variable parameters
associated with that command are shown in italics.

Brackets

Paired brackets [ ] indicate an optional command parameter. You can choose
to use or not use such a command parameter, but do not enter the brackets in
the command sequence .
Special Function Control Code (SFCC)
21