Printek FormsMaster 8000, Руководство программиста

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5
ANSI X3.64 EMULATION
Introduction
This section describes the control codes and escape sequences comprising ANSI X3.64 emulation.
This emulation may be selected by setting “Emulation” to “ANSI X3.64” in the appropriate interface
setup menu, or via software with the
ESC ESC 1 sequence. While this emulation is selected, control
codes and escape sequences from other emulations are not available.
Control codes and escape sequences are used to control printer operation. An ASCII control code is a
single character in the range 00 hex through 1F hex, and 7F hex. The
ESC (Escape) control code (1B
hex) is used to introduce character strings called escape sequences, which provide an extension of the
commands available with ASCII control codes.
Many ANSI escape sequences begin with a two character Control Sequence Introducer (CSI), Escape
Left Square Bracket (
ESC [ , 1B 5B hex). If 8-bit data is selected via control panel setup, these two
characters may be replaced by a single character CSI, 9B hex. The sequences are always documented
in this section with the two character CSI (
ESC [ ), because this format seems to be much more
common, and works equally well with 7-bit or 8-bit data.
Some escape sequences accept one or more numeric parameters. A numeric parameter is a decimal
number represented by a string of ASCII decimal digits (“0” through “9”). Leading zeros may be
supplied, but are not necessary. Due to implementation constraints, the largest value that can be
accepted is decimal 255. Larger values will be treated as zero. Omitting a numeric parameter is
equivalent to supplying a value of zero.
If a sequence accepts one numeric parameter, it will be represented as “ n ”. If a sequence accepts more
than one numeric parameter, they will be represented as “ n1; n2; ... nx ”. Note that multiple numeric
parameters are separated by a semicolon.
Most ANSI escape sequences will assume one of the following formats:
ESC f (no numeric parameters)
ESC n f (one numeric parameter)
ESC n1; n2; ... nx f (two or more numeric parameters)
The “ f ” at the end of the escape sequence represents the final character. It terminates the sequence, and
specifies the function to be performed.
Spaces are used when documenting escape sequences to increase readability. The spaces within the
sequences are for readability only; they are not part of the sequences themselves. Characters that
appear in
italics (such as “ n ” and “ f ” above) are not sent to the printer as is; they are used as a place
holder indicating that some value must be supplied.
Multiple character strings without intervening spaces typically represent control codes. For example,
BS is the Backspace control code (08 hex), not the two characters “B” and “S” (42 and 53 hex). An
ASCII Control Code Table is prvided on page 139 for your convenience. If you have any doubt about
how to interpret a documented control code or escape sequence, refer to the hex representation in the
example. This should clarify any ambiguity. The examples may also be helpful when analyzing a hex
dump (see Hex Dump chapter) printed by the printer.