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Controlling The Printer; The Control Panel; Control Codes; Escape Sequence - Brother HL-1050 Technical Reference Manual

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2/19/04
5.

CONTROLLING THE PRINTER

Commands are invoked using either control codes or escape sequences. You can send them to the
printer as part of a program using the same command that you would use to print a string on the printer.
For example in BASIC you would use the LPRINT command.
The printer's control panel can also be used to set various operating parameters. Try to ensure that the
control panel settings and computer generated settings do not conflict with one another, or you may not
get the results you require.
5.1.

The Control Panel

Refer to the printer User's Guide for a description of how to use the printer's control panel switches.
You should be aware, however, that the following can be set using the control panel: automatic line feed
(a line feed is performed with every carriage return), auto mask (two-line top and bottom margins are
automatically used on every page), paper size, top, bottom, left and right margins, the number of lines of
text per page, orientation (portrait or landscape), the current font and the emulation mode. Conflict
between control panel settings and the settings you establish with software commands (or from
applications software) is by far the most likely cause of unexpected printing results. Use this manual in
conjunction with the printer User's guide to resolve these conflicts.
5.2.

Control codes

Control codes are ASCII codes that instruct the printer to perform a particular operation, such as a line
feed. You can send a control code to the printer by sending the same type of instruction you would use
to print a character using its ASCII code number. For example, the ASCII code for a form feed is 12, so
to make the printer perform a form feed use the following BASIC statement:
LPRINT CHR$(12);
The CHR$ operator is normally used to convert an ASCII code into its corresponding character.
5.3.

Escape sequence

Escape sequences tell the printer what Epson FX-850 mode function to perform. An escape sequence
consists of the Esc character followed by one or more characters which define the operation to be
performed. Send an escape sequence to the printer by sending the same type of instruction you would
use to print characters using their ASCII codes. Some escape sequences require parameter values or data
following them, for example, commands which turn a particular feature on and off, or commands for
printing graphic images. Numerical parameter data, too, is sent to the printer as if it were a character
code to be printed. For example, to move the print position to the third column position on the page the
required escape sequence is Esc HT 3. In BASIC this would be:
LPRINT CHR$(27); CHR$(9); CHR$(3);
In some instances where a numerical parameter can only take the values 0 or 1, you have a choice
between sending the number or the character code itself as the numerical parameter. Hence you can use
CHR$(0) or CHR$(48) to represent 0, and use CHR$(1) or CHR$(49) to represent 1. The practice of
using character code numbers CHR$(48) and CHR$(49) is not recommended, however, as it is not
conducive to clear programming and, in any case, is not universally available on commands whose
parameters can only be either 0 or 1.
CHAPTER 6 EPSON - 8

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