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COMMAND CODES
Carriage Return
Code Sequence: CR
Prints any remaining data in the character line buffer while advancing the paper one character line
then returns the character pointer to the beginning of the print line. This code is ignored if paired with
an LF.
Line Feed
Code Sequence: LF
Prints any remaining data in the character line buffer while advancing the paper one character line
and leaves the character line pointer at its current position. This code is ignored if paired with a CR.
Form Feed
Code Sequence: FF
This command code works in conjunction with the current FF Eject Control data. The printer will first
print any remaining data in the character line buffer then if the FF Eject Control is enabled, will
advance to the next Top-of-Form. If the FF Eject Control is disabled, the printer will not perform the
ToF advance.
Raster Graphics
Code Sequence: Esc_R
This sequence is issued in a larger construct, as explained in detail below.
OVERVIEW
The printer uses a printer independent raster protocol. The protocol is graphic in nature to support the
direction of image printing technology.
The general protocol supports Black and White printers, grayscale printers, two color printers, and full
color printers (both three and four pen color devices). This is accomplished by incorporating two
parameters in the raster packet: number of pens, and resolution per pen. Since the Interceptor 800
series printers are Black and White thermal technology only, the user may disregard references to all
other forms of printing in this description.
The protocol is defined in terms of pixels (there are no units). It is required that the raster graphics
generator have knowledge of the printer resolution in order to properly scale the image, however there
is no constraint on the raster graphics generator output being tied to a specific printer resolution.
There is also no constraint on the image or page width. This means that a file generated for an 8 inch
200 dpi printer can be printed on a 2 inch 150 dpi printer.
The Printrex Raster Graphics Protocol is a raster-line based protocol. This means one entire raster
line is embodied in a single structured packet. All of the information required for printing the raster
line is included within the packet. Submitting multiple raster packets prints an entire image.