HP 5961-0509 manual Transfer Raster Data Command

Transfer Raster Data Command

The Transfer Raster Data command is used to transfer a row of raster data to the printer.

		EC * b # W [raster data]
	Default	=	N/A
	Range	=	0 - 32767
	The value field (#) identifies the number of bytes in the raster row.
	These bytes are interpreted as one row of raster graphics data that
	is printed at the current Y position at the left raster graphics margin.
	Upon completion of this command, the cursor position is at the
	beginning of the next raster row at the left raster graphics margin.
	Within the raster data, each bit describes a single dot. The most
	significant bit (bit 7 is the most significant, bit 0 is the least significant)
	of the first byte of data corresponds to the first dot within the row. If a
	bit is set to 1, the corresponding dot is printed. Each dot of the raster
	data is expanded according to the specified raster resolution.
	Raster graphics is independent of the text area and perforation skip
	mode – these boundaries are ignored.
	Raster graphic images, raster height, and raster width are limited to
	the printable area; images that extend beyond the printable area are
	clipped.
Note	The byte count of the value field in the Transfer Raster Data
	command has precedence over the literal or the command byte,
	byte count. For example, the command,

EC*b2m3W [binary data]

sets compression method=2 and sends 3 bytes of raster data for the row. Suppose the binary data appears as follows:

00000010 00000001 00000001 00000001

The control (first) byte value of +2 indicates that 3 bytes of literal (unencoded) raster data will follow. The Transfer Raster Data command, however, specified only three bytes total (including the control byte) in the raster row. The control byte and the following two data bytes are read, and the remaining data byte is ignored.

EN Transfer Raster Data Command 15-29