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Scanning color (bits 2 and 3)
These bits indicate the scanning color. When monochrome is selected,
these bits indicate the dropout color (if a dropout color is selected).
Byte counter
The byte counter indicates the number of data bytes contained in each
data line. The counter consists of two bytes (an upper and lower byte);
the value of the counter is determined according to the following
formula:
(number of data bytes) = (lower byte) + (256 × (upper byte))
Make sure that your program checks the byte counter in each data
block and receives all data sent by the scanner. If the computer does
not accept all data, the scanner goes into a waiting state.
Line counter
When in block data transfer mode, this counter indicates the number
of lines of image data in the block. When in color line scanning mode,
data is organized in successive lines of green, red, and blue data (in
that order). Each color is counted as a separate line, so the line counter
must be a multiple of three. For example, n lines of color data result in
a line counter equal to 3n.
Command Usage 2-29