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Labeling the nozzles
To tell the printer which nozzles to fire in each column, you
first divide each of the vertical columns into three sections of
eight nozzles each and consider each section separately. Since
there are 256 possible combinations of the eight nozzles in each
section, you need a numbering system that allows you to use a
single number to specify which of the 256 possible patterns you
want. This numbering system is shown below:
To fire any one nozzle, you send its number. To fire more than
one nozzle at the same time, add up the numbers of the nozzles
and send the sum to the printer. With these labels for the
nozzles, you fire the top nozzle by sending 128. To fire the
bottom nozzle, you send 1. If you want to fire only the top and
bottom nozzles, you simply add 128 and 1, then send 129.
By adding the appropriate label numbers together, you can fire
any combination of nozzles.
Shown below are three examples
of how to calculate the number that will fire a particular pattern
of nozzles.
4-12 Software and Graphics