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128
64
32
16
8
4
2
1
not used
Figure 9-1. Pin labels
To fire any one pin, you send its number. To fire more than one
pin at the same time, add up the numbers of the pins and send the
sum to the printer. With these labels for the pins, you fire the top pin
by sending 128. To fire the bottom graphics pin, you send 1. If you
want to fire only the top and bottom pins, you simply add 128 and 1,
then send 129.
By adding the appropriate label numbers together, you can fire any
combination of pins you want. Figure 9-2 shows you three examples
of how to calculate the number that will fire a particular pattern of
pins.
I
128
64
32
16
8
4
2
1
128
64
32
16
8
4
2
1
not used
4
not used
128
16
2
128
64
32
16
8
4
2
1
not used
64
8
2
Figure 9-2. Calculating numbers
for
pin patterns
75