Epson LX-90TM Installation Manual download pdf (Page 33)

Pin Labels

Once the printer is in the graphics mode, your next step is to tell the

print head which pins to fire in each column. There are 128 possible

combinations of seven pins, and you send only one number for each

column. The numbering system that allows you to use a single num-

ber to specify any one of the 128 possible patterns is shown in Figure

4-1. Because only seven of the nine pins are used in the graphics mode,

only seven are shown in our diagrams.

Figure 4-1. Pin labels

To fire any one pin, you send its number plus 128. To fire more than

one pin at the same time, add up the numbers of the pins, add 128, and

send the sum to the printer. Therefore, you fire the top pin by sending

129. To fire the bottom graphics pin, you send 192. If you want to fire

only the top and bottom pins, you simply add 64, 1, and 128, then

send 193.

By adding the pin numbers together, you can fire any combination

of pins you want. Figure 4-2 shows you three examples of how to

calculate the number that will fire a particular pattern of pins.

Figure 4-2. Calculating numbers for pin patterns

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 58 59

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Epson LX-90TM Installation Manual Page 33