USER MANUAL

Chapter 7

The Parallel Port

7–14

If messages don’t contain variable data, the number of outputs can be

reduced. Since no variable data is transferred, both strobe lines are always

zero, or always one. In addition, some data lines (D0 - D9) could be

eliminated depending on the highest message number used.

Figure 7.3 illustrates this method.

Figure 7.3

11 Ouput Configuration

D9 D8 D6 D5 D4 D3 D2 D1 D0 MS0 MS1 GND

11A 11B 12 13 14 15 16 17 18 19 21 20 23

Terminal

Number

Terminal Block

Designation

Power Supply

5-30 VDC

(Observe DC

Polarity)

PC Outputs (11)

You can further reduce the output requirements by tying the strobe lines high

as shown in Figure 7.4

Figure 7.4

10 Output Configuration

Tie Together

For HIGH

TRUE Logic

Only

D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 MS0 MS1 GND