Quantum Data 802R User's Guide download pdf (Page 284)

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274 Appendix A Command Reference

DCEX

Display Code EXpected

Class Format parameter settings

Description Sets up the display code that is expected from a display connected to the generator. The

code is determined by one or more sense lines being connected to ground by the display.

Many video controller cards for the Apple Macintosh II and VGA type cards for the IBM-PC

sample the status of the display code sense lines. The information then sets up one of

several different operating modes to match a particular display. An improper display code

may make the controller card or display appear to malfunction.

The DCEX? query first performs a logical AND operation with the display code bit mask

and the actual display code that's sensed. The decimal equivalent of the result then is

returned. The mask is set with the DCEX command.

The expected setting and the actual result are both shown in the Format test image. They

have no effect how a given format generates a set of test signals.

Command syntax DCEX code

code

0 = 0 0 0 0 8 = 1 0 0 0

1 = 0 0 0 1 9 = 1 0 0 1

2 = 0 0 1 0 10 = 1 0 1 0

3 = 0 0 1 1 11 = 1 0 1 1

4 = 0 1 0 0 12 = 1 1 0 0

5 = 0 1 0 1 13 = 1 1 0 1

6 = 0 1 1 0 14 = 1 1 1 0

7 = 0 1 1 1 15 = 1 1 1 1

Query syntax DCEX?

Query response code

Other required

commands

The FMTU command instructs the generator to use the new setting. The ALLU command

updates hardware to the new setting and redraws the test image.

Example

DCBM 7 // Set mask to read sense lines 0, 1 and 2 only

DCEX 5 // Only lines 0 and 1 should be grounded

FMTU // Update hardware to current buffer contents

1 2 ... 279 280 281 282 283 284 285 286 287 288 289 ... 743 744

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Quantum Data 802R User's Guide Page 284

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