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
Summary of Contents for 802BT
Page 1: ...802BT 802R Video Test Generator User Guide ...
Page 52: ...42 Chapter 2 Testing Video Displays ...
Page 62: ...52 Chapter 3 Administrative Tasks ...
Page 118: ...108 Chapter 7 Using GPIB Interface ...
Page 194: ...184 Chapter 10 Testing EDID ...
Page 204: ...194 Chapter 11 Testing HDCP ...
Page 214: ...204 Appendix A Command Reference Commands by name ...
Page 595: ...Video Test Generator User Guide 585 ...
Page 611: ...Video Test Generator User Guide 601 ...
Page 612: ...602 Appendix A Command Reference ...
Page 716: ...706 Appendix B Image Reference ...
Page 744: ...734 Appendix C Error Messages ...