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6-108 Chapter 6: Programming
Model 801GC, 801GF & 801GX¥Rev. A
DCEX Display Code EXpected
Classification: Format parameter setting
Command Syntax: DCEX <code#>
Limits: <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 10
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#>
Description: The DCEX command sets up the display code that’s 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.
Other Required Cmds: The FMTU command instructs the generator to use the new
setting. The ALLU command uses the new setting and redraws
the test image.
Example: DCBM 7 // Set mask to read sense lines
// 0, 1 & 2 only
DCEX 5 // Only lines 0 and 1 should be
// grounded
FMTU // Update hardware to current
// buffer contents