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5-7
Some computers and video controller cards look for
the display codes and automatically adjust their hard-
ware to output an appropriate video signal format
for the display that is connected.
Problems can occur if a display outputs the wrong
code and it is connected to a computer having an
automatic format adjustment feature. The wrong sig-
nal may be generated and the display may appear
to be broken.
The 801G* is capable of checking the status of the
code pins in its D-sub connectors. These pins are
identified as M0 through M3 in table 5-1. Each sig-
nal format in the 801G* can be independently set-
up to test one or more of the display code pins. The
formats also can be set-up with the expected code.
The “Format” test image shows both the expected
code and the code that is read as a single hexidecimal
numbers. The following table shows the equivalent
hex code values for all possible input combinations.
A “0” indicates a grounded or logic low input and
“1” indicates either a floating or logic high input
❖ The 801G* merely reads and displays the code.
It does not automatically select or modify signal
format data based on the code.
Some of the built-in industry standard formats have
been set-up to check for the proper codes. The fol-
lowing tables list the formats and the expected iden-
tification codes. The tables also show which pins
need to be open (1) or grounded (0) to create the
correct code.
Table 5-2
Display Code Values
for all Sense Line
Combinations
Checking a
Display Code
Code M3 M2 M1 M0 Code M3 M2 M1 M0
0 0000 8 1000
1 0001 9 1001
2 0010 A 1010
3 0011 B 1011
4 0100 C 1100
5 0101 D 1101
6 0110 E 1110
7 0111 F 1111
Display Connection & Display Codes