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88 Appendix E: Using the I/O lines and controlled- current output of Matrox GatorEye
In the following example, the lighting controller expects a 5 V TTL input line. A
24 V voltage source is used to supply the voltage for the illuminator trigger input.
As a result, a voltage divider is required to drop the voltage to 5 V.
Matrox GatorEye
digital I/O and
power connector
Line5
GND
❖ Note that resistors rated for ¼ W are recommended, since they can handle the
expected power.
R
2
×
------------------ -
V
=
24V
0
R
+
R
1
2
External
+24 V
voltage
divider
R
3 KΩ
1
V
0
Trigger input
5 V
R
800 Ω
2
GND
Lighting controller
+V
+V
Illuminator
-
-
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