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Connecting to a TTL device
To connect your Matrox GatorEye to a device that only accepts TTL signals, you
must use an external voltage source because TTL devices expect to be connected
to a sourcing signal and the output signals of your Matrox GatorEye are sinking
signals. If using a 24 V voltage source, you must first connect an external voltage
divider between them. Select a voltage divider whose resistors reduce the voltage
such that the connected third-party device receives 5 V.
❖ Note that resistors rated for ¼ W are recommended, since they can handle the
expected power.
Then, connect the voltage input wire of your external voltage divider to the 24 V
voltage source, and connect the ground of your voltage divider to the ground of
your camera.
Matrox GatorEye
digital I/O and
power connector
If using a different voltage than 24 V, replace 24 V in the above formula
accordingly. If the external voltage source is 5 V, use a pull-up resistor instead of
a voltage divider. For more information, refer to Connecting to a lighting controller
subsection, later in this section.
Connecting external devices to auxiliary output lines
R
×
------------------ -
V
=
24V
0
R
1
External
+24 V
voltage
divider
R
3 KΩ
1
Line5
R
800 Ω
2
GND
2
+
R
2
V
0
Third-party
TTL device
5 V
85
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