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40 Chapter 2: Getting started with your Matrox 4Sight GPm unit
Matrox 4Sight GPm
auxiliary I/O connector
Outputs sink up to 100 mA.
All grounds on this unit share a common ground.
Connecting to a TTL device
Connect your Matrox 4Sight GPm to a TTL device as shown below. If using a
24 V voltage source, you require an external voltage divider between the TTL
device and your Matrox 4Sight GPm. Select a voltage divider whose resistors
reduce the voltage such that the connected device receives 5 V.
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.
❖ Note that your TTL device and your Matrox 4Sight GPm unit must share a
common ground.
V
24V
=
0
Power source
24 V
+
External
voltage
divider
R
3 KΩ
1
Output
signal
R
800 Ω
2
R
2
------------------ -
×
R
R
+
1
2
TTL device
V
0
Device input
5V
GND
Equivalent circuit only
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