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28 Chapter 2: Connecting Matrox Breakout Box
When the expected
voltage is not
supplied
For example, if the external voltage, +V
expects a 5 V input signal with 5 mA of current, you should use a 1 KΩ
resistor. The expected power would be 25 mW. In this case, it is
recommended that you use a resistor rated for ¼ W, which is sufficiently
higher than the expected power.
If the external power supply outputs a voltage that is different from what the
➠
lighting controller expects, you must add an external voltage divider between
the power supply and the lighting controller.
In the following example, the lighting controller expects a 5 V TTL input
signal. The 24 V output of the Matrox Breakout Box module is used to
supply the strobe signal voltage. As a result, a voltage divider is required to
drop the voltage to 5 V.
24V
Aux4
Aux5
Aux6
Aux7
LED+
LED-
GND
Matrox Breakout Box
Direct output connector
Note that resistors rated for ¼ W are recommended, since they can handle
❖
the expected power.
You can use this configuration whether you are using the Matrox
Breakout Box's 24 V output or another external power supply.
, is 5 V, and your lighting controller
ext
R
2
×
------------------ -
V
=
24V
0
R
+
R
1
2
External
+V
voltage
divider
+V
5 V
+
Digital In
-
V
0
GND
Lighting controller
+
Illuminator
-
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