Matrox 4Sight EV6 Installation And Hardware Reference page 40

40 Chapter 2: Getting started with your Matrox 4Sight EV6 unit
Pullup circuitry
Equivalent circuit only
In some cases, you must add pullup circuitry to connect an output device to an
auxiliary input signal; specifically, you must attach an external pullup resistor
between the voltage source and the AUX_INn+ pin.
This is required when you connect the AUX_INn- pin to the electrical return path
and the third-party output device is sinking. In this case, select a resistor value that
will not over-current the output device and provides just enough current and
voltage to your Matrox 4Sight EV6 auxiliary input signals, according to the
Matrox 4Sight EV6 electrical specifications section in Appendix B: Technical
reference. Note that you should use a resistor with an appropriate power rating for
your circuit.
Connection required if using
external pullup circuitry
+
Sensing
24V
Circuit
-
Optional because the auxiliary input signals are electrically isolated.
AUX INn+ _
AUX INn- _