Connecting to the I/O Interface
System Components
2
HAWK MV-4000 Smart Camera Guide 2-29
Pull-Up Circuitry
In some cases, you must add pull-up circuitry to connect an output device to an input
signal; specifically, you must attach an external pull-up resistor between the voltage
source and the Input pin.
This is required when you connect the Input Common pin to the electrical return path and
the third-party output device is in a sinking configuration. In this case, select a resistor
value that will not overcurrent the output device and instead provide just enough current
and voltage to your HAWK MV-4000 input signals, according to the electrical
specifications subsection in Appendix C: General Specifications. Note that you should use
a resistor with an appropriate power rating for your circuit.
(Equivalent circuit only.)
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