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80 Appendix E: Using the I/O lines and controlled- current output of Matrox GatorEye
Input and output connector
This appendix examines the requirements when connecting devices to the Matrox
GatorEye digital I/O and power connector. For the rise and fall time, pulse width,
maximum frequency, and power characteristics of the I/O lines, refer to Matrox
GatorEye specifications section, in Appendix B: Technical Reference.
Connecting external devices to auxiliary
output lines
You can send output signals of your Matrox GatorEye to a wide variety of external
devices, such as programmable logic controllers (PLC) and devices that only accept
transistor-transistor logic (TTL) signals for their trigger inputs.
Each of the auxiliary output lines of your Matrox GatorEye is an open collector
(sink driver) output line; instead of transmitting a high or low voltage state, a
current from a connected device is either terminated (grounded) or not. The
connected device must have its own power source because the Matrox GatorEye
output lines are not capable of providing (sourcing) voltage to drive a device. In
the circuit depicted below, the device connected to the Matrox GatorEye camera
is terminated.
output line
Matrox GatorEye
Equivalent circuit only
Your Matrox GatorEye supports a nominal voltage of 24 V. Each of the sink drivers
of your Matrox GatorEye uses a resettable fuse to protect your camera from
connected external devices. The fuse tries to protect your Matrox GatorEye if you
accidentally connect it to an external device that provides more amperage than
your Matrox GatorEye can safely ground; the amount of current from which the
fuse can protect is 100 mA.
100 mA
Connected
External
resettable
Device
fuse
GND
External
device
power
source
o
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