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84 Appendix D: Using the I/O signals and controlled-current output of Matrox Iris GT
Input and output connector
This appendix examines the requirements when connecting devices to the Matrox
Iris GT digital I/O and power connector. For the rise and fall time, pulse width,
maximum frequency, and power characteristics of the I/O signals, refer to the
Matrox Iris GT specifications section, in Appendix B: Technical Reference.
Connecting external devices to auxiliary
output signals
You can send auxiliary output signals of your Matrox Iris GT 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 signals of your Matrox Iris GT uses an open collector
(sink driver); 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 Iris GT output signals are
not capable of providing (sourcing) voltage to drive a device. In the circuit depicted
below, the device connected to the Matrox Iris GT smart camera is terminated.
output signal
Matrox Iris GT
Equivalent circuit only
Your Matrox Iris GT supports a nominal voltage of 24 V. Each of the sink drivers
of your Matrox Iris GT uses a resettable fuse to protect your smart camera from
connected external devices. The fuse tries to protect your Matrox Iris GT if you
accidentally connect it to an external device that provides more amperage than
your Matrox Iris GT can safely ground; the amount of current from which the
fuse can protect is 100 mA.
100 mA
Connected
External
Device
resettable
fuse
GND
External
device
power
source
o
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