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108 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 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
transistor-transistor logic (TTL) devices.
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 power source must
be provided by the connected device because the Matrox Iris GT output signals
are not capable of providing (sourcing) voltage to drive a device. In the circuit
depicted below, the connected device is terminated.
ouput signal
Matrox Iris GT
You can use a 5 V, 12 V, or 24 V power source. Each of the sink drivers of your
Matrox Iris GT uses a 100 mA resettable fuse to protect your smart camera from
connected external devices. The fuse protects your Matrox Iris GT if you
accidentally connect to an external device that requires more than 100 mA.
100 mA
Connected
External
resettable
Device
fuse
GND
Power
source
+24 V
max.
o
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