Matrox Iris GT MIL, Installation And Technical Reference, Page: 109 / 256

Connecting external devices to auxiliary output signals 109
When the auxiliary output signal is on, the circuit is grounded and the current
flows from the connected device to your Matrox Iris GT; when the signal is off,
the circuit is open.
The exact connection between your Matrox Iris GT, the connected external
device, and its power source depends entirely on the type of external device to
which you connect.
• NPN-compatible PLC devices . These devices include all forms of external devices
that are programmable logic controllers with NPN transistor types. A
NPN-compatible PLC device has an input that is enabled when it is grounded
(sinking input). A NPN-compatible PLC device does not provide power to the
connected device.
• PNP-compatible PLC devices . These devices include all forms of external devices
that are programmable logic controllers with PNP transistor types. A
PNP-compatible PLC device has an input that is enabled when it receives a voltage
(sourcing input).
• Inductive load devices . These devices include all forms of external devices that
have inductor wiring, such as a relay or small motor. Devices connected to an
inductive load device require a diode to protect them from over-voltage.
Over-voltage typically occurs when the inductive load device starts or when the
connected device disconnects. An inductive load device does not provide power
to the connected device.
• Transistor-transistor logic (TTL) devices . These devices expect the connected
device to provide the necessary voltage. Note that a TTL device can be used as
either an input or an output device.
• Light controllers . These devices control lighting devices to provide additional
lighting upon request. Note that you can control a light controller (for example,
a strobe light controller) with either Matrox Iris GT auxiliary output signal 4 or
5. To control and power a lighting device without a light controller, see the
Powering and controlling a LED lighting device with the Matrox Iris GT
controlled-current output
section, later in this appendix.
State of the output signal State of the sink driver Circuit goes to
On Closed Ground
Off Open Not ground (floating)