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When the signal on the output line is on, the circuit is grounded and the current
flows from the connected device to your Matrox GatorEye (the observed voltage
at the output pin will be low). When the signal on the output line is off, the circuit
is open (the observed voltage will be high if pulled high by the connected circuitry).
State of the signal on the output line
On
Off
The exact connection between your Matrox GatorEye, the connected external
device, and its power source depends entirely on the type of external device to
which you connect.
There are several types of devices to which your Matrox GatorEye can be
connected. These include:
• NPN-compatible PLC devices. These devices include all forms of external devices
that are programmable logic controllers with NPN transistor types. An
NPN-compatible PLC device has an input that is enabled when it is grounded
(sinking input). An 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 connected device disconnects.
• Transistor-transistor logic (TTL) devices. These devices expect the connected
device to provide the necessary voltage.
• Lighting controllers. These devices control illuminators to provide additional
lighting upon request. To control and power an illuminator without a lighting
controller, see the Powering and controlling a LED lighting device with
controlled-current output section, later in this appendix.
Connecting external devices to auxiliary output lines
State of the sink driver
Closed
Open
Circuit goes to
Ground
Not ground (floating)
81
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