Matrox Iris GTX Series, Инструкция по установке и техническое руководство, Страница: 28 / 100

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Chapter 2: Powering and connecting to your Matrox Iris GTX
Connecting to the auxiliary I/O interface
Matrox Iris GTX has an auxiliary I/O interface with 7 optically isolated auxiliary
signals. Four are inputs that support sinking and sourcing configurations and can
receive 24 V. Three are outputs that support sinking configurations and operate
at up to 24 V nominal; you could connect one of the outputs in a sourcing
configuration, but the other two outputs would no longer be available. Matrox
Iris GTX also has an analog intensity (dimming) control signal, which is discussed
in the
Connecting a light controller and the analog intensity control signal section
later in this chapter.
Note that sinking and sourcing concepts refer to the conventional current flow ,
which means current flows from the positive potential towards the negative
potential. A sinking device provides a path to
sink current towards ground or to
the return path; a sinking device does not provide power. A sourcing device
provides a path that sources current; it provides a path from the power source. In
the following diagram, the device on the right is the sourcing device, and the device
on the left is the sinking device.
When setting up auxiliary I/O, be aware that you need to configure these pins on
the software side as well. If you are using Matrox Design Assistant, refer to the
Connecting to your Matrox Iris GTX as your runtime platform section of the Matrox
Iris GTX appendix in the Matrox Design Assistant help file for this information.
Equivalent circuit only
Vcc
Sourcing
device
Sinking
device
+
+
-
-