Switches reference 139
The IN_COM selector switch (SW2) has a direct effect on the on-board input
common LED (DS4). The following table explains the relationship.
OUT_COM selector switch
The OUT_COM selector switch (SW3) allows you to provide the common return
path internally when the auxiliary output signals of your Matrox Iris GTR are
sinking.
IN_COM selector switch
state (SW2)
Matrox Iris GTR auxiliary input signal
mode
Connected signal of the third party
device
On-board input common
LED (DS4)
+VDC Sourcing Sinking On
-VDC Sinking Sourcing Off
Switch State Description
SW3 OPEN Specifies that output common is provided externally. Connect the output connector’s (J6) OUT_COM wire-terminal to the
return path for your circuit for a sinking output. The output connector’s (J6) OUT_COM wire-terminal can also be used in
conjunction with an auxiliary output signal as a sourcing output; in this case, OUT_COM connects to the input pin of the
third-party device and the voltage source connects to the one of the output connectors (J6) OUT wire-terminals.
-VDC Specifies that output common is provided internally. Your Matrox Iris GTR breakout board will provide the electrical return
path for the auxiliary output signals. This setting can only be used when the auxiliary output signal is sinking.
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