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34 Chapter 2: Hardware installation
+
5V
isolated*
–
Matrox Indio output
*
For this configuration, TTL output mode must be enabled
Optional because the auxiliary output signals are optically isolated.
Equivalent circuit only
Connecting an auxiliary output signal to a TTL-compatible input
Connect a Matrox Indio auxiliary output signal to a TTL-compatible input, as
shown below.
In this configuration, TTL output mode must be enabled. To do so, you must
install a jumper on pins 3-4 of the auxiliary signal's output mode connector; for
information, refer to the Input and output mode connectors subsection of the Matrox
Indio connectors section, in Appendix B: Technical information. In addition, you
must externally connect the TTL_COM pin of the auxiliary I/O connector to
both the AUX_OUT- pin of the auxiliary output signal and the return path pin
of the input. Note that the return path pin is often labeled GND.
300 Ohm*
AUX_OUT+
AUX OUT
_
TTL COM
_
–
INPUT
RTN
Device with a
TTL input
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