Appendix A
SCXI Troubleshooting and Common Questions
A-4
www.ni.com
now using four MIO device scan list entries instead of just one. For more
complicated gain distributions, your MIO device scan list will be longer.
In LabVIEW, use the channel list strings and input limits arrays to specify
your gain distribution. You do not need to set the SCXI-1100 gain in the
configuration utility; the Analog Input VIs determine the best module gain
and MIO device gains for you based on your input limits. Put two entries in
the channel list array–
OB0 ! SC1 ! MD1 ! 0:7,
and
OB0 ! SC1 !
MD1 ! 8:31
. Put two entries in your input limits cluster array. Set the first
element limits to
{-0.1 to 0.1}
and the second element limits to
{-0.01 to 0.01}
. Using the
OB0
specifier in your channel strings causes
the Analog Input Hardware Config VI to modify the onboard MIO device
gains as well as the SCXI module gain. The group channel settings array
that the Analog Input Hardware Config VI returns shows the input limits
and total gain for each channel, so you can verify your gain distribution. If
your gain distribution results in an MIO device scan list that is too long for
your MIO device, the Analog Input Hardware Config VI returns the
-100370 error code (badScanListError).
I have four SCXI-1140 modules and one SCXI-1100. Which module
should I connect to my DAQ device?
Connect one of the SCXI-1140 modules to your DAQ device to ensure that
the track-and-hold signal from a counter on your DAQ device has a path to
the SCXIbus. Other SCXI-1140 modules can obtain this signal from the
backplane.
I have two SCXI-1100 modules and an SCXI-1340 cable assembly,
which has three 50-pin connectors. I know I should connect one end of
the cable assembly—the end with a single connector—to my DAQ
device. The other end of the cable assembly has a female connector,
which I plug into one of the modules, and a male connector. What do I
do with that male connector?
Nothing, usually. The extra male connector on a cable assembly is called
the breakout connector. You can use the breakout connector, in conjunction
with the SCXI-1180, SCXI-1181, or SCXI-1351, to access unused DAQ
device signals.
