Chapter 4
Theory of Operation
©
National Instruments Corporation
4-11
Multiplexed mode is also useful for performing scanning operations with
the SCXI-1120/D. The MIO devices, Lab-PC+, and the 1200 Series DAQ
devices all support scanning. The SCXI chassis is programmed with a
module scan list that dynamically controls which module sends its output
to the SCXIbus during a scan. You can specify this list to scan the modules
in any order, with an arbitrary number of channels for each module entry in
the list. However, the channels on the SCXI-1120/D must be scanned in a
consecutive, ascending order (after channel 7 is scanned the module wraps
back to channel 0 and continues). You can program the SCXI-1120/D to
start scans with any channel.
Note
The SCXI-1120/D parallel outputs continuously drive the RSC pins even when the
module is configured in multiplexed mode.
