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Data Acquisition Board
Input Ch. N
Input Ch. 1
Input Ch. 0
Timing Output
© National Instruments Corporation
Multiple-Chassis Scanning
In this mode, you attach each SCXI-1001 chassis to a daisy chain of cable
assemblies and multichassis adapter boards, as illustrated in Figure 3-11.
You program each chassis separately, and each chassis occupies a
dedicated channel of the data acquisition board. Within each chassis,
scanning operations act as if the other chassis are not being used, with
one exception. You must program the Slot 0 scan list in each chassis with
dummy entries of Slot 13 to fill the samples when the data acquisition board
will be sampling another chassis or data acquisition board channel. This
will keep the chassis synchronized. Notice that you can only perform
multiple-chassis scanning with the SCXI-1001 chassis and MIO-16 data
acquisition boards. Refer to Chapter 5, Programming, for more
information on multiple-chassis scanning. Refer to Appendix E,
SCXI-1121
Cabling, for more information on the necessary cable
accessories for multichassis scanning.
Multichassis
Cable
Adapter
Assembly
Chassis 1
Figure 3-11. Multiple-Chassis Scanning
Multichassis
Adapter
Cable
Assembly
Chassis 2
3-17
Chapter 3
Theory of Operation
Multichassis
Adapter
Cable
Assemblies
Chassis
Chassis N
SCXI-1121 User Manual
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