National Instruments SCXI-1121 - Manual (Page 81)

Chapter 3 Theory of Operation
© National Instruments Corporation 3-19 SCXI-1121 User Manual
Figure 3-9. Single-Module Multiplexed Scanning (Indirect)
Multiple-Module Multiplexed Scanning
In this mode, all the modules tie into Analog Bus 0, and SCANCON
enables the output of their amplifiers. The module that is directly cabled to
the data acquisition board sends SCANCLK onto TRIG0 for the other
modules and Slot 0, as illustrated in Figure 3-10. The scan list in Slot 0 is
programmed with the sequence of modules and the number of samples per
entry.
Figure 3-10. Multiple-Module Multiplexed Scanning
Cable
Assembly
Data Acquisition Board
Analog Input
Timing Output
Other
Module
Analog Bus 0
SCANCON X
TRIG0
SCANCLK
MCH0
SCXI-1000 or SCXI-1001 Chassis
SLOT X
SLOT 0
SCXI-1121
SCANCLK
MCH0
Cable Assembly
Data Acquisition Board
Analog Input T
iming
Output
SLOT A SLOT B
SLOT 0
SLOT X
TRIG0
SCANCON A
SCANCON B
SCANCON X
SCXI-1000 or SCXI-1001 Chassis
Analog Bus 0
SCXI Module SCXI Module SCXI Module