Chapter 2
Installing SCXI Modules and Connecting the SCXI System to the DAQ Device
©
National Instruments Corporation
2-3
To connect the SCXI chassis to your DAQ device, you must connect the
appropriate SCXI cable assembly to the DAQ device and then connect the
other end to the rear connector of a single SCXI module. Use the following
procedure:
1.
Determine to which SCXI module you will connect the SCXI cable
assembly. If all modules are configured for multiplexed or serial mode,
you must cable only one module to a DAQ device. Use the following
rules to determine which is the proper SCXI module to connect to the
cable:
•
For systems containing at least one analog SCXI module:
a.
If you are using one or more SCXI-1140 modules, connect
the cable assembly to any one of the SCXI-1140 modules.
The SCXI-1140 requires a counter signal from the DAQ
device to control the track-and-hold circuitry. Cable only one
SCXI-1140 to the DAQ device because other SCXI-1140
modules in the chassis can access the track-and-hold counter
signal through the SCXIbus in the chassis backplane.
b.
If you are not using an SCXI-1140 and are using one or more
SCXI-110X module, connect the cable assembly to any one of
the SCXI-110X module. The SCXI-110X module drives only
two of the DAQ device analog input lines, leaving the other
lines available.
c.
If you are not using any SCXI-1140 or SCXI-110X modules
but are using other analog modules, connect the cable
assembly to any one of the analog modules.
•
For systems containing only digital modules (no analog modules),
connect the cable assembly to any one of the digital modules.
•
For systems containing both analog and digital modules, follow
steps a through c for connecting an analog module. Enable the
MISO and SERDATOUT lines of the module you connect to the
DAQ device. For more information see Chapter 3,
Your SCXI Hardware and Software
.
•
If the system contains any digital modules configured for parallel
mode, connect each of these digital modules to a separate DIO
device. If the system contains any analog modules configured for
parallel mode, connect each of these modules to a separate analog
DAQ device.
