
Chapter 14 SCXI Hardware
DAQ Hardware Overview Guide 14-22 www.ni.com
cannot read the temperature sensor on the SCXI-1320 terminal block
if the SCXI-1320 is in the DTEMP configuration.
• The SCXI-1121 module drives analog input channels 0 to 3, even if you
are operating the module in multiplexed mode. In addition, if the
temperature sensor on the terminal block is in the DTEMP
configuration, the SCXI-1121 also drives analog input channel 4. The
SCXI-1200 cannot read the temperature sensor in DTEMP mode
because it reads all analog voltages off the analog lines of the SCXIbus
backplane.
• The SCXI-1122 module drives analog input channel 0 of the DAQ
device; if you use the SCXI-1300 terminal block with the temperature
sensor in the DTEMP configuration, the SCXI-1122 also drives analog
input channel 1. The SCXI-1200 cannot read the temperature sensor in
DTEMP mode because it reads all analog voltages off the analog lines
of the SCXIbus backplane.
• The SCXI-1140 module drives analog input channels 0 to 7, even if you
are operating the module in multiplexed mode.
• The SCXI-1141, SCXI-1142, and SCXI-1143 modules drive analog
input channels 0 to 7, even if you are operating the module in
multiplexed mode.
DIO-24 and the DIO-96
The DIO-24 and DIO-96 digital I/O devices work with the digital modules
and analog output modules. It is important to remember that when a digital
I/O device is cabled to an SCXI module, some of the device I/O pins, and
therefore some of the device resources, are reserved for SCXI use. SCXI
reserves the following DIO-24 and DIO-96 resources when cabled to a
digital or analog output module in multiplexed mode:
• DIO-24 digital I/O lines PB0 to PB3 and the DIO-96 digital output
lines APB0 to APB3 are the output communication lines to SCXI.
The entire port is reserved by NI-DAQ.
• DIO-24 digital I/O line PA0 and DIO-96 digital I/O line APA0 are the
input communication lines from SCXI. The remaining lines of these
ports are available only for input.
When you cable a DIO-24 to an SCXI-1162, SCXI-1162HV, SCXI-1163,
or SCXI-1163R in parallel mode, the 24 digital lines on the DIO-24 are
directly connected to channels 0 through 23 on the module; you cannot
access channels 24 to 31 on the module in parallel mode with a DIO-24.
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