Chapter 3
Configuring Your SCXI Hardware and Software
3-32
www.ni.com
4.
If you are using any digital SCXI modules in serial mode and will
connect the SCXI-1140 module to the DAQ device, configure the
SCXI-1140 module to connect the MISO signal to the SERDATOUT
pin (jumper W11). See the SCXI-1140 User Manual for details.
SCXI-1141, SCXI-1142, and SCXI-1143 Modules
The SCXI-1141, SCXI-1142, and SCXI-1143 have eight lowpass filters
with differential input amplifiers. The filter types of the modules are
elliptic, Bessel, and Butterworth, respectively. You can use the SCXI-1141,
SCXI-1142, and SCXI-1143 for antialiasing applications as well as for
general-purpose amplification and filtering of signals.
The SCXI-1141, SCXI-1142, and SCXI-1143 have two user-configurable
jumpers. Jumper W1 is set at the factory for a single-chassis system, and
jumper W2 is set at the factory for a differential input DAQ device.
Note
You need to change the SCXI-1141/1142/1143 jumper configuration only if or when
you are using a multichassis system, when using a DAQ device in SE mode, or to change
the default grounding and shielding configuration.
6
U18
7
U19
Table 3-24.
SCXI-1140 Switch Settings for Gain Selection
Switch
Desired Gain
Closed Switches
1
10
100
200
500
None
D
C
B
A
Table 3-23.
SCXI-1140 Gain Switches for Each Channel (Continued)
Channel
Use DIP Switch
OFF
1
2
3
4
A B C D
Switch is shown in factory-default (gain = 1) position.
