Chapter 3
Configuring Your SCXI Hardware and Software
3-24
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the lower eight channels configured as current output channels. Other
major features of this module include software-programmable gain and
filtering, and the ability to account for voltage drop of long lead wires in
strain-gauge measurement. The SCXI-1122 input signals are multiplexed
to a single output, which drives a single DAQ device channel.
The SCXI-1122 has two jumpers. Jumper W2 connects a pullup resistor
to the SERDATOUT signal on the rear signal connector as shown in
Table 3-17. Jumper W1 configures the guard and the analog output ground
and enables the NRSE mode. Filter bandwidth and scanning mode, both
two-wire or four-wire, is software configured.
Use the following procedure to configure your SCXI-1122 module.
Note
If the module is not connected to a DAQ device, the position of W2 is irrelevant.
1.
When using a single chassis, set jumper W2 in position 1 on the
SCXI-1122 that is connected to the DAQ device. When using multiple
chassis, set jumper W2 to position 1 on only one of the SCXI-1122s
that are cabled to the DAQ device. It does not matter which of the
SCXI-1122s cabled to the DAQ device has the pullup connected.
Set jumper W2 in position 3 on all of the other SCXI-1122 modules.
Table 3-17.
SCXI-1122 Digital Signal Jumper Configurations
Jumper
Description
Configuration
Position 1 (pullup)—Use this setting for a
single-chassis system. Connects a 2.2 k
Ω
pullup
resistor to the SERDATOUT line (factory-default
position).
Position 3 (unmarked position, no pullup)—Use this
setting for additional cabled SCXI-1122 modules in
a multichassis system. No pullup resistor is
connected to the SERDATOUT line.
W2
W2
1
W2
1
