Chapter 3
Configuring Your SCXI Hardware and Software
3-52
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Analog Output Configuration
The SCXI-1200 has two channels of analog output voltage available at the
front I/O connector. You can configure each analog output channel for
either unipolar or bipolar output. A unipolar configuration has a range of 0
to 10 V at the analog output. A bipolar configuration has a range of –5 V to
+5 V at the analog output. In addition, you can select the coding scheme for
each DAC as either two's complement or straight binary.
If you select a bipolar range for a DAC, the two’s complement coding is
recommended. In this mode, data values written to the analog output
channel range from F800 hex (–2,048 decimal) to 7FF hex (2,047 decimal).
If you select a unipolar range for a DAC, the straight binary coding is
recommended. In this mode, data values written to the analog output
channel range from 0 to FFF hex (4,095 decimal).
Analog Input Configuration
The SCXI-1200 has three different input modes—RSE, NRSE, and DIFF.
The single-ended input configurations provide eight channels. The DIFF
input configuration provides four channels. Table 3-39 describes these
configurations.
Table 3-39.
SCXI-1200 Analog Input Configurations
Configuration
Description
RSE
RSE configuration provides eight single-ended
inputs with the negative input of the instrumentation
amplifier referenced to analog ground (factory
setting).
NRSE
NRSE configuration provides eight single-ended
inputs with the negative input of the instrumentation
amplifier tied to AISENSE/AIGND and not
connected to ground.
DIFF
DIFF configuration provides four differential inputs
with the positive input of the instrumentation
amplifier tied to channels 0, 2, 4, or 6 and the
negative input tied to channels 1, 3, 5, or 7,
respectively, thus choosing channel pairs (0, 1),
(2, 3), (4, 5), or (6, 7).
