Chapter 3 Configuring Your SCXI Hardware and Software
Getting Started with SCXI 3-52 www.ni.com
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 –5Vto
+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).
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