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Chapter 2
Hardware Overview of the NI 78xxR
NI 7831R/7833R Overview
NI 784xR Overview
NI 785xR Overview
Analog Input (Multifunction R Series Only)
Input Description
Full-scale range –1 LSB
Full-scale range –2 LSB
Midscale
R Series Intelligent DAQ User Manual
The NI 7831R/7833R each have eight independent, 16-bit AI channels;
eight independent, 16-bit AO channels; 96 bidirectional DIO lines that you
can configure individually for input or output; and a Virtex-II XC2V3000
FPGA.
The NI 784xR each have eight independent, 16-bit AI channels;
eight independent, 16-bit AO channels; and 96 bidirectional DIO lines that
you can configure individually for input or output. The NI PXI-7841R has
a Virtex-5 LX30 FPGA, and the NI PXI-7842R has a Virtex-5 LX50
FPGA.
The NI 785xR each have eight independent, 16-bit AI channels;
eight independent, 16-bit AO channels; and 96 bidirectional DIO lines that
you can configure individually for input or output. The NI PXI-7851R has
a Virtex-5 LX30 FPGA, the NI PXI-7852R has a Virtex-5 LX50 FPGA,
the NI PXI-7853R has a Virtex-5 LX85 FPGA, and the NI PXI-7854R has
a Virtex-5 LX110 FPGA.
You can sample NI 783xR/784xR/785xR AI channels simultaneously or at
different rates. The input mode is software configurable, and the input
range is fixed at ±10 V. The converters return data in two's complement
format. Table 2-1 shows the ideal output code returned for a given AI
voltage.
Table 2-1. Ideal Output Code and AI Voltage Mapping
AI Voltage
9.999695
9.999390
0.000000
2-4
Output Code (Hex)
(Two's Complement)
7FFF
7FFE
0000
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