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National Instruments Corp.
5
NI 9201E/9221E
The NI 9201E/9221E with screw terminal has a 10-terminal,
detachable screw-terminal connector. The NI 9201E/9221E with
DSUB has a 25-pin DSUB connector. Each channel has an AI
terminal or pin to which you can connect a voltage signal. COM,
the common terminal or pin, is internally connected to the isolated
ground reference of the module.
The NI 9201E/9221E channels are isolated from other modules in
the system. The module protects each channel from overvoltages.
Refer to the
section for more information about
overvoltage protection. The input signals are scanned, buffered,
conditioned, and then sampled by a single 12-bit ADC. Refer to
Figure 3 for an illustration of the input circuitry on the
NI 9201E/9221E.
Figure 3.
Input Circuitry on the NI 9201E/9221E
NI 9201E/9221E
Buffer
Isolated
ADC
Overvoltage
Protection
Mux
COM
AI7
AI0
