Table 1. Signal Descriptions
Signal
Description
COM
Common reference connection to isolated ground
EX+
Positive sensor excitation connection
NC
No connection
RTD+
Positive resistance temperature detector connection
RTD-
Negative resistance temperature detector connection
Connecting 3-Wire and 4-Wire RTDs
You can connect any combination of 3-wire or 4-wire RTDs to
the NI 9216. Each NI 9216 channel contains circuitry that
automatically detects the type of RTD connected to the channel.
The NI 9216 scans all eight input channels and automatically
configures each channel for the appropriate mode. In 4-wire
mode, the EX terminal is a 1 mA current source. In 3-wire mode,
the RTD+ terminal is a 1 mA current source. The NI 9216
NI 9216 Getting Started Guide
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© National Instruments
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