Solution
The NI-9237 simultaneous bride module for use with CompactDAQ and CompactRIO contains all the signal conditioning required to power and measure up to four bridge-based sensors simultaneously.
You can follow the connection diagram below if you are using NI-9949 with NI-9237 to measure 3-wire strain gauge.
External resistor (R3) is required to complete the bridge circuit like the picture below.
The list of pin connections between NI-9949 and the NI-9237 can be found below: