# cRIO-TRF-P01

Last modified by Michael Sibayan on 2022/05/03 16:48
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Module 1 (NI-9401)

- 8 channel digital I/O set up as a pulse counter.
- Used to monitor pulses from anemometers
- Terminal block in the upper right provides power (through a resistor) to the anemometers.

Module 3 (NI-9205)

- 16/32 channel +/-10V analog input
- First 16 channels set up in +/-1V differential mode for the pyranometers and quantum sensors
- Last 16 channels set up in +/-5V referenced single ended mode for the HMP45 temp/RH sensors
- Common is tied to the 12VDC power supply negative terminal (for RSE channels)

Module 5 (NI-9213)

- 16 channel +/- 75mV differential analog input
- First four channels measure light sensor signals
- Channel 5 measures voltage of the PT100 thermistor
- Common is tied to the shields and the 12VDC power supply negative terminal (for PT100)

0.5mA current source

- Provides approximately constant 0.5mA current for the PT-100 thermistor
- 0.5mA chosen to put the signal voltage within range of the NI-9213 AI module (approximately 50mV)

Anemometer terminal block

- Provides 5VDC, through a resistor, to the anemometers
- 5V chosen to match the TTL level of the NI-9401 DIO module

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Created by Michael Sibayan on 2022/05/03 16:48

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