Campbell Scientific CM6/CM10 Tripod Weather Station Installation - Manual (Page 66)

Section 6. Maintenance and Troubleshooting
6-4
B. Use a voltmeter to measure the voltage on the 12 V and G terminals; the
voltage must be between 9.6 and 16 Vdc.
C. Make sure the datalogger is connected to the modem, and the modem is
properly configured and cabled.
At the computer:
D. Make sure the Station File is configured correctly.
E. Check the cable(s) between the serial port and the modem. If cables have
not been purchased through Campbell Scientific, check for the following
configuration using an ohm meter:
25-pin serial port:
computer end modem end
2 2
3 3
7 7
20 20
9-pin serial port:
computer end modem end
2 3
3 2
4 20
5 7
F. Make sure the modem is properly configured and cabled.
G. If still no response, call Campbell Scientific.
6.2.3 NaN Displayed in a Variable
A. Make sure the battery voltage is between 9.6 and 16 VDC.
B. Verify the sensor is wired to the analog channel specified in the
measurement instruction or Short Cut .FSL file
C. Make sure the Range parameter in the measurement instruction covers the
full scale voltage output by the sensor.
6.2.4 Unreasonable Results Displayed in a Variable
A. Inspect the sensor for damage and/or contamination.
B. Make sure the sensor is properly wired to the datalogger.
C. Check the multiplier and offset parameters in the measurement instruction.