Hello Forum,
We recently visited a long term station on our quarterly visit and found No Program on the CPU and no data on the logger. We collected values during the previous check, but something between then and the subsequent visit removed the program from the CPU and thus no values were collected.
We are brainstorming why this may have happened and things to check on our next visit.
Has anyone experienced this before who could offer some guidance?
Things we suspect may cause this symptom:
* The CR1000 onboard battery is flat leads to a loss of program on the datalogger if:
* There is a loose connection somewhere on the power supply circuit
* There was a momentary power drop on a battery swap after downloading data during the last visit
Anything else?
If the Lithium battery is really low, it can cause memory corruption even with a constant 12VDC source connected. It is recommended to replace the Lithium battery when it reaches 2.5 volts.
I recall that the save and send dialogue in older versions of the CRBasic editor in LoggerNet had the bad habit of not enabling the "run on power up option" by default. This caught many an unwary victim by surprise because the program appeared to be working after it was sent but the program failed to survive a power down or logger reboot. This may have been what happened in your case. I believe that this issue was fixed in LoggerNet 4.3.