What does the communications watchdog in the 831-INT-ET do?
Communication Watchdog Overview
The Model 831 and 831-INT-ET have features to monitor the USB communication between the two devices and if there is no communication for one hour, the Model 831 and 831-INT-ET will automatically power cycle.
Requirements for this feature 
- 831 firmware V2.11 or later
- 831 board revision D or later
- 831 run mode = Continuous
- 831-INT-ET firmware V1.0 or later
Communication Watchdog Description 
When an 831 matching the requirements above is placed into an 831-INT-ET, the 831-INT-ET automatically sends a command to the 831 that enables the communication watchdog. When an 831 is removed from the 831-INT-ET, the communication watchdog remains enabled but becomes inactive. To disable the watchdog, go to Tools -> Communication -> Status and uncheck Communications Watchdog at the bottom.
If the communications watchdog triggers a power cycle, the system will turn completely off and in approximately 1-2 minutes turn back on. A communications watchdog event produces records in the 831 Session log that show a stop due to IO and a run approximate 1-2 minutes later.

WARNING: The 831 does not differentiate between an 831-INT and 831-INT-ET. If an 831 has been placed in an 831-INT-ET and then later removed and placed in an 831-INT, the communication watchdog must be manually disabled. Failure to do this will cause the 831 to turn off after one hour.
For additional information, see 831 Manual page 12-24.
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