The dust monitor at end X has stopped communicating. From trending back it appears to have stopped sometime around Jan. 31 2014 17:46 - 17:55 UTC (9:46 - 9:55 PST).

It is odd. The dust monitor itself acts as though it is receiving commands (the front panel goes into remote mode), but the software times out waiting for a response. I checked the front panel settings, the cabling, turned the dust monitor on and off, restarted the IOC and power cycled the Serial to Ethernet converter, all to no avail.