Symptom
A panel is online, but it is not polling any events. It is possible that the COM port is deadlocked.
Resolution
To resolve this issue:
- Stop the Communication Server.
- Add the following settings to the ACS.INI under the [CommunicationServer] section:
MonitorComPortThreads=1DeadlockDetectionThreshold=120
- Restart the Comm Server.
The DeadlockDetectionThreshold value above indicates the amount of time (in seconds) that must elapse without receiving an update from a Com Port Thread before the COM port is declared to be deadlocked.
If the COM port is deadlocked, the following alarms may appear:
- Communication Thread Blocked: When communication to the panel is blocked and no events are reported to Alarm Monitoring or logged in the database.
- Communication Thread Active: When normal communication resumes.
Right-click on the alarms for additional information about the failure.
Applies To
OnGuard (All versions)
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