Issue
Communication issues with the UNC when ASD devices in the station are not physically connected to the ASD bus.
Environment
- UNC and ASD controllers
Cause
Avoid a known cause of communications problems between a UNC and the ASD controllers by disabling polled controllers that are not physically connected to the ASD bus.
Resolution
The polling is enabled / disabled by a check box on the Config tab of the ASD controller.
With polling disabled, the poll scheduler will skip that device, resulting in more efficient communications with controllers that are actually online.
This issue has been seen on jobs where the ASD network has been engineered offline, with a large number of controllers with polling enabled, but the actual device not yet physically connected to the ASD bus.