About updating point status

For real-time building automation management, alarm conditions and portal events must be reported on promptly. The Mercury driver updates proxy point values either by polling the points (this method requires significant overhead) or by asynchronous notification.

There are two ways to update the status of Mercury points in the NiagaraAX station:

The default is point polling, which requires overhead and slows system efficiency.
The controller polls each discovered point regularly. Polling frequency defaults to once per second. Although it can be changed, more frequent polling is recommended to keep statuses current in real time. This type of update uses the HTTPS connection and port 443. This connection is also used for device ping (configured on the MercuryNetwork property sheet).
The alternative is asynchronous notification, which requires less overhead, improving system efficiency.
The JACE “listens” on a separate connection for asynchronous event notification. When an event occurs in a Mercury panel input, output or portal, a notification is sent to the JACE asynchronously. This notification updates the corresponding point status in the points folder. This type of update uses a TCP socket connection and port 4001.

About updating point status

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