Chipkin Newsletter - July 2020 Edition

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July 2020 Newsletter

BACnet COV - Change of Value

BACnet Change of Value (COV) is a mechanism that allows devices to actively report changes in object values rather than relying solely on periodic polling. By subscribing to COV notifications, a data client can receive updates whenever defined change criteria are met, ensuring that short-duration events are not missed and reducing unnecessary network traffic. COV is part of BACnet’s Alarm and Event Services and transforms devices from passive responders into active reporters of meaningful changes.

However, COV is optional and comes with limitations that integrators must understand. Not all devices or object properties support COV, subscriptions may be lost on device resets, and systems can become overwhelmed during bursts of changes. Additionally, offline subscribers may miss notifications, and vendors are not required to queue or resend them. As a result, COV is most effective when combined with periodic polling and careful system design rather than being relied on as a guaranteed delivery mechanism.

Power Line Communication

Power Line Communications allows the user to control and monitor all the connected devices to the power line since it is implemented in the same wiring system. PLC incorporates a Rectifier with a Filter thus sending a less fluctuating signal. It uses a Microcontroller and a relay switch for the transmission of data which is more accurate and stable with good output signals. Click to read the full article.