These are memory banks for internal power supply data (DT49), extended device identification data (DT50), diagnostics and maintenance data (DT52).
This setting controls how fresh the data must be before the system decides to re-query the DALI device. If the cached data exceeds the defined age threshold, the Casambi CBU-DCS gateway will automatically refresh the data by polling the DALI device again.
This is particularly useful for:
- Ensuring up-to-date diagnostics in building management systems (BMS)
- Reducing unnecessary DALI traffic by avoiding overly frequent polling
- Balancing performance and accuracy in large-scale installations
For example, if the maximum data age is set to 60 minutes, the gateway will only re-query the DALI device if the last data read is older than 60 minutes. This helps maintain reliable monitoring without overloading the DALI bus.
Hint: The data retrieved from memory banks MB201 (DT49), MB1 (DT50), and MB202–207 (DT52) is mostly static and changes infrequently. Because of this, there’s no practical need to read these memory banks more than once per hour — in fact, once per day is usually sufficient.
To reflect this, the update interval setting uses 15-minute steps, and you can specify a maximum interval of 63 hours by setting the value to 252 (252 × 15 minutes).