Pre-start data collection

LogTag^® products support a feature called pre-start logging, which can be selected during configuration.

When pre-start logging is enabled, the LogTag^® will automatically start recording as soon as configuration is completed. It will record at the same sampling interval as defined in the configuration and will continue to record until the user starts the LogTag^® by pressing the START/MARK button. Once the LogTag^® has been started, it will record started readings as per the configuration settings. While the LogTag^® is recording pre-start readings the Alert LED will not activate, even if an alert condition is present.

Pre-start logging is useful as a fail-safe recording setting so if the LogTag^® is not started at the appropriate time, the readings will still be available to view later.

When the readings are retrieved from the LogTag^®, any pre-start readings will be separately displayed, so the user can quickly identify the readings recorded before and after the LogTag^® was started.

All LogTag^®s have a finite amount of memory to store the readings they records. Therefore, while the LogTag^® is recording pre-start readings the LogTag^® will operate in its 'continuous operation' mode, which is explained further in the section Continuous operation. Once the memory within the LogTag^® is full, the oldest pre-start reading will be overwritten with the latest pre-start reading, or the latest started reading if the logger has been started.

Once started, the logger will first fill any remaining memory, then overwrite the oldest pre-start readings until the complete memory is filled with started readings.

If a LogTag^® has been configured to start recording at a certain date/time, or for push button start from hibernation, no pre-start readings will be recorded.