Application Note On Monitor Formats; Internally Logging Data - AML Oceanographic AML-6 RT User Manual

Application note on monitor formats

While columns of data are easy to read by humans, in instances where the streaming data will
be interpreted by machines (ie. other logging devices, software, telemetry modules, etc), users
are strongly encouraged to utilize AML's extensible format, referred to as AMLx. Refer to
Appendix B for more information.

Internally Logging Data

Data logging is distinct from monitoring; the two operations may happen independently from
each other. An instrument may log data without monitoring, monitor without logging, or do both
simultaneously. In all cases, data logging is indicated by symmetric on/off flashing by the
indicator LED.
Data logging can commence in multiple ways:
1. By default, the instrument is configured to immediately begin logging data when it
detects water immersion. Immersion detection is triggered when measurements from
an installed conductivity or sound velocity sensor exceeds a lower threshold (typically
close to 0). For example, the default behaviour is for a powered instrument to begin
logging data immediately upon immersion in water regardless of command line state
(monitoring or not). The indicator light will flash green.
2. Alternatively, logging can be controlled manually by entering the command
>SET LOGMODE MANUAL
And sending the command
>LOGON
Logging invoked in this method may be ceased by sending the command
>LOGOFF
In this instance, logging will commence independent of in-water status.
3. Logging can be linked to monitor mode - ie, logging occurs whenever monitor mode is
engaged. To link logging to monitor, issue the command
>SET MONITOR LOG YES
The instrument will commence logging whenever a monitor command is issued.
While the output format of monitor mode is configurable, log file format is fixed; however, data
between the two is generally identical. For example, sensor measurement and derived
parameters that are visible in a monitor sentence will also be included in the log file. Logging
and monitoring will also use identical sample rates.
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