Data logger
Order No. 2089 00
Page 15
5. Data logger
The Gira S1 can be used as a data logger. The data logger functionality is controlled via the "Data
logger" parameter in the "General" parameter view (see chapter 7.5 “Parameters”). If it is set to "Yes",
the data logger functionality is always activated. If a microSD card is inserted into the device or if
there is already a microSD card in the device, logging begins automatically if it is not deactivated via
the "Activate data logger" communication object.
The data logger state is sent via the "Data logger status" communication object. The data logger status
can also be queried directly. As long as the data logger is active, the communication object has the
value 1. The communication object “Data logger status” assumes the value 0 if:
• the microSD card is removed,
• no memory capacity is available on the microSD card, or
• the data logger is deactivated via the "Activate data logger" communication object.
The data logger supports two types of memory management. The microSD card memory can be used
as static or cyclic buffer.
When used as cyclic buffer, the remaining memory is monitored. When the remaining memory capac
-
ity drops below 2.5 Mbyte, the oldest log file is deleted to create space for new data.
When used as static buffer, logging is automatically ended as soon as the microSD card is full until a
new card with sufficient capacity is inserted.
Via the "Data logging format" parameter in the same parameter view, it can be configured whether
an ETS 3 (.trx) or an ETS 4/ ETS 5 (.xml) compliant data format should be used. The data logger can
be activated or deactivated via the "Activate data logger" communication object.
Naming and saving the log files on the microSD card is in accordance with the following scheme:
2010_01_06_TP1.trx (Year_Month_Day).
If there is a loss of voltage and a resulting loss of time/date, a file name can be repeated. In this case,
a tilde (~) is attached to the end of the file name, for further repetitions, consecutive numbers (~1) are
added to the tilde.
The Gira S1 supports SDHC cards up to a maximum of 32 GB. The cards must be formatted with FAT32.
Important note
To prevent damage to the card, you should deactivate logging before removing the microSD card.
Various communication objects are available for monitoring the memory status. The current card sta
-
tus and the occupancy level are queried via these communication objects. For more details, see chap
ter 7.6 “Object table”.
Important note: If the NTP server cannot be reached after a power failure, a default time is used. Fur
-
ther logging is based on this time, until the NTP server is available again.
