Xeos Alert Geomatics Resolute, Руководство пользователя

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Resolute User Manual Version 2.5 29
Recording Binary Data
The Resolute can record binary data from other sensors. Contact Alert Geomatics for more
details.
SD Memory Management
The data produced by the Resolute is written to two microSD cards. As the data generated by
the Resolute fills the card, files will automatically be deleted by a memory management task.
The task measures the size of the files on the SD cards. If an SD card is over 90 % full, the task
deletes the oldest dated files until the SD card is less than 80 % full. This continues in
perpetuity. This task is enabled by default, but can be enabled disabled with
$SdSetMemoryManagement [T/F]. For instance to completely disable the setting send the
command:
$SdSetMemoryManagement F
If Memory Management is disabled and the memory cards are full, no new data will be written
to the SD Cards. If the task is enabled, the task can be assigned specific cards to operate on, on
a per card basis. This is configurable with the $MemoryManagementSetDisks [1/2/3]
command where 1 corresponds to only operating on SD 1, 2 corresponds to only operating on
SD 2 and 3 (the default setting) corresponds to operating on both SD cards. For example to only
manage the memory on SD 2, and keep SD 1 data indefinitely the following command would be
sent.
Before firmware 6272, the memory management task could be enabled or disabled
with $SDSetdeleteoldest [T/F]. This command does not exists in 6272 or later.
The lifespan of the files on the card before they are deleted depends heavily on the settings of
the unit. If only a small amount of GNSS data is being recorded, for instance 1 Hz PVT/PNT data,
the files will be present for months. If raw GNSS data is being recorded at 5 Hz, the data may be
present for merely weeks.
While it is not necessary for operation, it is possible to re-format the SD cards. This can be done
using the “$formatSD [identifier] [filesystem]” command, where the identifier is either “1” for
card 1, or “2” for card 2. Filesystem is either “1” for Fat32 or “2” for exFat. exFat must be used
for card sizes over 32GB. To format card 1 as Fat32, the following command would be issued:
$formatSD 1 1
If operating the Resolute off of a low voltage disconnect (LVD), the power interruptions can result
in the corruption of the SD cards. To protect the cards, the Resolute can be configured to
unmount at a set voltage, before the low voltage disconnect cuts power to the device. The unit
can be configured to remount the cards at a higher voltage. The feature must first be enabled
with the “$setshutdownvoltageenabled t”. The lower shutdown voltage must be set with the
“setshutdownvoltage [voltage]” command. The default shutdown voltage is 11.5 V and should