Campbell CR3000 Micrologger, Руководство оператора

Страница: 445 / 644

Section 8. Operation
445
CR3000 SRAM Memory
Use Comments
——————————
——
Communication Memory 1
Construction and temporary storage of PakBus packets.
——————————
——
Communication Memory 2
Constructed Routing Table: list of known nodes and routes to nodes.
Routers use more space than leaf nodes because routes to neighbors must
be remembered. Increasing the PakBusNodes field in the Status table will
increase this allocation.
——————————
——
USR: drive
≤ 3.6 MB (4 MB Mem)
≤ 1.5 MB (2 MB Mem)
Optionally allocated. Holds image files. Holds a copy of final-storage
memory when TableFile()
(p. 218)
instruction used. Provides memory for
FileRead() and FileWrite() operations. Managed in File Control
(p. 456).
Status reported in Status table fields USRDriveSize
(p. 592)
and
USRDriveFree
(p. 592).
CR3000 Memory Drives
Drive Recommended File Types
CPU:
1
cr3, .CAL
USR:
1
cr3, .CAL, images
USB: .DAT
CRD:
2
Principal use is to expand final-
storage memory
(p. 539),
but it is also
used to store .JPG, cr3, and .DAT
files.
1
The CPU: and USR: drives use the FAT32 file system. There is no limit,
beyond practicality and available memory, to the number of files that can be
stored. While a FAT file system is subject to fragmentation, performance
degradation is not likely to be noticed since the drive has a relatively small
amount of solid state RAM and so is accessed very quickly.
2
The CRD: drive is a CompactFlash card attached to the CR3000 by use of a
CF card storage module
(p. 613).
Cards should be formatted as FAT32 for
optimal performance.
8.8.1.1 Memory Drives — On-Board
Data-storage drives are listed in table CR3000 Memory Drives
(p. 445).
Data-table
SRAM and the CPU: drive are automatically partitioned for use in the CR3000.
The USR: drive can be partitioned as needed. The USB: drive is automatically
partitioned when a Campbell Scientific mass-storage device
(p. 613)
is connected.
The CRD: drive is automatically partitioned when a memory card is installed.