Casella CEL Nomad portable weather station - Manual (Page 55)

side of the unit directly above the primary RS 232 9-way D-Type port as shown
in Figure 2 (Chapter 2).
The unit has been designed to recognise CompactFlash ATA cards and
treat them as IDE hard disk drives, thereby simplifying the process of data
transfer to PCs. The same card can be connected to a suitably equipped PC and
the files transferred without the need for specialist software.
The current technical specification for suitable CompactFlashTM cards
is outlined below.
Operating voltage 3.3 V DC
Temperature range -20 to +70
o
C
Physical size CompactFlash CF Type 1
Capacity 4 MB to 256 MB
Note: capacity is limited by file system, only
FAT12 and FAT16 are supported.
A card can hold data from only one logger at any time, irrespective of
the capacity of the card or the amount of data it holds. When a logger
writes data to the card, it also writes an electronic signature uniquely
identifying this logger. From then on (or until the card is erased) the
card can be used only with this particular logger.
The electronic signature also identifies the logger configuration
used to create any data on the card. If the configuration has changed
since the card was last used, then the signature will not be accepted as
this could result in a misinterpretation of the stored data later on. This
ensures the integrity of the data until off-loaded to a PC.
Before use, all cards must be formatted on a suitable PC.
The logger automatically checks the type of card, signature and
configuration every time a new card is inserted. The correct orientation for
inserting the card is shown in Figure 2 (Chapter 2).
Having accepted the card as suitable for data storage, the logger
transfers any stored data to the card. In addition while the card remains
inserted all new data will be logged to the card, rather than stored internally.
The card can be removed any time the logger is not actively writing
new data to it. During these periods, the LCD shows a card busy message and
the card should not be removed.
Once removed, the card can be inserted into a suitably equipped PC
and the data and control files copied in exactly the same way as any other disk
drive.
Sensus Data Logger
Page 55 of 68
NOMAD Portable Weather Station
Users Handbook