12
Fig. 9.6.1. High, low, or outside of the band alarm Fig. 9.6.2. Alarm within the band
10. USE AND FUNCTIONS OF THE SD/MMC CARD
Use of an SD/MMC card may be particularly suitable to transfer data in the event of stationary (wall) installation of
the recorder and when the size of the internal memory is not sufficient to record the required number of
measurements.
A card that is properly installed in the “
SD/MMC CARD
” slot has the following functions:
−
storage of files with saved data in the course of recording
−
off-line configuration of the parameters of the device (from the
AR234.cfg
configuration file after the “
COPY
”
button has been pressed, see chapter 9)
−
transfer of “
csv
” archive files from the internal memory onto the card (this is done after the “
COPY
” button has
been pressed and the authorization has been successful or when the authorization demand is switched off;
during the operation, the “
STATUS
” LED is illuminated; the time is up to 2 min. for 4 MB of data).
NOTE:
!
−
transfer of “
csv
” files from the internal memory onto an SD/MMC card takes place
SIMULTANEOUSLY
with
off-line configuration; consequently, an appropriate “
cfg
” file must be present (or absent when parameter
15:
Prot
=
off
) so as to avoid undesirable reconfiguration of the recorder
−
in order to extend the operation of the battery, it is recommended to use SD/MMC cards of reputable brands
(e.g. SanDisk, Kingston, or GoodRam) formatted in the FAT16 file system
−
in the case of cards larger than 2 GB there is a risk that the device may lag, which requires taking out
the battery for a short time
11. VIEWING RECORDED MEASUREMENTS AND EVENTS
In order to archive data, the recorder creates a text file with the "csv" extension in the
internal memory or on an
SD/MMC card. The file name contains the device type (AR234), the identification number 16:
ID
, and the date and
time of creation of the file, e.g. „AR234_1_2009-11-30_10-57-16.csv”. The format of a single data record is the
following: “sequential number of the event;date;time;identifier of the event;measurement;internal
temperature;checksum”, an example record for measurement in the AR234: “30;2009-11-
09;16:34:58;5;149,5;26,2;8BE2”, where the measurement =149,5 and the internal temperature=26,2 °C. The types
and the identifiers of the recorded events are:
−
measurement (identifier of event
5
)
−
connection to the USB port (
0
, “USB;CONNECTED”)
