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6.7 Data memory
The viasis measurement data store is organized as a ring storage, so in case the memory is full
the oldest stored data are overwritten by the newest data. Herewith is guaranteed that the
viasis still keeps the most actual data in case of a data overflow, respectively a too sporadic
measurement data download and deletion.
The viasis is either delivered with 2, 4 or 8 megabyte non volatile flash memory. The herein
stored data have a retention of 20 years minimum according the manufacturer and the memory
cells can be rewritten 100000 times (write/erase cycles), what means a total of 100000 meas-
urements and parameter changes can be done, before statistically a memory failure should
occur.
The measured speed data stored as data blocks with 10 byte length in the memory. Therefore
the storage capacity (minus some bytes for parameter and log protocol) is depending on the
storage size of 2, 4 or 8 MB finally 212160, 425125 or 842952 measurement data blocks. This
is equivalent at a radar range of 120 meter and an average vehicle speed of 50 km/h about
36833, 73806 or 146345 vehicles.
The measurement data store should be deleted after a data download in order to keep the
amount of read data and the data transfer times small.
6.7.1 Read measurement data
For the download of stored measurement data of the
viasis you can use the program
viagraph
delivered on
CDROM, see chapter 6.1.3 or the
ViaApp
for
Android Smartphones, see chapter 6.1.1.
In order to start the data download with viagraph the
data connection to the viasis must have been established successfully, see also illustration 11.
Click on the button „
Read data
“ and the data transfer progress appears, but maybe just for a
glimpse depending on the number of data, see illustration 48
.
Next the dialogue to save the
data in a file appears, see il-
lustration 49.
You may change or extend
the proposed file name. In
order to keep a good over-
view over numerous data files
you may e. g. add the meas-
urement location to serial
number and download date
already given in the filename.
With a click on the “
Save
”
button store the data to your
computer’s hard disk drive.
Illustration 48
Illustration 49: Save data file
