Hi,
In our
company we have a few data-loggers and are thinking of an improvement
considering data-management and reusability. Therefore we consider the DSC
(Citadel) and the TDM format.
At the
moment we are looking per hour to a binary file with a size of 133 MB. We have
32 digital and 64 analog channels. Every channel creates 500 data points per
second. Every value of the 32 digital channels (Boolean array) is converted
into an U32 value.
I have
already tested DSC and TDM. The data-management and the performance of viewing
the data is very good with Citadel. Disadvantages: When writing the digital
channels to the database every value reserves at least 1 Byte à overhead of at least 7 bits. The entire needed
storage for one hour grows about factor 3. We’ve also tried to compress a
digital array of 32 values to an U32 value. That would save storage but viewing
the data with MAX isn’t possible. Therefore we have tried to programmatically
view the data with the Mixed Signal Graph which would be a good opportunity for
us to view analog and digital data. Unfortunately the loading of the data isn’t
reasonable for our users. Furthermore we have also tried to use MAX to view
data from a remote computer. There we detected a great performance lost
compared with viewing on a local machine. Is it a know issue?
Next we’ve
investigated the TDM format. It is really a great thing (we can store the
scaling and other describing information) but a big problem for us is that we
aren’t able to search within the binary data. A further disadvantage compared
with DSC is that we have to care for the data management and that the viewing
of the data is much slower.
Has anybody
tips or details for a possible solution for our problem?
Many thanks
in advance.
Kind
Regards,
Joachim
