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Best way for data acquisition form UniStream to PC on win10


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I consider few ways to get 100 variables every second from USC-B10-TR22:

1.  Create DataTable on SD card, and then get it through FTP server

2. Get data via MODBUS

3. Use any OPC client

When I tested first way, there was problems with accurate timming.
I forced creating line in SD file with data every 0.8s, and average time
was around 0.8s, but varied between 0.6 and 1.4s

Second way seems to be ok, but using Python's modbus library also occured some 
timming mismatch. Average was also ok, but again varied between similiar values. 
I'm not sure, but it also can be Python's library problem, because it is me 
first time with this library. 

So far I don't have any experience with OPC and I would like to know is it right 
way or not.

I also tried DataSampler, but it is limited by amount of variables saved with 
one DataSampler, so I discontinued this way. 

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