Set up connection VI start and stop without losing or deleting data

Hello

I currently use a PCI-6280 M-series and a card PCI-6601 of counter measurements on Labview 2010.

I have 3 tasks implemented, 2 tasks of linear encoder on the 6601 counter and 1 analog input task with 4 inputs x on my 6280.  All of these are timed with a counter on the 6601 through a RTSI line.

All of these tasks, I have a similar setup as the picture in http://zone.ni.com/devzone/cda/tut/p/id/9574 except that they are all set up as only "Log" and "create/replace" for the logging.vi configuration file.

Because I want to have the encoders permanently locate my position, I never "stop" the tasks of meter.  However, I need to use the data acquired after each trip along the way to get and process location and subsequent analogue input data points I have.  What I did, I would be 'stop.vi' my clock on the counter sample, and then open the PDM file, read the file PDM, get the table from there, close the PDM file, then "run.vi" the clock on the counter sample.  However, I found when I stop the sample clock, not ALL data points have been listened to in the file.

For example, say I move my cart to 100mm to the right during recording, then stop the sample clock, get the PDM file table, find the size of this table called 'X' for future use.  Then I get the ramasseherbe on the origin WITHOUT restarting the clock.  THEN I start the sample clock and move from 100mm to the left.  After that, I once again, stop the sample clock and get data from my file tdms starting at the offset of reading on "X + 1".  I EXPECT that this table SHOULD start at 0 then go to the 100 mm to the left.  However, what it does, is that I see the data begin at 100mm from the right for a few data points, then GOES to 0, then moves to the left as planned.

I propose this means that when I stop the sample clock, data from meters (stamp?) not all were listened to the tdms file yet, and when I start the clock, the rest becomes she dumped.  Here, I'm confused because I thought that 'configure logging.vi' stream directly in the file without a buffer.

I was wondering if I'm doing something wrong, wait bad things, and if there is a way to apply what I want.  As in, is there a way to dump data remaning in the "buffer" (I tried the tdms vi flower, but that didn't work and I didn't think it was relevant) after I stop the clock or something like that, or is my implementation to offshore competely.

Thanks for reading,

Lester

PS. have a way to read the most recent point counters would be great also.  However, whenever I put the offset or relative to the most recent, it is said that I can't do during indexing, even if I saw a community post saying that it works with analog inputs.  This is perhaps off topic, but yes, now I'm just trying to get the tables of PDM works, thank YOU!


Tags: NI Software

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