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Use of DIAdem IRIG106 plugin with PCM data
Chris_H1
Member
02-04-2015 02:30 PM
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I have a large Chapter 10 file (1.5GB) that I am opening with the IRIG106 plugin (version 1.1.0.5773) in DIAdem 2012. Due to the file size I am actually "registering" the file, which displays the correct channel names and attributes in the Data Portal. The channels I am interested in are a time channel and a PCM stream channel but I don't see how to proceed further. I have knowledge of how the PCM frames are arranged and such but how do I apply that information to breaking out all the individual channels in the frames (i.e. decommutating)? Do I write the PCM decom myself or is there some other (more efficient) method? Thanks!
Brad_Turpin
Trusted Enthusiast
02-05-2015 11:44 AM
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Hi Chris,
I don't have a lot of experience with Chapter10 data, but the one sample data set I see that was used to create the DataPlugin suggests to me that you could use the Calculate() command and various other sorting and extracting commands to move specific rows with matching values in the ID column(s) to a new group of just data for that ID. I have code I've created to do that for other bus data types. If you're able to send in a sample data set (perhaps not a huge one), I'd be happy to see if I can get my existing code to work with it.
Brad Turpin
DIAdem Product Support Engineer
National Instruments
02-09-2015 07:34 PM
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Hi, Brad! The PCM data appears as one of the channels in the Portal. This wiki article gives a good refresher of how the data is arranged wtihin the minor/major frames of a PCM frame (" http://en.wikipedia.org/wiki/Frame_synchronization "). I happen to know that the data words are 12-bits, which means that each data word is NOT aligned on byte boundries. If you know of a good method of lining up the frame syncs and assembling each frame to extract the words for the PCM channels, I'd love to hear it. I have to register the Chapter10 file due to the size and, so far, whenever I touch the PCM channel DIAdem feels a need to read through it, which takes longer than I have been willing to wait. I'll try to cut down a file to something more managable to see if you can do something with it. Thanks!
