Queue size for XNET Write Signal Waveform

Hello,
I'm trying to use XNET librairy to play a predefined waveform on an output signal. I'm working with LabVIEW 2014 SP1, XNET 14.5 on a W7 Pro 32 bits operating system. I use a NI PCI-8512 card. It's my first application using xnet library.
In my test application, I give to user the possibility to define the waveform to play. The total time and the sample frequency are settable. The output CAN signal is cyclic, with a cycle time of 0.01s (10Hz). I chose to use same frequency for sample my waveform and the CAN writing.
I've difficulties to work with the queue size. In this example, that's good but I don't really why. I've tested different values of Queue size and 100000 seems to be good until 60sec. But for longer times (about 5 minutes), this method is not good...
What is the good way to work in this mode, and how to use efficiently the queue size property? The information and the example in the NI-XNET Hardware and Software Help are not very probant...
Thanks per advance!
Francis M | Voir mon profil
Certified LabVIEW Developer
Solved!
Go to Solution.

Sounds like you have the concept. I've never done this with signals, only frames, but I assume there is a queued option. You'll want to read the help, or just try it and see if it works. Attached is an example that does not run which demonstrates something similar to what I've done in the past. Basically fill the buffer, wait a little, then add more frames to fill it again. Repeat until there are no more frames to add to the buffer.
Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.
Attachments:
XNET Queued Buffer Example.vi ‏12 KB

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CAN Signal Input XY.vi ‏94 KB

I'm sad and disappointed because one week after my post and support request to NI (Reference#9023-GRQ 747) no one answered or contacted me.
After many tests I could reproduce the problem and the final conclusion is that "XNET Read (Signal Waveform).vi" doesn't work properly inside a timed loop. If you reproduce always the same data from one CAN port and read that data from another CAN port the read values are wrong and different every time. So data is not well resampled or whatever... is this a bug?
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You need to connect them properly one to each other and power them.
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Unfortunately I use timed loops in my application so it is a BIG problem !!!
See below picture of a bad readings, Brake_lights and Brake_pedal_SW signals should be equal and are different.
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XNET Bad Resample.zip ‏390 KB

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1.-
2.c
3.a
4.a
5.c
6.b
7.a
8.d
9.b
10.a -
11.a
12.c
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14.d
15.c
16.a -
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18.d
19.c
20.a
21. -
22.d
23.b
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Click the Hardware tab, select the drive (array) you'd like to set advanced caching on, and click the [Properties] button.
Click the Policies tab, and note the setting of the [ ] Turn off Windows write-cache buffer flushing on the device. This may not be available, depending on the drivers.
Note, specifically, that this feature can cause quite a lot of disk data to end up in your RAM for a while, if an application gets significantly ahead of the drive's ability to write data. This is where the warning about having good battery backup comes in. I'll add my own comment: Your system should be very stable as well. You don't want it crashing when a lot of writes are pending.
-Noel

Queue size for XNET Write Signal Waveform

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