I want to use debounce filtering for the digital trigger on my CompactRIO device

[hiltnerj]

I have a compactRIO system that I use for cylinder pressure data acquisition in engine applications.  I trigger the start of acquisition with a TTL pulse from a shaft encoder at a fixed engine crank angle.  Sometimes I get false trigger signals from noise on the line and I am trying to apply a debounce filter to the trigger (9401 unit in slot #5 of a 9172 chassis).  when I try and use a property node to turn on the debounce filter and set the filter constant, I get an error and the triggering doesn't work.  Its not clear to me if you can use the debounce filter for this device for the start trigger.  Any ideas?

[crackerjo1]

hiltnerj,

Are you sure you mean the 9172 chassis?  If so this is a CompactDAQ chassis, not cRIO.  You might consider posting your question on the MultifunctionDAQ board,  you might get a bit more help there.

Message Edited by crackerjo1 on 05-29-2009 01:10 PM

[hiltnerj]

Thanks, you are right, I have a compactDAQ not a compactRIO (typo on my part), I'll try the other location.

hiltnerj