unable to trigger pxi-5105 off exported pxi-4461 signal

[John Lipor]

Hello,

I am running a PXI-1033 chassis with a PXI-4461 (daq) in slot 2 and 4-PXI-5105's in slots 3-6.  I want to use the 4461 to export a reference trigger signal to the 5105's, but when I try to run my program I receive the following error:

Error -89126 occurred at DAQmx Read (Analog DBL 1Chan 1Samp).vi:1

Possible reason(s):

Trigger line requested could not be reserved because it is already in use.

Property: RefTrig.OutputTerm
Property: RefTrig.Pulse.Polarity
Destination Device: PXI1Slot2

Task Name: _unnamedTask<89>

The subVI I use to export the signal is built off an example I found.  Right now it is only under the scope mode of my code (I'll take care of the datalog part later).  I'm not sure what I'm doing wrong, any help is greatly appreciated. 

Thanks,

John

[John Lipor]

I've done some more work and found that I can use my Export Trigger.vi to generate a usable trigger for one digitizer, but when I set it up using any TClk example (right now I'm using Multi-Device External Clocking (TClk)) it throws the error I described before.  Any suggestions?  Thanks.

[John_P1 · Accepted solution]

Hi John,

T-Clk will choose one of the PXI_Trig lines to use to route the Sync Pulse between devices.  Since you are configuring T-Clk before setting up the signal to be exported, the driver does not know that you intend to use PXI_Trig0 to export the Reference Trigger.  I would imagine that it is choosing PXI_Trig0 as the line to reserve for the Sync Pulse.

I recommend that you try to export the signal to one of the other PXI_Trig lines--this should hopefully fix the problem but keep us informed if it does not.  Thanks for posting and have a great weekend!

-John 

[John Lipor]

Thanks, this solved the problem!