How to set trigger (analog input) ? (Session based interface)

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Deroissart
Deroissart 2014-7-8
评论： Nidhi Jain 2014-7-15
Hi everyone
I would like to add a trigger using an analog input as a reference channel. I'm using the session based interface and a NI PXIe device.
How can I make it? I've already read the example but it's for an external trigger using a switch.
Thank you for your answers.
GD

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回答（1 个）

Nidhi Jain
Nidhi Jain 2014-7-15
Hi,
Have you tried doing:
>>s=daq.createSession('ni');
>>addAnalogInputChannel(s,'PXI1Slot2','ai0','RTD');
>>addAnalogInputChannel(s,'PXI1Slot3','ai1','RTD');
>>tc=addTriggerConnection(s,'PXI1Slot2/PXI_Trig1','PXI1Slot3/PXI_Trig0','StartTrigger');
As long as you have mentioned the source and destination correctly, the trigger does not need to be external. You can refer the doc for more information:
http://www.mathworks.com/help/releases/R2014a/daq/ref/addtriggerconnection.html#bt_7mbb-1
  2 个评论
Deroissart
Deroissart 2014-7-15
Hi,
Does this code work when you're using one Slot on your PXI device?
Because I'm using a PXIe device with only one card on the PXISlot2.
And is the PXI_Trig1 an analog source? In the datasheet of my NI Card(NI 4499), it's mentionned that PXI_trig1 is a digital source for the trigger.
Thank you for your answer.
GD
Nidhi Jain
Nidhi Jain 2014-7-15
Hi,
When adding the trigger, the source and destination cannot be the same device so I think it won’t work if the same slot is mentioned for both source and destination.
The triggers PXi_Trig1 and PXI_Trig0 are digital triggers because the device I am using NI PXIe-4357 does not support analog triggers.
It looks like your device also supports only digital triggers so I think you won’t be able to add an analog trigger.

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