Can't trigger off of signal

[jeff_scharpf]

I'm using the latest Signal Express with an NI-9233 and an ICP force sensor. When I set up my hardware to measure the first channel, it reads it just fine, but when I try to set up the trigger, the option to use the signal as a trigger is greyed out. The only options available are NONE and SOFTWARE.

Is there something else I need to do so I can trigger off of my input signal?

Thanks.

[Christophe R]

Hi,

This module doesn't have analog triggering capabilities, but SignalExpress has a software trigger step that you should be able to use to trigger the signal. This step is located in the Execution Control palette. It requires the input signal to be continuous, so make the acquisition mode of the DAQmx step is set to "continuous".

I hope it helps.

Christophe 

[BrowningG]

Hello Jeff,

To add to Christophe’s comments, it is also possible to perform hardware triggering on your 9233.  This can be done if you have a cDAQ-9172 NI CompactDAQ Chassis and another cDAQ module that uses the type of triggering you would like to use.  An example of such a module would be an NI-9205.  With this module installed, you can trigger off of an analog input or a digital input.  This trigger event can then be shared over the cDAQ chassis backplane. 

For analog input triggering, it is necessary to have an analog input channel from the NI-9205 as the first channel in the scanned channels list in SignalExpress.  An analog input trigger channel can then be specified as the channel from the NI-9205.  Please see the following screenshot. 

After the 9205 is installed in any slot in the cDAQ-9172, you can use the PFI0 line from this module as a digital trigger for your analog input task.  Please see the following screenshot. 

Message Edited by BrowningG on 11-30-2007 04:48 PM