Trigger DMM-4080 with DAQ-6723 using PXI-chassis backplane

Hello,

My question is simple : How can I trigger a ni-DMM 4080 with a ni-DAQ 6723 using the TTL line in a PXI- chassis backplane ?

Currently I was triggering the ni-DMM 4070 using the external trigger in front side of the DMM card be sending a digital signal from the DAQ;

Yet, now NI removed this connector on their new DMM (PXIe-4080 like) and I have to use the TTL line in the chassis backplane to trigger them. Yet, despite numerous attempts, I can't see how to do it.

Indeed, the only answers I found was to use the Matlab command "addtrigger" which required an "Analog Input" subsysteme in the DAQ but my model 6723 has not such a feature.

Thank you very much,

Damien

Answer 1

[Pratyush]

Hi Damien,

Triggering a NI PXIe-4080 DMM with a NI PXI-6723 DAQ card via the PXI chassis backplane is not straightforward due to the 6723's analog output nature and lack of direct digital triggering capabilities. The essential steps involve:

• Determine which backplane trigger lines in the PXI chassis can be used for communication between modules.
• Attempt to output a voltage change as a trigger event, though this is outside the typical use case for an analog output device like the 6723, which doesn't natively support digital triggering or direct routing of signals to backplane trigger lines.
• Manually routing the signal from the PXI-6723 to a backplane trigger line is necessary but not directly supported through software for the 6723 due to its analog output design.
• Set up the DMM to wait for a trigger on the specified backplane line.

Directly triggering a PXIe-4080 with a PXI-6723 via TTL backplane lines is not feasible in the desired manner. Consider using a different module that supports digital outputs and can interface directly with the PXI backplane trigger lines for more straightforward implementation.