Data Acquisition in DT9816-S using LabView

[Subhadeep Basu]

Hello All,

I am facing some problems while capturing real time data with DT 9816-S DAQ (Measurement Computing DAQ) using LabVIEW. I want triggered data collection (1 channel) with the mentioned DAQ (DT 9816-S) using LabVIEW. I have installed some additional libraries (LV Link 3.0) for this purpose. 

Using those VIs, I have constructed the block diagram. This is as follows:

Fig 1 : Block Diagram

But, while running It shows "invalid trigger".  I have used 'Digital Trigger' in this case. However, I have also changed the trigger to 'Analog' but the issue still persists. 

 

Any help regarding this will highly be appreciated.

 

Thanks and regards,

Subhadeep Basu

[Fausto]

Hello @Subhadeep Basu.

Data Translation's interface for LabVIEW is LV-Link. 

https://mcc.download.ni.com/#downloads/DTSoftware/LVLink/

The target Windows system must have LabVIEW before installing LV-Link.  The files are copied to the target system's LabVIEW directory, i.e. 'C:\Program Files\National Instruments\LabVIEW 2022\user.lib\LV-Link3\Examples'.

 

I modified the existing 'DtAinTrig.vi' example for a falling (negative) external digital TTL trigger.

 

 

As listed in the DT9816 user's manual, the DT9816 series supports a software trigger and a negative external TTL trigger, which should be connected to the 'Ext Trigger' pin on the module.

https://www.mccdaq.com/PDFs/Manuals/UM9816.pdf

I have attached the .vi example.

Regards,

Fausto

 

DtAinTrig_fs1.vi

[Subhadeep Basu]

@FaustoMany thanks for your help.

I have a query. If I want automatic data acquisition (without using/clicking 'Stop' button) then what should I do ? Should I avoid the loop or should I remove the 'Stop' button (in Block Diagram fig).

Thanks and regards,

Subhadeep

[Fausto]

@Subhadeep Basu If you remove the loop and STOP button, then the VI captures the number of samples per channel (shown on the Front Panel) and then ends.

[Subhadeep Basu]

Many thanks for your reply.

[Subhadeep Basu]

@Fausto, I was trying to capture simultaneous data in 2 channels simultaneously. The block diagram is shown  as follows:

But, here I am facing some errors. it says "Drivers can't be initialized" (Screenshot is attached).

Can you suggest how to overcome this problem.

 

Thanks and regards,

Subhadeep