Generating TTL signal to control external devices

[Dongsu]

Hi All,

I have created a LabVIEW code to send out TTL signals to injector, spark plug and high speed camera for my optical GDI engine to conduct my ph.d project.

However, somehow although I can observe the signal from the LabVIEW itself, I cannot see the signal from my oscilloscope (Please ignore the pressure profile signal). For your information, when I vary my inputs, the code responds accordingly i.e. timing, duration, etc. of my TTL signal changes as I command.

 

 

By using NI MAX, I can confirm that there is no issues regarding the connection.

I am using a LabVIEW 2018 version along with cDAQ-9178 module, and NI-9401 card is utilized for Digital I/O.

Could you please help me to sort this issue?

Many Thanks,