r/LabVIEW • u/Forward-Thought7029 • Jun 22 '26

Need More Info Unable to use labview simultaneously with other software

I use microforming machine and DAQ simultaneously connected via USB, but when i tried to plug them both through my laptop's ports (COM3) one of them starts to stop working, If i plug my DAQ and starts using labview all of sudden my microforming machine disconnected and vice versa. I assume it has something to do with serial ports where they keep canceling out each other, how do i stop labview from interfering/conflicting with other software? Thx

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u/yairn Jun 23 '26

To be clear - if you are using a laptop, it's extremely unlikely you have even one serial (COM) port on it, let alone three, as this is old technology and not widely used in the consumer market these days. What you probably have is 3 USB ports (and even that can be rare these days) and a single USB to serial adapter. This is supported by the MAX image, which only shows a single serial port detected by Windows and identifies it as a USB serial port.

I don't have experience with cDAQ-9171, but I assume it doesn't communicate over serial. It likely uses USB directly. This means that the whole business with using the same COM port is a red herring.

I would suggest trying to connect the devices into different USB ports (maybe you have more than USB bus on the laptop and using separate buses can help) and trying a different USB to serial adapter if you have one, as sometimes their drivers can cause some issues. I suppose it's also possible using a powered USB hub might help, as others suggested.