PXI ARINC 429 Module Does Not Transmit or Receive Data With Third‑Party Device

Issue Details

I have a Ballard PXI ARINC 429 module connected to a third‑party device. When I write to or read from the digital channels, no data is transmitted or received on either the PXI ARINC 429 module or the third‑party device. I am using standard LabVIEW examples, and I monitor the digital lines with an oscilloscope connected in parallel.

At the same time, the PXI ARINC 429 module works correctly when using selfTestBus = True.

Solution

Disconnect any additional instruments, such as an oscilloscope, from the digital lines between the PXI ARINC 429 module and the third‑party device.

Connecting instruments in parallel can interfere with ARINC 429 communication for the following reasons:

• A faulty input channel on the external instrument
• Incorrect grounding between the instrument and the ARINC 429 hardware
• Signal loading effects that distort digital levels

After disconnecting all parallel instruments, run the LabVIEW example again and verify whether data transmission and reception are restored.

If the issue persists, contact NI Technical Support for further troubleshooting.