Technical data

Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs 4
4000 X-Series Oscilloscopes Advanced Training Guide 139
Lab #23: Decoding, Triggering, and Searching on ARINC 429 Signals
In this lab you will learn how to set up the scope to decode and trigger on
ARINC 429 traffic. In addition, you will learn how to use the scope's
automatic Search & Navigation capability, as well as use Segmented
Memory acquisition to capture multiple and consecutive occurrences of a
particular operation. This lab does not provide a tutorial on the
ARINC 429 protocol. Also, the ARINC 429 signal provided is not a complex
representation of true ARINC 429 traffic; our training signal will consist of
five words, using low- speed (12.5kbps) for simplicity. To complete this lab,
your scope must be licensed with the MIL- STD 1553 & ARINC 429 serial
triggering & analysis option (Option AER). You can verify the installed
options on your oscilloscope at [Help] > About Oscilloscope.
1 Connect the channel-1 probe to the Demo 1 terminal and ground.
2 Press [Default Setup] on the scope's front panel.
3 Press [Help]; then tap the Training Signals softkey.
4 Select and enable the ARINC 429 signal.
5 Change channel- 1 to 1.00 V/div.
6 Change the timebase to 100 µs/div.
You should now see what appears to be an untriggered display, as seen in
Figure 94. This is because the scope is triggering on random rising edges,
but the signal we are trying to view is too complex for this trigger type.
Our next steps will be to setup and enable serial decoding of the signal,
and determining a stable trigger point.