Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
4
3000 X-Series Oscilloscopes Advanced Training Guide
95
15
Press
Trigger: SOF
; then select
Data Frame ID (~RTR)
using the Entry knob.
16
Press the
Bits
softkey.
17
Press the
Hex
softkey; then select
F
using the Entry knob.
Your scope should now be triggering on CAN data frame = 07F
HEX
as
. With this scope’s very fast hardware- based decoding,
you should also see some decoded red “flashing” near the end of this
packet/frame of data. This is an indication that the scope is capturing and
quickly decoding infrequent Error Frames. Let’s now capture a very long
stream of CAN traffic (1 second of acquisition time) and then manually
search through the captured and decoded record.
18
Press the
[Serial]
front panel key.
19
Press the
Lister
softkey; then turn the Entry knob to select
Serial 1 (CAN)
.
20
Set the scope’s timebase to
100.00 ms/div
.
21
Press
[Run/Stop]
to stop repetitive acquisitions.
22
Press the
Scroll Lister
softkey; then turn the Entry knob to manually
scroll through the lister table.
As you scroll through the data, note that waveforms “track”. This means
that the frame that the arrow points to in the lister table corresponds to
the waveforms that are positioned at center- screen. If you want to zoom
in on a particular CAN frame of data, either push the Entry knob, or
press the
Zoom to Selection
softkey. Looking for infrequent errors in this
Figure 69
While triggering on CAN data frame = 07F
HEX
, the scope’s hardware-based
decoding reveals infrequent error conditions.