Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
4
4000 X-Series Oscilloscopes Advanced Training Guide
103
You should now see on your scope’s display what appears to be an un-triggered
display of a digital burst signal similar to
. Your scope is actually
triggering on random rising edges of channel-1, which is the scope’s default
trigger condition. But this signal is too complex to establish a unique trigger point
using simple edge triggering. This signal is a packet/frame of CAN serial bus
traffic. Let’s first set up the scope to intelligently decode this data stream based on
the CAN protocol, and then we will establish a more unique trigger point using
CAN triggering.
9
Press the
[Serial]
front panel key.
10
Tap the
Mode I
2
C
softkey; then select the
CAN
serial decode.
11
Tap the
Signals
softkey; then from the
Signal
menu, select
CAN_L
.
12
With the Signals menu active, also verify that the input
Source
is defined as
channel-1 and the baud rate is set to
125 kb/s
(default conditions).
Figure 67
Capturing a CAN frame using the scope’s Edge triggering mode.
