Technical data

94 3000 X-Series Oscilloscopes Advanced Training Guide
4 Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
You should now see on your scope’s display what appears to be an
un- triggered display of a digital burst signal similar to Figure 67. 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 Press the Mode I
2
C softkey; then select the CAN serial decode mode using
the Entry knob.
11 Press the Signals softkey; then 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).
You should now see CAN decoding of this signal on your scope’s display
similar to Figure 68, but we still haven’t established stable triggering. The
scope is still triggering on any rising edge of channel- 1 (default trigger
condition). Let’s now set up the scope to trigger on a CAN data frame
with the ID = 07F
HEX
.
13 Press the [Trigger] front panel key.
14 Select Serial 1 (CAN) using the Entry knob.
Figure 68 Decoding a CAN bus while triggering on any rising edge of the input signal.