Technical data

100 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 73. 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 LIN serial bus traffic. Let’s first set up the scope to
intelligently decode this serial data stream based on the LIN protocol, and
then we will establish a more unique trigger point using LIN triggering.
9 Press the [Serial] front key.
10 Press the Mode I
2
C softkey; then select the LIN serial decode mode using
the Entry knob.
11 Press the Signals softkey and verify that the Baud Rate is set to 19.2 kb/s.
You should now see LIN protocol decoding of this signal on your scope’s
display similar to Figure 74, 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 LIN
frame with the ID = 21
HEX
.
12 Press the [Trigger] front panel key.
13 Select Serial 1 (LIN) using the Entry knob.
14 Press Trigger: Sync; then select ID – Frame ID using the Entry knob.
15 Press the Bits softkey.
16 Press the Frame ID softkey; then set ID = 0x21 using the Entry knob.
Figure 74 Decoding a LIN bus while triggering on any rising edge of the input signal.