Technical data

Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs 4
4000 X-Series Oscilloscopes Advanced Training Guide 97
Your scope should now be triggering on Tx = 4D
HEX
while displaying this
byte at center- screen similar to Figure 62. Let’s now set up the scope to
capture a longer record of time (2 seconds) and review our data in a
“lister” format.
25 Set the scope’s timebase to 200.0 ms/div.
26 Press [Run/Stop] to stop repetitive acquisitions.
27 Press the [Serial] front panel key.
28 Tap the Lister softkey; then select Half-Screen from the Window menu.
29 Tap the Scroll Lister softkey; then turn the Entry knob to scroll through
the decoded data.
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 RS232/UART byte of data, tap the Zoom to Selection
softkey. This particular stream of RS232/UART data includes some
infrequent parity errors (marked in red). But locating the occasional parity
bit error conditions can be difficult using the manual scrolling method if
the parity bit errors are very infrequent. So let’s now perform an
Figure 62 Triggering on Tx = 4D
HEX
.