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4
Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
Figure 45 Triggering on Tx = 4D
Your scope should now be triggering on Tx = 4D
byte at center- screen similar to
capture a longer record of time (2 seconds) and review our data in a
"lister" format.
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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, either push the Entry knob,
or press 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 automatic search to find every
occurrence of parity bit errors on both the Tx and Rx data lines. We will
then automatically navigate to each of these occurrences.
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Set the scope's timebase to 200.0 ms/div.
Press [Run/Stop] to stop repetitive acquisitions.
Press the [Serial] front panel key.
Press the Lister softkey; then select Serial 1 (UART/RS232) using the Entry
knob.
Press the Scroll Lister softkey; then turn the Entry knob to scroll through
the decoded data.
.
HEX
Figure
45. Let's now set up the scope to
2000 X-Series Oscilloscopes Advanced Training Guide
while displaying this
HEX
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