15 UART/RS232 Triggering and Serial Decode
334 InfiniiVision 7000B Series Oscilloscopes User’s Guide
Setup for UART/RS232 Signals
To set up the oscilloscope to capture UART/RS232 signals, use the Signals
and Bus Config softkeys which appear in both the Trigger Menu and the
Serial Decode Menu:
1 Press [Label] to turn on labels.
2 Press [Trigger]; then, select the UART/RS232 trigger type.
3 Press Signals to open the UART/RS232 Signals Menu.
4 Connect an oscilloscope channel to the Rx signal in the device under
test, then press the Rx softkey and rotate the Entry knob to select the
channel.
As you press the Rx softkey (or rotate the Entry knob), the channel you
select is shown in the upper-right corner of the display next to “URT”.
5 Make sure the trigger or threshold levels are set to the middle of the
signal:
• For analog channels, turn the Trigger Level knob.
• For digital channels, press the [Digital] key and the Thresholds softkey
to access the threshold level setting softkeys.
The value of the trigger level or digital threshold is displayed in the
upper- right corner of the display.
6 Repeat these steps for the Tx signal.
7 Press the [Menu Up] key to return to the Trigger Menu.
8 Press Bus Config to open the UART/RS232 Bus Configuration Menu.
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