338 Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide
25 UART/RS232 Triggering and Serial Decode
• Rx 1:Data — For use when the device under test data words are 9 bits in
length including the alert bit (the 9th bit). Triggers only when the 9th (alert)
bit is 1. The specified data byte applies to the least significant 8 bits
(excludes the 9th (alert) bit).
• Rx 0:Data — For use when the device under test data words are 9 bits in
length including the alert bit (the 9th bit). Triggers only when the 9th (alert)
bit is 0. The specified data byte applies to the least significant 8 bits
(excludes the 9th (alert) bit).
• Rx X:Data — For use when the device under test data words are 9 bits in
length including the alert bit (the 9th bit). Triggers on a data byte that you
specify regardless of the value of the 9th (alert) bit. The specified data byte
applies to the least significant 8 bits (excludes the 9th (alert) bit).
• Similar choices are available for Tx.
• Rx or Tx Parity Error — Triggers on a parity error based on the parity you have
set in the Bus Configuration Menu.
6 If you choose a trigger condition that includes "Data" in its description (for
example: Rx Data), then press the Data is softkey, and choose an equality
qualifier. You can choose equal to, not equal to, less than, or greater than a
specific data value.
7 Use the Data softkey to choose the data value for your trigger comparison. This
works in conjunction with the Data is softkey.
8 Optional: The Burst softkey lets you trigger on the Nth frame (1-4096) after an
idle time you select. All trigger conditions must be met for the trigger to occur.
9 If Burst is selected, an idle time (1 µs to 10 s) can be specified so that the
oscilloscope will look for a trigger condition only after the idle time has past.
Press the Idle softkey and rotate the Entry knob to set an idle time.
If the setup does not produce a stable trigger, the UART/RS232 signals may be slow enough
that the oscilloscope is AutoTriggering. Press the [Mode/Coupling] key, then press the Mode
softkey to set the trigger mode from Auto to Normal.
To display UART/RS232 serial decode, see “UART/RS232 Serial Decode" on page 339.
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