UART/RS232 Triggering and Serial Decode 29
Keysight InfiniiVision 1200 X-Series and EDUX1052A/G Oscilloscopes User's Guide 317
• 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 UART Bus Config menu.
7 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.
8 Use the Data softkey to choose the data value for your trigger comparison. This
works in conjunction with the Data is softkey.
9 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.
10 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.
To display UART/RS232 serial decode, see "UART/RS232 Serial Decode" on
page 318.
If the setup does not produce a stable trigger, the UART/RS232 signals may be slow enough
that the oscilloscope is auto-triggering. Press the [Trigger] key, then press the Mode softkey
to set the trigger mode from Auto to Normal.
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