15 UART/RS232 Triggering and Serial Decode
336 InfiniiVision 7000B Series Oscilloscopes User’s Guide
Note that the setting of this softkey does not affect the selected base of
the decode display.
3 Press the Trigger Setup softkey and set up the desired trigger condition:
• Rx Start Bit — The oscilloscope triggers when a start bit occurs on Rx.
• Rx Stop Bit — Triggers when a stop bit occurs on Rx. The trigger will
occur on the first stop bit. This is done automatically whether the
device under test uses 1, 1.5, or 2 stop bits. You do not need to
specify the number of stop bits used by the device Under test.
• Rx Data — Triggers on a data byte that you specify. For use when the
device under test data words are from 5 to 8 bits in length (no 9th
(alert) bit).
• 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.
4 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.
5 Use the Data softkey to choose the data value for your trigger
comparison. This works in conjunction with the Data is softkey.
6 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.
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