UART/RS232/422/485 Triggering and Protocol Decode 29
Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide 359
• Rx 0:Data, Tx 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, Tx 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).
• Rx Parity Error, Tx Parity Error — Triggers on a parity error when parity is set in
the bus configuration.
When you select a trigger condition that includes "Data" (for example: Rx Data):
• Data is — Selects an equality qualifier. You can choose = (Equal),
≠ (Not equal), < (Less than), or > (Greater than) a specific data value.
• Data — Specifies the data value.
• Base — Selects the format in which you would like to enter data values to trigger
on, Hex or ASCII.
Note that this setting does not affect the base used in the decode display.
• Burst — Lets you trigger on the Nth frame (1-4096) after an Idle time you enter.
All trigger conditions must be met for the trigger to occur.
Idle times from 1 µs to 10 s can be entered. The oscilloscope will look for a
trigger condition only after the Idle time has past.
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