Serial bus analysis
R&S
®
RTA4000
281User Manual 1335.7898.02 ─ 08
13.4.3 UART trigger
Before you set up the trigger, make sure that the bus is configured correctly. See
Chapter 13.4.2, "UART configuration", on page 278.
To trigger on UART signals:
1. Press the [Protocol] key in the Analysis area of the front panel.
2. Select the bus that is configured for UART.
3. Select "Trigger".
This selection has several effects:
● Enables decoding, if necessary.
● Sets the "Trigger Type" to "Serial Bus" and the trigger source to the selected
bus.
● Displays the "UART Trigger" condition in the dialog box, below the protocol
setup.
4. In the menu, select the "Source".
5. At "UART Trigger", select the required trigger condition:
● "Start Bit" or "Frame Start": next start bit or first start bit after idle time
● "Frame Start"
● "Frame Error"
● "Symbol <n>": frame number in a data stream
● "Break": a start bit not followed by a stop bit
● "Parity Error"
● "Pattern": serial pattern of 1, 2, 3 or 4 symbols at a defined position in the data
stream
● "Any Symbol": pattern of data bits anywhere in a data stream
6. If "Pattern" or "Any Symbol" is selected, the UART trigger setup dialog expands to
define the serial pattern or the symbol.
UART / RS232 (option R&S RTA-K2)
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