Rohde & Schwarz RTE - Triggering on UART Signals; UART Decode Results

Protocol analysis
R&S
®
RTE
558User Manual 1326.1032.02 ─ 20
Index min, Index max ← Data conditions
Sets the number of words before the first word of interest. These offset words are
ignored. If the Position defines a range, the first and the last words of interest are
defined.
The setting is available if packet detection is enabled in the protocol configuration.
Remote command:
TRIGger<m>:UART:DPOSition on page 1484
TRIGger<m>:UART:DPTO on page 1484
13.4.3.2 Triggering on UART signals
Prerequisites: An UART bus is configured, see Chapter 13.4.3.1, "UART trigger set-
tings", on page 556.
1. Press the [PROTOCOL] key and select the "Trigger" tab.
2. Press the "Select" button. The "Source" button is shown.
3. Tap the "Source" button and select the "Serial bus" trigger source.
4. Select the serial bus that is set to UART.
5. Select the "Trigger type" and "Trigger source".
6. For more complex trigger types, enter the data conditions: pattern, position, index.
For details, see Chapter 13.2.3, "I²C trigger", on page 526
13.4.4 UART decode results
When the configuration of the serial bus is complete, the signal can be decoded:
1. In the "Protocol" dialog > "Decode" tab, enable "Decode".
2. In the "Protocol" dialog > "Display" tab, select additional result display settings:
"Show decode table" and "Show binary signals".
For a description of the display settings, see also Chapter 13.1.3, "Display",
on page 515.
The instrument captures and decodes the signal according to the standard definition
and the configuration settings.
The color-coding of the various protocol sections and errors simplifies the interpretation
of the visual display. The decode information condenses or expands, depending on the
horizontal scale. Various data formats are available to show the result values.
The decoding process considers the "Bit order" configuration setting of the signal and
displays the binary result MSB first. Binary values in the combs of the decoded signal
also consider the "Binary bit order" setting in the "Display" tab. Thus, you can read the
bits of an LSB first signal in LSB first order in the combs while the results table displays
the correct values MSB first.
UART/RS-232/RS-422/RS-485 (option R&S
RTE-K2)