Protocol analysis
R&S
®
RTP
571User Manual 1337.9952.02 ─ 12
The instrument skips the first 3 data bytes and starts comparing the data pattern with
the 4th data byte. So, the byte with value 17 can be found between the 11th and the
19th data byte.
13.5.4 CAN and CAN FD decode results
When the configuration of the serial bus is complete, the signal can be decoded:
1. In the "Protocol" dialog > "Setup" 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 514.
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 binary results of data bytes are displayed MSB first.
For CAN protocol, the endianness setting ("Transfer") is a trigger setting and not con-
sidered for decoding.
You can also load and apply industry-standard DBC files. The symbolic names from
the file are applied to the display of the decoded data, see Chapter 13.5.6.2, "Symbolic
decode waveform", on page 579.
Table 13-6: Content of the Decode results table
Column Description
State Overall state of the frame.
"Insuffcient waveform length" indicates that the frame is not completely contained
in the acquisition. Change the horizontal scale, or move the reference point to the
left to get a longer acquisition.
Frame start Time of frame start
Type Frame type: Data, Remote, Error, or Overload
ID value (hex) Identifier value, hexadecimal value
CAN and CAN FD (option R&S RTP-K3/K9)
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