CAN Triggering and Protocol Decode 25
Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide 327
• Blue mid-level lines show an idle bus.
• Frame ID — yellow.
• Data bytes — white hex digits.
• CAN frame type and Data Length Code (DLC) — blue for data frames, green for
remote frames. The DLC is always a decimal value. CAN frame types can be:
• FD — a CAN FD frame whose bit rate does not switch during the data phase.
• BRS — a CAN FD frame whose bit rate switches during the data phase.
• RMT — a standard CAN remote frame.
• Data — a standard CAN data frame.
The status of the Error State Indicator (ESI) flag is shown in the "Type" column
of the Lister. If the ESI bit is recessive, indicating error passive, the background
of the "Type" column will be yellow. If the ESI bit indicates error active, the
"Type" column's background will be unshaded.
The DLC field will always be displayed in decimal, and will indicate the number
of bytes in the frame. So for example, for an FD frame that has the DLC code
0xF, which represents a packet with 64 bytes, "DLC=64" will be displayed on
the decode line, and "64" will be displayed in the DLC column of the Lister.
• Overload frame — blue with the text "OVRLD". An overload condition may occur
before an end of frame condition. If so, the frame is closed and opened with
blue brackets at the start of the overload condition.
• Stuff Count — green hex digit when valid, red when error detected. The hex digit
shows the gray-coded with parity bit stuff count.
• CRC — blue hex digits when valid, red when error detected.
• Red angled waveforms — Unknown or error condition.
• Flagged error frames — red with "ERR FRAME", "STUFF ERR", "FORM ERR",
"ACK ERR", "GLITCH ERR", or "?" (unknown).
• Pink vertical bars — Expand horizontal scale (and run again) to see decode.
• Red Dot — More information is available. Decoded text is truncated to fit.
Expand the horizontal scale to view the information.
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