404 Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide
25 CAN/LIN Triggering and Serial Decode
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.
CAN Totalizer
The CAN totalizer provides a direct measure of bus quality and efficiency. The CAN
totalizer measures total CAN frames, Specification error counter, flagged error
frames, and bus utilization.
The totalizer is always running (counting frames and calculating percentages) and
is displayed whenever CAN decode is displayed. The totalizer counts even when
the oscilloscope is stopped (not acquiring data). Pressing the [Run/Stop] key does
not affect the totalizer. When an overflow condition occurs, the counter displays
OVERFLOW. The counters can be reset to zero by pressing the Reset CAN Counters
softkey.
Types of Frames • Active error frames are CAN frames in which a CAN node recognizes an error
condition during a data or remote frame and issues an active error flag.
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