Serial Bus Analysis
R&S
®
RTC1000
145
User Manual 1335.7352.02 ─ 02
"CRC"
CAN uses a complex checksum calculation called Cyclic Redundancy
Check. The transmitter calculates the CRC and transmits the result in
a CRC sequence. The receiver calculates the CRC in the same way.
A CRC error occurs if the calculated result differs from the received
CRC sequence.
IDENTIFIER
Triggers on an address or address range. Configure the following:
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IDENTIFIER AND DATA
Triggers on a combination of identifier and data pattern. Configure the following:
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FRAME TYPE
Selects the frame type: remote or data frame, or both.
IDENTIFIER SETUP
Defines the address of the data pattern:
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"ID TYPE", the length of the identifier (11 bit for CAN base frame format, or 29 bit
for extended CAN frames).
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Address pattern:
DATA SETUP
Specify the data pattern for up to 8 bytes.
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"DATA LENGTH", the number of data bytes to be compared.
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Data pattern:
COMPARE
Defines the comparison function for data and address patterns. If the pattern includes
at least one X (do not care), you can trigger on a value equal or not equal to the speci-
fied value. If the pattern includes only 0 or 1, you can trigger on an area greater than or
less than the specified value.
11.6.3 CAN Decode Results
Certain portions of the CAN messages are displayed in color to recognize the different
elements:
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White: Data length code, number of data bytes
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Cyan: Data words
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Magenta: Identifier
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Red: Frame error
CAN Bus (Option R&S
RTC-K3)
