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Protocol analysis
R&S
®
MXO 4 Series
334User Manual 1335.5337.02 ─ 05
"Form error"
A form error occurs when a fixed-form bit field contains one or more
illegal bits.
"Bit stuffing
error"
The frame segments Start Of Frame, Arbitration Field, Control Field,
Data Field and CRC Sequence are coded by the bit stuffing method.
The transmitter automatically inserts a complementary bit into the bit
stream when it detects five consecutive bits of identical value in the
bit stream to be transmitted. A stuff error occurs when the 6th consec-
utive equal bit level in the mentioned fields is detected.
"Stuff count
error"
A stuff bit error occurs, if more than five consecutive bits of the same
level occur on the bus.
"Ack error"
An acknowledgement error occurs when the transmitter does not
receive an acknowledgment - a dominant bit during the Ack Slot.
"Checksum
error"
CAN uses the Cyclic Redundancy Check, which is a complex check-
sum calculation method. The transmitter calculates the CRC and
sends the result in the CRC sequence. The receiver calculates the
CRC in the same way. A CRC error occurs when the calculated result
differs from the received value in the CRC sequence.
Remote command:
TRIGger:CAN:FORMerror on page 651
TRIGger:CAN:BITSterror on page 652
TRIGger:CAN:FDATa:SCERror on page 652
TRIGger:CAN:ACKerror on page 652
TRIGger:CAN:CRCerror on page 653
CAN (option R&S
MXO4-K520)
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