R&S RTA4000, User Manual

Page: 291 / 861

Serial bus analysis
R&S
®
RTA4000
291 User Manual 1335.7898.02 ─ 08
Stuff Bit ← Error
The following frame segments are coded by the bit stuffing method:
●
Start of frame
●
Arbitration field
●
Control field
●
Data field
●
CRC sequence
The transmitter automatically inserts a complementary bit into the bitstream when it
detects five consecutive bits of identical value in the bitstream to be transmitted. A stuff
error occurs when the 6
th consecutive equal bit level in the mentioned fields is detec-
ted.
Remote command:
TRIGger:A:CAN:BITSterror
on page 643
Form ← Error
A form error occurs when a fixed-form bit field contains one or more illegal bits.
Remote command:
TRIGger:A:CAN:FORMerror
on page 644
Acknowledge ← Error
An acknowledgment error occurs when the transmitter does not receive an acknowl-
edgment - a dominant bit during the "Ack" slot.
Remote command:
TRIGger:A:CAN:ACKerror
on page 643
CRC ← Error
CAN uses the Cyclic Redundancy Check (CRC), which is a complex checksum calcu-
lation 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:A:CAN:CRCerror
on page 643
Identifier condition
The identifier condition consists of the following settings:
●
ID Type
●
Comparison
●
Identifier value
Compare ← Identifier condition
Sets the identifier comparison condition: If the identifier pattern contains at least one X
(do not care), you can trigger on values equal or not equal to the specified value. If the
pattern contains only 0 and 1, you can also trigger on a range greater than or lower
than the specified value.
Remote command:
TRIGger:A:CAN:ICONdition
on page 642
CAN (option R&S RTA-K3)