User Manual

Protocol Analysis
R&S
®
Scope Rider RTH
191User Manual 1326.1578.02 ─ 08
Identifier Relation
Defines how the specified identifier pattern is compared with the acquired signal. The
instrument triggers if the acquired address is equal or unequal the defined pattern.
Remote command:
TRIGger:LIN:ICONdition on page 414
Data Pattern
Specifies the data pattern to be found, in binary or hex format. Enter the pattern in
MSB first bit order.
See also Chapter 2.5.12.1, "Pattern Definition", on page 66.
Remote command:
TRIGger:LIN:DATA on page 414
Data Relation
Defines how the specified data pattern is compared with the acquired signal. The
instrument triggers if the acquired address is equal or unequal the defined pattern.
Remote command:
TRIGger:LIN:DCONdition on page 414
Address from Label
If a label list with node names was loaded and applied in the bus configuration, you
can select the node name from the list instead of entering the numeric identifier.
The instrument triggers on the identifier of the selected node.
Error conditions: CRC, Bit stuffing, Form, Ack
If a CAN detects a bit stuffing error, form error, or ack error, it transmits an error flag at
the next bit. The R&S RTH detects errors in the message and triggers on these errors
even if no CAN node sends an error flag.
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CRC error
CAN uses the cyclic redundancy check (CRC), which is a complex checksum cal-
culation 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.
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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 automati-
cally inserts a complementary bit into the bit stream when it detects five consecu-
tive bits of identical value in the bit stream to be transmitted. A stuff error occurs
when the 6th consecutive equal bit level in the mentioned fields is detected.
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Form error
A form error occurs when a fixed-form bit field contains one or more illegal bits.
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Ack error
An acknowledgement error occurs when the transmitter does not receive an
acknowledgment - a dominant bit during the ack slot.
CAN (Option R&S RTH-K3)