Protocol analysis
R&S
®
RTP
561User Manual 1337.9952.02 ─ 12
Time segment1, Time segment2
Set the number of time quanta before the sample point (Time segment 1) and after the
sample point (Time segment 2).
The "Sample point" percentage value is adjusted accordingly.
Time segments 1 comprises the segments Synch_seg, Prop_seg, and Phase_seg1
which are specified in the CAN standard. Time seg2 matches Phase_seg2 from the
standard.
The maximum sum of Time segment 1 and Time segment 2 is 24.
Remote command:
BUS<m>:CAN:T1Segment on page 1619
BUS<m>:CAN:T2Segment on page 1619
BUS<m>:CAN:FDATa:T1Segment on page 1619
BUS<m>:CAN:FDATa:T2Segment on page 1619
Sample point
Sets the position of the sample point within the bit in percent ot the nominal bit time.
The time quanta values "Time segment1, Time segment2" are adjusted accordingly.
Remote command:
BUS<m>:CAN:SAMPlepoint on page 1618
BUS<m>:CAN:FDATa:SAMPlepoint on page 1618
Jump width
Time segment1 may be lengthened or time segment2 may be shortened due to
resynchronization. Resynchronization corrects the phase error of an edge caused by
the drift of the oscillators. The jump width defines the maximum number of time quanta
for phase correction. The maximum value of the jump width is 4, or Time seg1 - Time
seg2 if this difference is lower than 4.
Remote command:
BUS<m>:CAN:JWIDth on page 1620
BUS<m>:CAN:FDATa:JWIDth on page 1620
13.5.2.3 Display settings
Access: [Protocol] > "Display" tab.
For common display settings, see Chapter 13.1.3, "Display", on page 514.
DBC Files for CAN / CAN FD
Industry-standard DBC files contain more information than PTT and CSV files and
translate the abstract decode results to human language. For each frame, the frame ID
and the symbolic name of the ID are given; the frames are also called messages in
CAN. The data of a CAN message can consist of several "signals". The DBC file pro-
vides the label, unit, start bit, length and other indicators for each signal. For state-
encoded signals, the meaning of the states is given.
In the demo example, the message "EngineData" has the decimal ID 2,166,573,756
and consists of 8 data bytes. These 8 bytes are defined as 6 signals. The first one,
CAN and CAN FD (option R&S
RTP-K3/K9)
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