4-3
IM 701450-51E
4
Specification
4.2
CAN Bus Signal Analysis Function
Supported CAN Bus
Item
Specifications
CAN Bus
CAN Version 2.0B
Bit rate
Set any of the following bit rates: 1 M, 500 k, 250 k, 125 k, 100 k, 95.238 k, 83.333 k, 62.5 k,
50 k, 33.333 k, 20 k, or 10 k [bps] or an arbitrary bit rate between 1 M to 10 k [bps] (The
resolution is the bit time (reciprocal of the bit rate of 0.5
µ
s).
Supports High speed CAN(ISO11898) and Low speed CAN(ISO11519-2)
Trigger Function
Item
Specifications
Trigger source
CH1:
CAN bus signal
(Input CAN_H and CAN_L signals via differential probes.)
CH2 to CH8*:
Analog signal input
CAN bus signal trigger
Activates a trigger on the combination (AND logic) of the five items below. Start of Frame is
always enabled. Identifier, RTR, Data Field, and Error Frame can be enabled or disabled.
However, the combination of RTR and Data Field is not allowed.
• Start of Frame:
Activates a trigger on the Start of Frame (SOF). The trigger point is at the
end of the Start of Frame.
• Identifier:
Activates a trigger on the Identifier (ID: up two four types can be specified)
that matches the specified conditions. A trigger is activated on the OR
logic of the four types of IDs. The trigger point is at the end of the ID.
• RTR:
Activates a trigger on a remote frame (RTR is recessive). The trigger
point is at the end of the RTR bit.
• Data Field:
Activates a trigger at the data field that matches the specified conditions
(up to 8 bytes can be specified). The trigger point is at the end of data
field.
• Error Frame:
Activates a trigger on an error frame. An error frame trigger applies to the
case when 6 successive dominant (logical value: 0) bits are detected. A
trigger also occurs if 6 successive dominant bits occur in an overload
frame. The trigger point is at the end of the 6th dominant bit.
Combination trigger
Possible to activate triggers by combining the CH2 to CH8* analog signals and the CAN bus
signal (CH1).
• CAN Only:
Activates a trigger only on the trigger conditions of the CAN bus signal.
• CAN on Pattern: Activates a trigger when the CAN trigger conditions are met on the true or
false condition of the CH2 to CH8* parallel pattern.
• CAN -> Pattern: Activates a trigger when the trigger conditions of the parallel pattern of
CH2 to CH8* are met after the trigger conditions of the CAN Bus signal
are met.
* CH2 to CH4 on the DL7440
Analysis Function
Item
Specifications
Signal input
Select CH1 or CH3.
Number of frames that can
Up to 16000 bytes (Analysis numbers are assigned in the range of –16000 to 16000 with
be analyzed and displayed
respect to the reference point position.
Frames that are analyzed
Three types: Remote Frame, Data Frame, and Identifier.
Display of the analysis results Displays the analysis results using the following two methods.
• Waveform and the list of analysis results
Simultaneously displays the waveform and the list of analysis results (No. (frame type and
No.), ID (Identifier value (standard format or extended format), Dt (hexadecimal display of
the data field value), and ACK (Acknowledge bit condition).
• List of detailed analysis results
Displays No. (frame type and No.), Time (time from the trigger point to Start of Frame), ID
(Identifier value (standard format or extended format)), Data (hexadecimal or binary display
of the data field value), CRC (hexadecimal display of the CRC value), ACK (Acknowledge bit
condition), and Info. (error type).
Stuff bit computation
Extracts stuff bits from the CAN Bus waveform and displays them as a Math waveform (Math1).
