YOKOGAWA DL7200 User manual

User’s
Manual
Yokogawa Electric Corporation
IM 701430-51E
DL7200
Digital Oscilloscope
CAN Bus Signal Analysis Function
IM 701430-51E
2nd Edition

i
IM 701430-51E
Disk No. DL19
2nd Edition: Sep. 2002 (YK)
All Rights Reserved, Copyright © 2001 Yokogawa Electric Corporation
Thank you for purchasing the DL7200 Digital Oscilloscope with the CAN Bus Signal
Analysis Function. This user’s manual describes only the Can Bus analysis function.
For information about other functions, operating procedures, and handling precautions of
the DL7200, see the following manuals:
Manual Title Manual No. Description
DL7100/DL7200 IM701410-01 Explains all functions and procedures of the
User’s Manual DL7100/DL7200 excluding the communication functions.
DL7100/DL7200GP-IB IM701410-11 Describes the communication functions of the
Interface User’s Manual communication interface.
DL7100/DL7200 IM701410-02 Explains only the basic operations of the instrument.
Notes •The contents of this manual are subject to change without prior notice as a result of
improvements in the instrument’s performance and functions. The figures given in
this manual may differ from the actual screen.
•Every effort has been made in the preparation of this manual to ensure the accuracy
of its contents. However, should you have any questions or find any errors, please
contact your nearest YOKOGAWA dealer as listed on the back cover of this manual.
•Copying or reproducing all or any part of the contents of this manual without the
permission of Yokogawa Electric Corporation is strictly prohibited.
•Aguarantee card is attached to the instrument. The card will not be reissued, so
please read it carefully and keep it in a safe place.
CAN Bus Signal Analysis Function
CAN stands for Controller Area Network. It is a serial communication protocol standardized
internationally by the ISO (International Organization for Standardization).
In communications that use CAN, analysis of the physical layer of the CAN Bus is required when
troubleshooting problems that occur due to noise caused by surge voltage and level fluctuations
caused by excessive load after connection. By using this function, data can be analyzed while
displaying the signal waveforms on the CAN Bus as analog waveforms. In addition,
synchronized monitoring of the data on the bus and the analog waveform is possible.
The CAN Bus signal analysis function consists of the following four functions.
•Trigger Function
Acquires signals using the Identifier and Data values of the CAN Bus frame as trigger
conditions. Triggers can also be activated according to the frame type.
•Waveform analysis function
Displays the Identifier and Data values of the acquired waveform in hexadecimal or
binary notation for each frame. Frame type, error type, and other information can also
be displayed simultaneously. Stuff bits can also be detected. The analysis results
can be output to a file in ASCII format.
•Search function
You can search data that match a specified data pattern (dominant, recessive,
indefinite data) and display the result.
•Field Jump function
The beginning of the waveform of the specified field can be displayed.
Trademarks •Adobe and Acrobat are trademarks of Adobe Systems Incorporated.
•PostScript is a registered trademark of Adobe Systems Incorporated.
•Other company and product names are trademarks or registered trademarks of their
respective companies.
Revisions •First Edition July 2001
•Second Edition September 2002

ii IM 701430-51E
Contents
CAN Bus Signal Analysis Function ...................................................................................... i
1. Connecting a Probe ............................................................................................................1
2. Setting the Trigger Conditions............................................................................................. 3
3. Setting the Cursor ............................................................................................................. 10
4. Analyzing and Searching .................................................................................................. 12
5. Performing Stuff Bit Computation ..................................................................................... 21
6. Outputting the Analysis Results to a File .......................................................................... 22
7. Error Messages................................................................................................................. 24
8. Specifications.................................................................................................................... 25
9. Communications Commands............................................................................................ 26
10. Index ................................................................................................................................. 40

1
IM 701430-51E
1. Connecting a Probe
Input Terminals A probe (or an input cable such as a BNC cable) must be connected to one of the input
terminals* (CH1 to CH4) located on the lower section of the front panel.
The input impedance is 1 MΩ±1.0% and approximately 20 pF or 50 Ω±1.0%.
*The number of input terminals varies according to machine model.
CAUTION
•The maximum allowable input voltage is 400 V (DC + AC peak) or 282 Vrms
when the frequency is 1 kHz or less. Never input a voltage exceeding this level,
as it could damage the input section of the instrument. If the frequency exceeds
1 kHz, the input section may be damaged even when the voltage is below 400 V.
•The maximum allowable input voltage is 5 Vrms or 10 Vpeak when using 50-Ωinput.
Never input voltage exceeding this level, as it could damage the input section of this
instrument.
CH 1
1 M Ω 20 pF 400 Vpk 50
Ω 5 Vrms, 10 vPK
CAT
CH 2 CH 3 CH 4
Points to Note when Connecting a Probe
•When measuring the CAN Bus signal, connect to CH1 using a differential probe
(recommended differential probe: 701920 by YOKOGAWA). The power to the
differential probe (701920) can be connected to the “PROBE POWER” terminal on the
rear panel of the DL7200.
•When connecting a probe to the instrument for the first time, perform phase correction
of the probe as described in the section 3.5, “Compensating the Probe (Phase
Correction)” in the
DL7100/DL7200 User’s Manual IM701410-01E . Failure to do so
may result in unstable gain across different frequencies, thereby preventing correct
measurement. Calibration must be performed for each channel.
•If the object to be measured is connected to the instrument directly, without using a
probe, correct measurement cannot be performed due to the load effect.

2IM 701430-51E
Connection Method of the Differential Probe
The CAN Bus has two logical values, dominant and recessive.
Depending on how the differential probe is connected, the voltage level of either
dominant or recessive can be displayed higher.
However, the DL7200 handles the dominant logical value as 0 and recessive logical
value as 1. Change the Vdiff setting in the trigger condition menu and analysis/search
menu according to how the probe is connected.
When setting the recessive voltage level higher than the dominant level (Vdiff =
CAN_L–CAN_H)
Recessive (logical value 1)
Dominant (logical value 0)
For a two-wire system (differential), connect the wires as follows:
Connect the differential probe negative (–) to CAN_H.
Connect the differential probe positive (+) to CAN_L.
For a single-wire system (single-ended), connect the wires as follows:
Connect the differential probe negative (–) to CAN_H.
Connect the differential probe positive (+) to GND (earth potential).
When setting the dominant voltage level higher than the recessive level (Vdiff =
CAN_H–CAN_L)
Recessive (logical value 1)
Dominant (logical value 0)
For a two-wire system (differential), connect the wires as follows:
Connect the differential probe negative (–) to CAN_L.
Connect the differential probe positive (+) to CAN_H.
For a single-wire system (single-ended), connect the wires as follows:*
Connect the differential probe positive (–) to GND (earth potential).
Connect the differential probe positive (+) to CAN_H.
*In this case the passive probe can be connected to CAN_H.
1. Connecting a Probe

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2. Setting the Trigger Conditions
The CAN Bus signal analysis function uses a dedicated trigger for acquiring waveforms.
Function
Setting the Trigger Pattern
Setting the Bit Rate
Select the CAN Bus transfer rate.
Selectable values: 1 M, 500 k, 250 k, 125 k, 100k, 83,3 k, 50 k, and 33.3 kbps
Setting the Sample Point
Specify the sample point within the bit time.
Selectable values: 18.8, 21.9, 25.0, 28.1, 31.3, 34.4, 37.5, 40.6, 43.8, 46.9, 50.0, 53.1,
56.3, 59.4, 62.5, 65.5, 68.8, 71.9, 75.0, 78.1, 81.3, 84.4, 87.5, and
90.6 (%)
Setting the Message Format
Std: Standard format
Ext: Extended format
Setting Vdiff
Select the connection method of the differential probe. See section 1, “Connecting the
Probe.”
Select Vdiff from the following two types. In either case, the logical value is recessive =
1 and dominant = 0.
CAN_L–CAN_H: The recessive electric potential is set higher than the dominant
electric potential.
CAN_H–CAN_L: The dominant electric potential is set higher than the recessive
electric potential.
Note
The bit rate, sample point, and Vdiff settings are synchronized with the analysis menu
(section 4, “Analyzing and Searching”).
Setting the Pattern Format
Set the format of the Identifier field and the Data field.
Hex: Hexadecimal
Bin: Binary

4IM 701430-51E
Activating the Trigger on Fields and Frames
Specify the type of CAN signal field or frame to be used as trigger conditions from the
following five types. The trigger is activated on the AND condition of the five types
(combination trigger). However, RTR and Data Field cannot be specified in combination.
•Start of Frame: Activates the trigger on the Start of Frame. The trigger point is set
to the end of the Start of Frame.
•Identifier: Activates the trigger on an Identifier matching the specified
condition. The trigger point is set to the end of the Identifier.
•RTR: Activates the trigger on a remote frame (RTR is recessive). The
trigger point is set to the end of the RTR bit.
•Data Field: Activates the trigger on a data field matching the specified
condition. The trigger point is set to the end of the data field.
•Error Frame: Activates the trigger on an error frame. The DL7200 considers 6
successive dominant bits as an error frame trigger condition.
Therefore, a trigger occurs if 6 successive dominant bits occur in
an overload frame. The trigger point is set to the end of the 6th bit.
If multiple field and frame types are combined, the trigger point is set to the trigger point
of the type that appeared last in the time sequence.
If you specified Identifier or Data Field, specify the bit pattern.
When using hexadecimal notation, enter X or 0 through F in units of 4 bits.
When using binary notation, enter X, 0, or 1.
The following figure shows the field and frame formats and trigger position.
S: Trigger position of the Start of Frame
I: Trigger position of the Identifier
R: Trigger position of RTR
D: Trigger position of the Data Frame
E: Trigger position of the Error Frame
•Data frame
Interframe
Space Interframe
Space or
Overload
Frame Recessive
Dominant
DATA FRAME
Start of Frame
(1 bit)
S D
Arbitration Field
(Std: 12 bit)
(Ext: 32 bit) Control Field
(6 bit) Data Field
(0 to 64 bit)
CRC Field
(CRC Sequence 15 bit)
(CRC Delimiter 1 bit)
ACK Field
(ACK Slot 1 bit)
(ACK Delimiter 1 bit)
End of Frame
(7 bit)
2. Setting the Trigger Conditions

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IM 701430-51E
•Remote frame
Inter Frame
Space Recessive
Dominant
REMOTE FRAME
Start of Frame
(1 bit)
S
Arbitration Field
(Std: 12 bit)
(Ext: 32 bit)
Control Field
(6 bit)
CRC Field
(CRC Sequence 15 bit)
(CRC Delimiter 1 bit)
ACK Field
(ACK Slot 1 bit)
(ACK Delimiter 1 bit)
End of Frame
(7 bit)
Interframe
Space or
Overload
Frame
•Standard format and extended format of the data frame and remote frame
S
O
F
R
T
R
I
D
Er
0Recessive
Dominant
SIR
DLC
(4 bit)
Arbitration Field Data Field
Control
Field
11 bit IDENTIFIER
Standard Format
S
O
F
S
R
R
I
D
E
R
T
Rr
0Recessive
Dominant
SIR
DLC
(4 bit)
r
1
Arbitration Field Data Field
Control
Field
11 bit IDENTIFIER 18 bit IDENTIFIER
Extended Format
•Error frame
Recessive
Dominant
E
ERROR FRAMEData
Frame Error Flag
(6 bit)
superposition of Error Flags
(6 to 12 bit)
Error Delimiter
(8 bit)
Interframe
Space or
Overload
Frame
Setting the Identifier Field
•Selecting the condition
Select from the following:
True: Trigger occurs when any of the 4 bit patterns is met.
False: Trigger occurs on a bit pattern other than the four patterns.
•Setting the bit pattern
Four bit patterns can be specified. A trigger is activated on the OR condition (any of
ID1, ID2, ID3, and ID4).
The number of specified bits varies depending on the format type as follows:
Standard format: 11 bits (maximum value is 7FF when set to hexadecimal)
Extended format: 29 bits (maximum value is 1FFFFFFF when set to hexadecimal)
If Identifier is enabled (ON) and all the bits of the ID field is set to X, the trigger does
not occur. The trigger does not occur even when combined with other field and frame
types in this condition. In addition, when X is included in the bit pattern, the trigger
point is set to the end of the Identifier in the same fashion as when 0, 1 is set to the bit
pattern.
2. Setting the Trigger Conditions

6IM 701430-51E
Setting the Data Field (DLC)
•Setting the number of valid bytes
Set the number of valid bytes between 1 and 8. A trigger is activated only on a frame
having a Data Field with the specified number of bytes.
•Selecting the condition
Select the condition from the following four types. Greater and Less can be used only
when the data flows from the highest byte (big endian) on the bus.
True: Trigger is activated when the bit pattern is met.
False: Trigger is activated when the bit pattern is not met.
Greater: Trigger is activated when the value of the data flowing on the bus is greater
than the specified value.
Less: Trigger is activated when the value of the data flowing on the bus is less
than the specified value.
•Setting the bit pattern
Set up to 64 bits.
Hex entry: X, 0 through F, –*
Bin entry: X, 0, 1, –*
If Data Field is enabled (ON) and all the bits of the Data Field is set to X, the trigger
does not occur. The trigger does not occur even when combined with other field and
frame types in this condition. In addition, when X is included in the bit pattern, the
trigger point is set to the end of the Data Field in the same fashion as when 0, 1 is set
to the bit pattern.
*If the number of valid bytes is less than 7, the invalid byte is displayed as “–” and cannot be
changed.
Note
•RTR and Data Field cannot be turned ON simultaneously. If Data Field is turned ON when
RTR is ON, RTR is turned OFF; if RTR is turned ON when Data Field is ON, Data Field is
turned OFF.
•The trigger function of the DL7200 does not support the case when the standard format and
extended format are mixed on the CAN bus. The trigger is not activated correctly in such case.
Setting the Trigger Level
The trigger source is fixed to CH1 for the CAN Bus signal analysis function. Set the
threshold level and coupling of CH1.
Setting the Trigger Level (Level)
Selectable Range: 8 div within the screen
Resolution: 0.01 divisions.
For example, the resolution for 2 mV/div is 0.02 mV.
Setting the Hysteresis (Hys)
Sets a width to the trigger level so that triggers are not activated by small changes in
the trigger signal.
: Approximately 0.3 div* of hysteresis around the trigger level.
: Approximately 1 div* of hysteresis around the trigger level.
*The value above is an approximate value. It is not strictly guaranteed.
Setting the Trigger Coupling
Select the trigger coupling from the following list of choices.
AC: Uses a signal that is obtained by removing the DC component from the trigger
source signal.
DC: Uses the trigger source signal as-is.
2. Setting the Trigger Conditions

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IM 701430-51E
Turn ON/OFF the HF Rejection (HF Rej)
Specify 15 kHz or 20 MHz if you wish to use a signal that is obtained by removing the
high frequency components (frequency components greater than 15 kHz or 20 MHz)
from the trigger source signal as the trigger source.
Setting the Hold Off
See section 6.4, “Setting the Hold Off Time” in the
DL7100/DL7200 User’s Manual
(IM701410-01E) .
Operating Procedure
Setting the Trigger Type
1. Press the “ENHANCED” key.
2. Press the “Type” soft key displays the trigger type selection menu.
3. Press the “CAN Bus” soft key.
Setting the Trigger Pattern
4. Press the “Set Pattern” soft key to display a dialog box for setting the trigger
pattern.
5. Turn the jog shuttle to move the cursor to “Bit Rate.”
6. Press the “SELECT” key.
7. Turn the jog shuttle to select “1M,” “500k,” “250k,” “125k,” “100k,” “83.3k,” “50k,”
or “33.3k.” Press the “SELECT” key to confirm the setting. Pressing the
“RESET” key will reset the value to 500k.
8. Turn the jog shuttle to move the cursor to “Sample Point.”
9. Press the “SELECT” key.
10. Turn the jog shuttle to set the sample point. Press the “SELECT” key to confirm
the setting. Pressing the “RESET” key will reset the value to 62.5.
2. Setting the Trigger Conditions

8IM 701430-51E
11. Turn the jog shuttle to move the cursor to “Message Format.”
12. Press the “SELECT” key to select “Std” or “Ext.”
13. Turn the jog shuttle to move the cursor to Vdiff.
14. Press the “SELECT” key.
15. Turn the jog shuttle to select “CAN_H–CAN_L” or “CAN_L–CAN_H” and press
the “SELECT” key.
16. Turn the jog shuttle to move the cursor to Pattern Format.
17. Press the “SELECT” key to select “Hex” or “Bin”.
Selecting the Field or Frame Type
18. Turn the jog shuttle to move the cursor to the field type or frame type to be used
as a trigger condition. Select the type from “Start of Frame,” “Identifier,” “RTR,”
“Data Field,” and “Error Frame.”
19. Press the “SELECT” key to turn it ON.
When Identifier Is Selected as a Trigger Condition
20. Turn the jog shuttle to move the cursor to “Condition.”
21. Press the “SELECT” key the appropriate number of times to select “True” or
“False.”
22. Turn the jog shuttle to move the cursor to the Identifier (ID1, ID2, ID3, or ID4) on
which to set the bit pattern.
23. Press the “SELECT” key to turn it ON.
24. Turn the jog shuttle to move the cursor to the desired bit and press the
“SELECT” key.
25. If you selected Hex for Pattern Format, turn the jog shuttle to select a value from
“0” to “F” and “X” and press the “SELECT” key. Pressing the “RESET” key will
reset the value to “X.”
If you selected Bin for Pattern Format, press the “SELECT” key the appropriate
number of times to select “0,” “1,” or “X.”
26. Repeat steps 19 to 22 as many times as necessary.
When Data Field Is Selected as a Trigger Condition
27. Turn the jog shuttle to move the cursor to “DLC.”
28. Press the “SELECT” key.
29. Turn the jog shuttle to set the number of valid bytes. Press the “SELECT” key to
confirm the setting. Pressing the “RESET” key will reset the value to 8.
30. Turn the jog shuttle to move the cursor to “Condition.”
31. Press the “SELECT” key.
32. Turn the jog shuttle to select “True,” “False,” “Greater,” or “Less” and press the
“SELECT” key.
33. Turn the jog shuttle to move the cursor to the desired bit.
34. If you selected Hex for Pattern Format, turn the jog shuttle to select a value from
“0” to “F” and “X” and press the “SELECT” key. Pressing the “RESET” key will
reset the value to “X.”
If you selected Bin for Pattern Format, press the “SELECT” key the appropriate
number of times to select “0,” “1,” or “X.”
Note
RTR and Data Field cannot be turned ON simultaneously. If either one is turned ON, the
other is turned OFF.
2. Setting the Trigger Conditions

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IM 701430-51E
Setting the Trigger Level
1. Carry out steps 1 to 3 in “Setting the Trigger Type” on page 7.
2. Press “Level/Coupling” soft key to display a dialog box used to set the trigger
level, hysteresis, coupling, and HF rejection.
Note
CH1 is the only trigger source for the CAN Bus signal analysis function.
Setting the level
3. Turn the jog shuttle to move the cursor to “Level1.”
4. Press the “SELECT” key to display the level selection menu.
5. Turn the jog shuttle to set the level.
You can move between the digits using the arrow keys. Pressing the “RESET”
key resets the trigger level to 0 V.
Setting the Hysteresis
6. Turn the jog shuttle to move the cursor to “Hys.”
7. Press the “SELECT” key to select “ ” or “ .”
Setting the Trigger Coupling
8. Turn the jog shuttle to move the cursor to “Coupling.”
9. Press the “SELECT” key to select “DC” or “AC.”
Setting the HF Rejection
10. Turn the jog shuttle to move the cursor to “HF Rej.”
11. Press the “SELECT” key to select “OFF,” “20MHz,” “15kHz.”
Setting the Hold Off
12. If the jog shuttle control is not set to “Hold Off,” press the “Hold Off” soft key.
13. Turn the jog shuttle to set the hold off time.
You can move between the digits using the arrow keys. Pressing the “RESET”
key resets the hold off time to 0.08us.
2. Setting the Trigger Conditions

10 IM 701430-51E
3. Setting the Cursor
Function Cursor1 and Cursor2 can be moved per each CAN Bus transfer rate (bit rate) while
maintaining a bit rate of space between them. Using this function, you can perform
analysis while counting the number of bits in the CAN Bus waveform.
Bit Rate
You can select the CAN Bus transfer rate from the following values:
1 M, 500 k, 250 k, 125 k, 100 k, 83.3 k, 50 k, 33.3 k (bps)
Cursor Jump
You can move Cursor1 to the front of the specified field (SOF, Identifier, Ctrl, Data, CRC,
ACK), and move Cursor2 one bit rate after Cursor1. You can also move Ref1 to the front
and Ref2 to the back of the specified field.
Note
If you set the cursor type to CAN Bus, immediately after analysis Cursor1 moves to the front
of SOF and Cursor2 moves to the position one bit rate after Cursor1. Also, if you choose
Field Jump (see “Field Jump” on pages 16 and 20 ), Z1Position, Cursor1, and Ref1 move to
the front of the specified field and Ref2 moves to the end of the specified field.
When the Zoom Position Moves to the Identifier Field after Analysis
Cursor1 Cursor2 Ref2
Identifier
Bit Rate SOF
Ref1
Operating Procedure1. Press the Cursor key.
2. Press the Type soft key. The trigger type selection menu appears.
3. Press the CAN Bus soft key.
Cursor1 remains in the same place, and Cursor2 moves to the position one bit
rate after Cursor1. The positions of reference cursors Ref1 and Ref2 remain at
their previous settings.

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IM 701430-51E
Bit Rate
4. If you do not wish to change the bit rate, skip to step 5. To change the bit rate,
press the Bit Rate soft key, and select Bit Rate using the jog shuttle. Turn the
jog shuttle to select one of the following: 1 M, 500 k, 250 k, 125 k, 100 k, 83.3 k,
50 k, or 33.3 k. Cursor2 moves to the position bit rate after Cursor1, using the
changed bit rate.
Note
•The positions of reference cursors Ref1 and Ref2 remain at their previous settings.
•The bit rate reflects the bit rate specified when entering the trigger pattern (see pages 3 and
7) and analyzing the CAN Bus signal (see pages 12 and 16).
Cursor Jump
5. Press the Cursor Jump soft key. The field selection screen appears.
6. Press the SOF, Identifier, Control Field, Data Field, CRC, or ACK soft key.
7. Press the Jump Exec soft key. Cursor1 moves to the front of the field specified
in step 6, and Cursor2 moves to a position after Cursor1 that is separated from it
by the bit rate.
Note
If you press the Jump Exec soft key when there is no data for analysis, an error message
appears.
8. Press the Cursor1/Cursor2 soft key, then turn the jog shuttle to select Cursor1/
Cursor2.
9. Turn the jog shuttle to move Cursor1 and Cursor2. The cursors move while
maintaining a bit rate of space between them.
Note
•When analyzing the CAN bus signal with the trigger type set to Can Bus (see section 4,
“Analysis/Search” in ), Z1Position, Cursor1, and Ref1 move to the front of the SOF field.
Cursor2 moves to a position one bit rate after Cursor1.
•If you choose Field Jump with the cursor type set to CAN Bus (see “Field Jump” on pages 16
and 20 ), Z1Position, Cursor1, and Ref1 move to the front of the specified field, Cursor2
moves to a position one bit rate after Cursor1, and Ref2 moves to the end of the specified
field.
3. Settings the Cursor

12 IM 701430-51E
4. Analyzing and Searching
Function Channels Used with the CAN Bus Signal Analysis Function
CH1: CAN signal input channel. For the procedure in connecting the probe, see
section 1, “Connecting the Probe.”
Math1: For displaying the stuff bit (see section 5, “Performing Stuff Bit Computation”)
after analysis.
Items to Be Analyzed
The frame to be analyzed are the following three types.
Remote Frame
Detects the Identifier value, CRC value, and the presence of Acknowledge.
Data Frame
Detects the Identifier value, Data value, CRC value, and the presence of
Acknowledge.
Error Frame
Detects the Identifier value*, Data value*, CRC value*, the presence of Acknowledge*,
and the error type.
The DL7200 classifies the error types into the following five types.
•Active Error: When 6 or more successive dominant bits appear on the bus.
Error flag (6 dominant bits) output by an error active
(normal) unit and 6 or more successive dominant bits
appear in bit error and stuff error.
•Passive Error: When 6 or more successive recessive bits appear on the bus.
Error flag (6 recessive bits) output by an error passive
(error-prone condition) unit and 6 or more successive
recessive bits appear in bit error and stuff error.
•Form Error: When an illegal format is present in a fixed-format bit field.
Fixed format is as follows:
CRC delimiter is recessive
ACK delimiter is recessive
End of Frame is recessive
In addition, the DL7200 determines Form Error if the
following format is violated.
Reserve bit (r0 or r1) is dominant
DLC is 0 to 8
•CRC Error: When the CRC calculated from the retrieved waveform
data and the retrieved CRC sequence value differ.
•Acknowledge Error: When the ACK slot is recessive.
*If an error is detected in a frame, the analysis on the frame ends at that point, and the next
frame is analyzed. Therefore, the Identifier value, Data value, CRC value, and the presence
of Acknowledge after error detection are not analyzed.
CAN Bus Bit Rate
Set the sample speed of the CAN Bus.
Selectable values: 1 Mbps, 500 k, 250 k, 125 k, 83.3 k, and 33.3 k

13
IM 701430-51E
Sample Point
Specify the sample point within the bit time.
Value: “18.8” “21.9” “25.0” “28.1” “31.3” “34.4” “37.5” “40.6” “43.8” “46.9” “50.0” “53.1”
“56.3” “59.4” “62.5” “65.5” “68.8” “71.9” “75.0” “78.1” “81.3” “84.4” “87.5” “90.6”
(%)
Setting Vdiff
Select the connection method of the differential probe. See section 1, “Connecting the
Probe.”
Select Vdiff from the following two types. In either case, the logical value is recessive = 1
and dominant = 0.
CAN_L–CAN_H: The recessive electric potential is set higher than the dominant
electric potential.
CAN_H–CAN_L: The dominant electric potential is set higher than the recessive
electric potential.
Note
The bit rate and Vdiff settings are synchronized to the trigger condition menu (see section 2,
“Setting the Trigger Conditions”).
Threshold level (Thr Upper/Thr Lower)
To analyze the indefinite data on the signal, specify two signal levels, Thr Upper and Thr
Lower.
By comparing the measured data against the threshold levels, 0, 1, or indefinite data is
determined.
•When Vdiff=CAN_L–CAN_H
When measured data < Thr Lower: 0
When measured data > Thr Upper: 1
When Thr Lower ≤measured data ≤Thr Upper: Indefinite data
•When Vdiff=CAN_H–CAN_L
When measured data < Thr Lower: 1
When measured data > Thr Upper: 0
When Thr Lower ≤measured data ≤Thr Upper: Indefinite data
The indefinite data is presumed to be the same value as the previous bit for the purpose
of displaying the result. In addition, if indefinite data is found, an asterisk is indicated on
the frame that contains the indefinite data in the “list below the screen” and the “detailed
analysis list.”
Setting the Stuff Bit (Stuff Bit Operation)
Math1 can be used to perform stuff bit computation. See section 5, “Performing Stuff Bit
Computation.”
Executing the Analysis (Analyze Exec)
Analysis is performed on 4000 frames before and after the trigger target frame. Analysis
is not performed if there is no Start of Frame on the screen. In addition, if an error is
detected in a frame, the analysis on the frame ends at that point, and the next frame is
analyzed.
4. Analyzing and Searching

14 IM 701430-51E
Analysis Result
The following four items are listed at the bottom of the screen.
No.: Frame type (R: Remote Frame, D: Data Frame, and E: Error Frame)
With the trigger target frame set to 0, the frame is numbered No. –1, No. –2, and
so on before the target frame and No. 1, No. 2, and so on after the target frame.
ID: Displays the value of the ID field using 11-bit (standard) or 29-bit (extended)
hexadecimal value.
Dt: Displays the Data Field value in hexadecimal notation. Displays 8 bits in 1
frame.
ACK:Displays the Acknowledge value (Y if Acknowledge was received, nothing if it
was not). Displays a mark in this column if indefinite data is present within the
frame.
Even if standard format and extended format are mixed, it is automatically detected.
For items that were not analyzed due to an error detection within the frame, blank is
displayed.
Detailed Analysis List (Detail)
Displays the details of the list that is displayed at the bottom of the screen. The following
items are displayed.
Frame type (R: Remote Frame, D: Data Frame, and E: Error Frame)
No. (–4000 to 4000)
The time of Start of Frame from the trigger point: Time (ms)
ID (hexadecimal notation)
Data in the selected format, Hex/Bin*
CRC (hexadecimal notation)
ACK: “Y” if the ACK signal was returned, no display if the signal was not returned.
Error type: Active, Passive, Form, CRC, or ACK (see page 12)
*When the detailed display dialog box is displayed, a soft menu used to select the Data format
is also displayed.
If indefinite data is present, a mark is displayed in the ACK column.
The waveform of the frame that is highlighted in the detailed display is shown in the
Zoom window. After executing the analysis, No. 0 is automatically selected. You can
highlight an arbitrary frame by No. by turning the jog shuttle in the List (Detail) screen.
Note
The contents of the detailed analysis list can be output to a file in ASCII format. See section
6, “Outputting the Analysis Results to a File.”
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Zoom rate (Z1 Mag)
The upper limit of the zoom rate is determined from the display record length as follows:
Display record length divided by 50 (or 40)
The display record length does not necessarily match the record length.
For details on the display record length, see appendix 1, “Relationship between the Time
Axis Setting, Sample Rate and Record Length” in the
DL7100/DL7200 User’s Manual
(IM701410-01E) .
Zoom position (Z1 Position)
The zoom position can be set by specifying the zoom center position (center of the zoom
box) in the range –5 to +5 divisions with the center of the waveform display frame set to
0 divisions. When the record length is 16 Mwords, the zoom position can be set only in
the range in which the edge of the waveform matches the edge of the window. The
selectable steps is as follows:
Selectable steps of zoom position: T/div ×10 ÷display record length
Performing a Pattern Search (Search Setup)
Search the waveform by specifying a field or frame pattern. When a waveform that
matches the pattern is found, the Zoom Box moves to that point and displays the
specified waveform in the Zoom window. Indefinite data can be specified and searched.
Pattern search and indefinite data search cannot be executed simultaneously.
For a pattern search, indefinite data is searched when the value set in the menu is 1 or 0.
Setup Data
Type: Specify the type of data to be searched.
Frame Pattern: Search for field or frame patterns.
Indefinite State: Search for indefinite data.
If you selected Frame Pattern, set the following item.
Message Format: Select whether the ID field is standard or extended.
Std: Standard format (11 bits)
Ext: Extended format (29 bits)
Pattern Format: Specify the pattern display format.
Hex: Hexadecimal notation
Bin: Binary notation
Setting the pattern: Specify multiple patterns from Identifier, RTR, Data Field, ACK,
and Error. Searches for data that matched all the specified
patterns (AND condition).
Executing the search (Next, Previous)
•When Patterns Are Searched
Press the execution key corresponding to the direction in which the search is to be
performed from the current selected frame.
Next: Executes the search on frames that are after the current selected
frame.
Previous: Executes the search on frames that are before the current selected
frame.
•When Indefinite Data Is Searched
Next: Executes the search on data that is after the current Zoom Position.
Previous: Executes the search on data that is before the current Zoom Position.
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16 IM 701430-51E
Displaying the Search Result
•When Indefinite Data Is Searched
The head of the indefinite data is displayed at the Zoom Position.
•When Patterns Are Searched
•When multiple pattern items (Identifier, RTR, Data Field, Ack, and Error) are
selected:
The head of the specified field is displayed at the Zoom Position. If you specify multiple
patterns, the Zoom Position moves to the beginning of the field that was found last in the
time sequence. However, for Identifier and Data field, if the pattern is set to all Xs, it is
equivalent to not specifying a pattern. Thus, search is not performed.
•When all pattern items (Identifier, RTR, Data Field, Ack, and Error) are OFF:
A message “Pattern is not specified” is displayed.
Jumping to a Specified Field (Field Jump)
Moves the Zoom Box to a particular field within the current frame. The applicable fields
are the following five types.
Identifier
Control Field
Data Field
CRC
ACK
The Zoom Box moves to the head of the specified field.
Note
When the memory length is 16 Mwords on a DL7200 16M model, normal operation may not be
possible for frames near the ends of the main screen due to the limitation on the Zoom Position. The
Zoom Position may stick to the selectable boundary value when search or Field Jump is executed.
Operating Procedure
Showing the CAN Bus Signal Analysis Function Screen
1. Press the “SHIFT” key to set the keys in the shifted condition.
Functions marked in purple on the panel become active.
2. Press the “ZOOM” key.
3. Press the “Type” soft key to display the search method selection menu.
4. Press the soft key corresponding to “CAN Bus” to select the search method.
Note
•The item to be analyzed is the history data of CH1.
•When the search type is set to CAN Bus, the display format of the zoomed waveform (see
section 8.8 in IM701410-01E) may change. “Main,” “Z2 Only,” and “Main & Z2” change to
“Main & Z1.”
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Performing the Analysis
5. Press the “Analyze Setup” soft key to display a dialog box for setting the
analysis conditions. Turn the jog shuttle to select the item. Press the “SELECT”
key to display a menu used to set the item or change the selected item.
Setting the Bit Rate
6. Turn the jog shuttle to move the cursor to “Bit Rate” and press the “SELECT” key.
7. Turn the jog shuttle to select “1M,” “500k,” “250k,” “125k,” “100k,” “83.3k,” “50k,”
or “33.3k” and press the “SELECT” key. Pressing the “RESET” key will reset
the value to 500k.
Setting the Sample Point
8. Turn the jog shuttle to move the cursor to “Sample Point” and press the
“SELECT” key.
9. Turn the jog shuttle to select which point within 1 bit to be sampled and press the
“SELECT” key. Pressing the “RESET” key will reset the value to 62.5.
Setting Vdiff
10. Turn the jog shuttle to move the cursor to “Vdiff” and press the “SELECT” key.
11. Turn the jog shuttle to select “CAN_H - CAN_L” or “CAN_L - CAN_H” and press
the “SELECT” key.
Setting Thr Upper
12. Turn the jog shuttle to set the level used to judge High and press the “SELECT”
key. You can move between the digits using the arrow keys.
Pressing the “RESET” key resets the level to 0 V.
Setting Thr Lower
13. Turn the jog shuttle to set the level used to judge Low and press the “SELECT”
key. You can move between the digits using the arrow keys.
Pressing the “RESET” key resets the level to 0 V.
Setting the Stuff Bit
See section 5, “Performing Stuff Bit Computation.”
4. Analyzing and Searching