2-15
IM 701450-51E
CAN Bus Signal Analysis Function
2
When Data Field Is Selected for the Frame/Field Type
• The Number of Valid Bytes: DLC
You can set the number of valid bytes in the range from 1 to 8. Only the frames
having a data field of the specified number of valid bytes can activate triggers.
• Condition
Select the from the following four types.
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.
Note
Greater and Less can be used only when the data flows from the highest byte (big endian) on
the bus.
• Bit Pattern: #1 to #8
The Data field pattern can be set with up to 64 bits.
The numbers/characters set varies depending on the pattern format type as follows:
Hex (hexadecimal):
X, 0 to 9, A to F, -* (in units of 4 bits)
Bin (binary):
X, 0, 1, -*
*
If the number of valid bytes is less than 7, the invalid byte is displayed as “-” and cannot be
changed.
Note
•
If Data Field is selected (ON) and all the Data Field bits are 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.
•
When X is included in the Data Field bit pattern, the trigger point is set to the end position
of the Data Field in the same fashion as when 0, 1 is set to the bit pattern.
Notes When Setting the Field or Frame Type
• RTR and Data Field cannot be turned ON simultaneously.
If Data Field is selected when RTR is selected, the RTR selection is cancelled; if RTR
is selected when Data Field is selected, the Data Field selection is cancelled.
• The trigger function does not support CAN Busses with mixed standard and extended
formats. If two formats exist, triggers will not activate correctly.
2.4 Setting CAN Bus Signal Acquisition Conditions
