6
IM 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
