21
IM 701430-51E
5.
Performing Stuff Bit Computation
Function
Detects stuff bits from the CAN Bus signal waveform and displays them as a Math
waveform.
1 2 3 4 5
6
1 2 3 4 5
6
Low
High
Signal flowing on the bus
(CH1 input)
Stuff bit computation waveform (Math1)
Stuff bit: High level
Other: Low
level
Stuff bits
Set whether to perform stuff bit computation along with the execution the analysis in the
dialog box used to set the analysis conditions (see “Performing the Analysis” on page
17).
OFF: Not perform the computation.
ON: Performs the computation.
Scaling is fixed to
±
2.0.
Stuff bit: High level (+1.0)
Other than stuff bits: Low level (0.0)
Note
Stuff bit computation cannot be performed for the following record lengths.
701440 (DL7200 16M/CH model) : When interleave mode is OFF: 8 Mwords
: When interleave mode is ON: 16 Mwords
If you attempt to execute the analysis with the stuff bit turned ON in the above cases, error
851 “Computation cannot be carried out at the current record length” is displayed.
Operating Procedure
1.
Switch to the “Analyze Setup” screen (see steps 1 to 5 in section 4, “Analyzing
and Searching”).
2.
Turn the jog shuttle to move the cursor to “Stuff Bit Operation.”
3.
Press the “SELECT” key the appropriate number of times to select OFF or ON.
4.
If you press the “Analyze Exec” key when stuff bit computation is ON,
computation is executed. The computation result is displayed in Math1.
