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Chapter 5 To Trigger the Oscilloscope RIGOL
DS8000-R User Guide 5-43
âš« Frame: triggers on the frame of FlexRay bus.
➢ Click Frame to select the frame type. The types of frames include null, Sync,
Start, and All.
➢ Click More → Define to select "ID" or "Cyc Count".
When you select "ID", set the following parameters: ID Comp, ID Min, and
ID Max. Click More → ID Comp to select the comparison conditions. The
available choices include =, ≠, >, <, ><, <>. Click More → ID Max or
click More → ID Min, then use the pop-up numeric keypad or scroll with
the mouse to set the frame ID.
When you select "Cyc Count", set the following parameters: Cyc Comp,
Count Min, and Count Max. Click More → Cyc Comp to select the
comparison conditions. The available choices include =, ≠, >, <, ><, <>.
Click More → Count Max or click More → Count Min, then use the
pop-up numeric keypad or scroll with the mouse to set the cycle count.
âš« Symbol: triggers on the CAS/MTS (Collision Avoidance Symbol/Media Access
Test Symbol) and WUS (Wake Up Symbol) of FlexRay bus.
➢ Click Symbol to select the symbol type. The symbol type includes CAS/MTS
and WUS.
➢ Click More → ID Comp to select the comparison conditions. The available
choices include =, ≠, >, <, ><, <>. Click More → ID Max or click More
→ ID Min, then use the pop-up numeric keypad or scroll with the mouse to
set the frame ID.
âš« Error: triggers when an error occurs to the FlexRay bus.
Click Error to select the error type. It includes Head CRC Err, Tail CRC Err,
Decode Err, and Random Err.
Note: As the occurrence possibility of specified FlaxRay frame is very low, it is
recommended that you set the oscilloscope to "Normal" trigger mode when the
trigger condition is set to "Frame", so as to prevent the instrument from triggering
automatically while waiting for the specified frame. The same goes for "Error" trigger
condition. In addition, when multiple FlexRay errors occur at the same time, you
need to adjust the trigger holdoff so as to view the specific error.
Trigger Mode:
For details, refer to descriptions in "Trigger Mode".
Trigger Parameter Setting:
Set the trigger parameter (noise rejection) under this trigger type. For details, refer
to descriptions in "Noise Rejection".
Trigger Level:
Refer to "Trigger Level". The current trigger level value is displayed at the
upper-right corner of the screen.
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