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Serial bus analysis
R&S
®
RTA4000
289
User Manual 1335.7898.02 ─ 08
To trigger on CAN signals:
1. Press the [Protocol] key in the Analysis area of the front panel.
2. Select the bus that is configured for CAN.
3. Select "Trigger".
This selection has several effects:
● Enables decoding, if necessary.
● Sets the "Trigger Type" to "Serial Bus" and the trigger source to the selected
bus.
● Displays the "CAN Trigger" condition in the dialog box, below the protocol
setup.
4. At "CAN Trigger", select the required trigger type:
● "Start of Frame": first edge of synchronization bit
● "End of Frame": frame number in a data stream
● "Frame": error, overload, data or remote frame
● "Error": stuff bit, form, acknowledgment, CRC
● "Identifier": specific message identifier or identifier range
● "Identifier and Data": combination of identifier and data condition
5. If "Identifier" or "Identifier and Data" is selected, the CAN trigger setup dialog
expands to define the serial pattern.
CAN trigger settings
Figure 13-23: Trigger setup dialog with an example of CAN identifier and data patterns
"CAN Trigger" = trigger on "Identifier and Data"
"Identifier"
= trigger on 29-bit identifiers greater than the specified identifier
"Data"
= trigger on the specified 6-byte data pattern
0 (blue)
= Selected nibble in the 2
nd
byte of the data pattern, where the blue color indicates that the
keypad is active for this nibble
CAN Trigger
Selects the trigger mode.
"Start of
Frame"
Triggers on the first edge of the dominant SOF bit (synchronization
bit).
CAN (option R&S
RTA-K3)