To read data from the CAN bus, the CAN interface must be enabled. For the initial connection, it is also recommended to use Passive mode.
All required settings are configured on the CAN Bus tab in the device configuration.
¶ Description
- Connect the device to the CAN bus and open CAN Spy.
- In the Source list, select the CAN interface of the connected device.
- Click Auto Detect to automatically detect the CAN bus Baudrate.
Please wait... The program checks the supported baud rates from highest to lowest until CAN traffic is detected.
- Once the Baudrate has been detected, all unique CAN messages captured on the bus will appear in the Messages table. The detected baud rate will be displayed in the Baudrate list. The information panel at the top of the window will also display the identifier type used on the bus.
¶ Animation
The process described above is demonstrated in the animation below.
¶ Recommendations
If the Baudrate has been detected, the CAN bus connection has been established successfully.
If the Baudrate has been detected, but only a few messages are displayed (approximately 5 or fewer):
- Most likely this CAN bus contains little or no useful data.
Try another CAN bus connection point.
If the Baudrate has NOT been detected:
-
The CAN H and CAN L wires may be swapped.
Reconnect the wires, swapping CAN H and CAN L. -
The bus may be using an unsupported baud rate.
Try selecting the Baudrate manually, then click Start. -
The selected twisted pair is not a CAN bus.
Try another connection point.