This article describes what the maximum length of a stub line in the CAN network is.
APPLICABLE PRODUCTS
CAN interface board, CANbridge, CAN-Repeater
QUESTION
What is the maximum length of a stub line in my CAN network?
ANSWER
The maximum length of a stub line depends on the used CAN bit rate. Lower bit rates allow to work with longer stub lines.
| CAN baud rate (kBd) |
Max. stub line length |
Cumulative stub line length |
Max. CAN bus length |
| 125 | 20 | 100 | 620 |
| 250 | 10 | 50 | 280 |
| 500 | 5 | 25 | 110 |
| 1000 | 2 | 10 | 40 |
Using the CAN-Repeaters the maximum CAN bus length is the line length between the two devices with the largest distance between each other. The biggest problem of the longer stubs are reflections which can distort or destroy CAN messages.