PCAN-USB – User Manual
13
Attention!
Risk of short circuit!
If the option described in this
section is activated, you may only connect or disconnect CAN
cables or peripheral systems (e.g. external bus converters) to or
from the PCAN-USB adapter while it is de-energized (the
adapter is not connected to the computer). Consider that some
computers still supply the USB ports with power even when
they are turned off (standby operation).
3.3
Cabling
3.3.1
Termination
A High-speed CAN bus (ISO 11898-2) must be terminated on both
ends with 120 Ohms. Otherwise, there are interfering signal
reflections and the transceivers of the connected CAN nodes (CAN
interface, control device) will not work.
The PCAN-USB adapter does not have an internal termination. Use
the adapter on a terminated CAN bus.
3.3.2
Example of a Connection
Figure 4: Simple CAN connection
In this example, the PCAN-USB adapter is connected with a control
unit by a cable that is terminated at both ends.
