DeviceNet topology

CAN is a 2-wire bus system, to which all participating devices are connected in parallel (i.e. using short drop lines). The bus must be terminated at each end with a 120 (or 121) Ohm termination resistor to prevent reflections. This is also necessary even if the cable lengths are very short!

Since the CAN signals are represented on the bus as the difference between the two levels, the CAN line is comparatively not very sensitive to incoming interference (EMI). Both lines are affected, so the interference has very little effect on the difference level.