User Guide
25
Communication
The CAN cable is very susceptible to system noise; therefore, CAN
shield must be connected as follows:
a. Connect CAN Shield to the point of least electrical noise on the
CAN bus.
b. Connect CAN Shield as close to the center of the CAN bus as
possible.
c. Use the lowest impedance connection possible.
Note: Ground loops can damage electronic modules. The CAN
Shield can only be grounded to one point on the network. If
grounded to multiple points, a ground loop may occur.
CAN Stubs: The CAN stubs cannot be longer than 1 meter, and each
stub should vary in length to eliminate bus reflections and ensure
proper idle state voltage levels.
Max Number of Modules in a System: The CAN bus can handle a
maximum of 30 modules in a system at one time.
The following shows a typical CAN connection using the SAE J1939
standard:
120 ohm
Terminator
120 ohm
Terminator
Node
Node
Node
Node
Node
T connectors
Variable length
CAN stub (<1m)
CAN Network Backbone
(less than 40 meters long)
Figure 16: J1939 CAN connection
Summary of Contents for PSVG-IQAN-C2E1M1W1U1
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