Parker PSVG-IQAN-C2E1M2W1U1, Руководство пользователя

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28 PSVG-IQAN-C2E1M2W1U1
Communication
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 17: J1939 CAN connection