InteliPro, SW version 1.4,
©
ComAp
–
April 2014
InteliPro 1.4 Comprehensive Guide - rev. 1
3-4
CAN
BUS TOPOLOGY
N
OTE
:
for information about CAN bus, specifications etc.
Recommended CAN/RS485 connection
CAN bus connection
The bus has to be terminated by 120 Ohm resistors at both ends. External units can be connected on
the CAN bus line in any order, but keeping line arrangement (no tails, no star) is necessary. Standard
maximum bus length is 200m for 32C CAN BUS MODE and 900m for 8C CAN BUS MODE. Shielded
cable must be used, shielding has to be connected to PE on one side (controller side).
1. For shorter distances (all network components within one room)
–
picture 1
Interconnect H and L; shielding connect to PE on controller side
2. For longer distances (connection between rooms within one building)
–
picture 2
Interconnect H, L, COM; shielding connect to PE in one point
3. In case of surge hazard (connection out of building in case of storm etc.)
–
picture 3
We recommend to use following protections:
