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ADCP-75-169 • Issue 1 • June 2004
Page 18
© 2004, ADC Telecommunications, Inc.
4.9 Controller Area Network Connections
Controller area Network (CAN) interface connections between multiple HU’s are supported by
a pair of RJ-45 jacks. One of the jacks is designated as the NET IN port and the other jack is
designated as the NET OUT port. The CAN interface allows up to 24 HU’s to be connected
together (in daisy-chain fashion) and controlled through a single Digivance EMS computer. A
one meter long cable is available (accessory) for CAN connections. Use the following
procedure to connect CAN interface cables between multiple HU’s:
1. Connect one end of the CAN interface cable (accessory) to either the NET IN or NET
OUT port on HU #1 as shown in Figure 16.
2. Route the CAN interface cable to HU #2 and connect the cable’s free end to the port that is
the logical opposite of the CAN interface connection at HU #1.
3. If a third HU will be connected to the network, connect a second CAN interface cable to
the remaining network port on HU #2.
Figure 16. Controller Area Network Connections
4. Route the second CAN interface cable to HU #3 and connect the cable’s free end to the
port that is the logical opposite of the CAN interface connection at HU #2.
5. Repeat steps 3 and 4 for each additional HU that is added to the network up to a total of 24
HU’s. A diagram of typical CAN interface connections is shown in Figure 17.
Note: Connect OUT to IN and IN to OUT. If connected to a NET OUT port at HU #1,
connect to the NET IN port at HU #2. If connected to a NET IN port at HU #1, connect to
a NET OUT port at HU #2.
17869-B
RJ-45 CONNECTOR
DETAIL
NET IN
NET OUT