Johnson Controls FIRE-MON-17, Technical Manual

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IFC Networking—Metasys Intelligent Fire Network 33
Point-to-Point Configuration
A point-to-point wiring segment (refer to Figure 9) is defined as a twisted
pair link with only two nodes/repeaters attached to it at the ends.
Terminating resistors are required at each end of every twisted pair wire
segment and are built into each MIB/MIB-OWS and repeater. Data is
isolated and regenerated at each node/repeater so a fault at one node is less
likely to bring down the balance of the system.
Note: Point-to-point configuration is optional in a Style 4 FN, but it is a
requirement of Style 7.
If a network employs point-to-point wiring only, a separate pair of wires
must be run between each node/repeater port.
Network Node
Node 1
A B
Ports
Network Node
Node 2
A B
Ports
Network Node
Node 3
A B
Ports
Network Node
Node 4
A B
Ports
Network Node
Node 5
A B
Ports
wire1
Network Node
Node 6
A B
Ports
Add this wire and keep
the two terminating
resistors ( ) for a
Style 7 system.
Figure 10: Wiring an Entire NFPA Style 4 or Style 7
System Point-to-Point