Johnson Controls Metasys Intelligent Fire Network Technical Manual page 17

Table 5: Performance Comparison of Style 7 and Style 4
Feature
Single Break or Short
Media Type
Connection Type
Changes to IFC Panel
Programming?
Changes to Software?
For additional information regarding Style 4 and Style 7 wiring styles,
refer to the Performance and Capacities of Signaling Line Circuits section
of the NFPA 72, National Fire Alarm Code.
Style 7
Communication continues to
all nodes on the network.
Wire, fiber optic, or
wire/fiber optic combination
Point-to-point only
Need to system program at
panel. (See the IFC Panel
System Programming for
Style 7 FN in the
Commissioning and
Troubleshooting Procedures
section of this document.)
Need to change
METASYS.INI file either on
installation or in text editor.
(See the Style 7 Operation
section of this document.)
IFC Networking—Metasys Intelligent Fire Network
Style 4
Communication loss
Wire, fiber optic, or
wire/fiber optic combination
Bus or point-to-point
No changes needed; Style 4
is default.
No changes needed; Style 4
is default.
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