Johnson Controls Metasys Intelligent Fire Network Technical Manual page 18

18 IFC Networking—Metasys Intelligent Fire Network
Style 7 Operation
Under Style 7 operation, a single open, single wire-to-wire short, single
wire-to-wire short and open, single wire-to-wire short and ground, or
single open and ground will not affect the system's ability to receive an
alarm condition and transmit the condition across the FN to all nodes. The
ability to receive alarms will continue with a single occurrence of any of
the above situations, while the system displays a trouble condition. A
single ground does not affect communication, but can be detected and
reported as a trouble.
For Style 7, all network nodes must be connected point-to-point to form a
loop.
If you decide to use Style 7, you will need to do the following software
programming changes:
1. In the OWS METASYS.INI file, change the default Style 4 parameter
to Style 7. You may do this either during software installation or in a
text-editing tool after installation. See the Fire Operator Workstation
(Fire OWS) Technical Bulletin (LIT-636014) for details.
2. In all IFC panels that are connected to the Style 7 FN, manually change
the default from Style 4 to Style 7. To do so, follow the steps in the
IFC Panel System Programming for Style 7 FN section of this
technical bulletin.
Note: This is not the programming of the Style wiring used for the
IFC panel's SLC connecting the addressable devices to the panel.
3. Use NCSETUP for Windows  95 and Windows 98 to change the
Fire-Net NCM to Style 7. See the FN Configuration section of the
NCSETUP for Windows Technical Bulletin (LIT-6360251d) located in
the Metasys Network Technical Manual (FAN 636).
4. Change the INAs programming to Style 7. See the Partial System
Programming section of the Intelligent Network Annunciator (INA)
Technical Bulletin (LIT-448193) located in the IFC-1010/2020
Technical Manual (FAN 448).