SECTION
1
SYSTEM OVERVIEW
INTRODUCTION TO NETWORKING
The Simplex 4120 Network is a system of individual Fire Alarm Control Panels communicating on a loop as a peer-
to-peer network. This means that every network panel has an equal chance of putting a message out on the network.
Each panel with direct communications into the 4120 Network is defined as a “Node”. Each node can maintain the
status and control of its own dedicated circuit points while monitoring and controlling activity at other locations.
The communications scheme used by the network is based on Token Ring Communications Protocol. In Token Ring
communications, an electronic data “flag” or “token” is passed from one node to the next. The node that holds the
token is the only one permitted to talk on the network. A node that has no messages or requests for the network
simply passes the token onto the next node. Thus, every node has an equal chance of putting a message out on
the network when needed.
A 4120 Network Node can be any of the following:
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4120-8001 Fire Alarm Control Panel
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4120-8201 Voice Fire Alarm Control Panel
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4120-8010 Miniplex Control Panel
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4120-8210 Voice Miniplex Control Panel
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4120-8511 Universal Transponder (UT)
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4120-8601 Voice UT
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4120-8602 UT Status Command Center (Voice Modules optional)
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4120-8801 2500-Point Network Display Unit (2500 NDU)
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4120-8821 2500 NDU with Command Center.
The following two additional 4120-series panels are available as “sub-panels” to the system nodes:
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4120-8019 Miniplex Transponder (for Miniplex Nodes only)
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4120-8009 Remote Annunciator Panel.
An existing 4100 Fire Alarm Control Panel or Universal Transponder can also be included in the network by installing
the after-market 4120-0140 RS-485 Network Interface Card into a panel slot in the existing unit and configuring the
panel to accept the card.
41 OO-family panels compatible with the 4120-0140 Network Interface Card are:
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4100-8001 Fire Alarm Control Panel
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4100-8201 Voice Fire Alarm Control Panel .
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4100-8010 Miniplex Control Panel
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4100-8210 Voice Miniplex Control Panel
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4100-8511 Universal Transponder
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4100-8601 Voice Universal Transponder
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4100-8602 UT Voice Status Command Center.
Network information is sequentially transmitted from one node to another. At each node, the network message is
captured and either retransmitted as received, or modified before retransmission to provide the network with a status
update. The ability of the message to circulate through the network defines network status and allows the nodes to
respond accordingly.
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