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Networking
P/N 06-237058-001
5-3
February 2012
5-2
COMMUNICATIONS
Each networked control unit can communicate with every other control unit in the network. Control
unit communication is peer-to-peer via a token-passing protocol. This method ensures that only one
control unit is broadcasting at any one time. Network Interface Cards (NICs) integrate two or more
control units in a networked configuration.
Networked control units are interconnected using shielded, twisted-wire pair, fiber-optic medium, or
mixed transmission media (combination of fiber optic or twisted pair of wires). The network
structure supports up to 4,000 feet distance between nodes when twisted pair wiring is used; up to
12 miles distance between nodes when single mode fiber-optic cables are used and up to 1 mile when
multi-mode fiber-optic cables are used.
Network messages and broadcasts are transmitted over either single- or dual-channel
communications connections. Dual-channel connections offer a redundant communications path
that allows network broadcasting and inter-control-unit functionality with an open- or short-circuit
fault or ground fault on one of the channels. Any fault in either a single- or dual-channel
communications channel creates a network trouble condition.
5-3
NETWORK EVENT BROADCASTS
Each networked control unit can be configured to broadcast any event associated with its initiating
devices or monitored output circuits:
•
Locally to the control unit-of-origin only
•
Selectively to a subset of networked control units
•
Globally to every control unit within the network.
Network broadcasts extend to all ancillary equipment such as Remote Display Control Modules
(RDCMs), LED Annunciator Modules (LAMs), and Annunciator Terminal Modules (ATMs) associated
with a designated subset of control units when selective event broadcasting is chosen. Network
broadcasts extend to all such equipment associated with every control unit when the network is
configured for global-event broadcasting.
The default operation for event broadcast is globally to all control units in the network.
5-4
OPERATOR CONTROL
Operators can acknowledge events, silence notification appliances, and perform resets in three
different configurations:
•
Locally to the control unit-of-origin only
•
Selectively to a subset of the networked control units
•
Globally to all control units in the network.
Operator-intervention capability extends to all ancillary equipment such as Remote Display Control
Modules (RDCMs), LED Annunciator Modules (LAMs), and Annunciator Terminal Modules (ATMs)
associated with a designated subset of control units when selective operator control is used. It
extends to all such equipment associated with every control unit when the network is configured for
global operator control.
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