If a node goes off-line, its network interface module will bypass that connection until the node is back on-line. If the
wires between nodes short, open, or have any other form of communication problem, the network will isollate that
section of wiring. A node that cannot retransmit a message to the next node will transmit back to the previous node
to maintain communications and to notify the network of the node status.
In the event of multiple wiring problems, the remaining nodes will effectively “regroup” and establish new, smaller
“sub-networks” that will maintain communications among the active nodes.
SYSTEM INTRODUCTION
2500 NETWORK DISPLAY UNIT (4120-8801)
The Simplex 2500 Network Display Unit (NDU) is a network annunciator and manual system/point controller for a
4120 Network. The NDU provides alphanumeric annunciation for up to 2,500 network points and/or point lists and
can be programmed to function as the network master controller for Silence, Acknowledge, and System Reset.
Standard features include an alphanumeric display exactly like the 4100 Fire Alarm Control Panel, a SPDT Trouble
Relay, City Connect Circuitry, and more memory to achieve 2,500 point capacity.
The increased memory size provides 600 alarm and 600 trouble event history logs, twice the size of any other 4120
or 4100 model. The 2500 NDU can drive up to 31 serial LCD Annunciators on one optional Remote Unit Interface
(RUI) card. In addition, the NDU can have up to five RS-232 ports for printers and CRT/Keyboards.
2500 NDU WITH STATUS COMMAND CENTER (4120-8821)
The 2500 NDU with Status Command Center combines the 2500 NDU with a custom selection of modular I-IED and/
or LED and control switch assemblies that provide a dedicated monitor and control interface. Voice modules are
available with this model to configure this panel into a Voice Command Center.
The NDU with Status Command Center is actually two nodes in one cabinet assembly. The NDU occupies the top
bay of the unit and the Command Center occupies the rest.
Unlike 4100 panels where there are two Product I.D. types, one for Voice and Non-Voice packages, the 4’120-8821
NDU can be either configuration. As with the standard 2500 NDU package, both models can be COnfigured for
redundant or remote command center applications.
SYSTEM OPERATING DESCRIPTION
NOTE:
This document covers the operating procedures for a typical 2500 NDU. Applications will vary due to
custom programming and local code requirements.
An alphanumeric display on the 2500 NDU Operator Interface Panel (Figure 1) indicates the condition of the system.
The alphanumeric display shows the various labels
and
prompts which guide the user through a sequenced
operation for each abnormal condition.
2
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