Specifications

4
EST3
EST3
Network
SUBMIT



Network
Local Rail Modules
Local Rail Modules (LRMs) conveniently mount to the EST3 inner chassis, away from
high voltages. Each module features removable terminal blocks and simple plug-in
connectors. LRMs include Zoned Amplifiers, Signature Loop Controllers, Conventional
Hardwired Modules, Off Premise Signaling Modules, as well as the main CPU module.
Control Display Modules can be mounted on any LRM.
Signature Detectors and Bases, p. 26; Signature I/O Modules, p. 28; Signature Pull Stations, p. 34
Local Rail
Module
Removable
Terminal Blocks
Local Rail
Signature Driver Controller Modules
The 3-SSDC1 and 3-SDDC1 Signature Driver Controller modules provide an
intelligent interface between the 3-CPU(1.3) module and Signature Series
devices. Each module contains its own microprocessor used to coordinate,
process and interpret information received from and sent to Signature de-
vices. Power and communications is received directly from the control panel
rail assembly. The 3-SSDC1 Single Signature Driver Controller module sup-
ports one Signature Data circuit, while the 3-SDDC1 Signature Dual Driver
Controller module supports two Signature circuits. Both modules occupy
one rail space in the fire alarm control cabinet and provide removable field
wiring terminals to aid installation.
Innovative design gives the 3-SSDC1/3-SDDC1 and Signature devices truly
“distributed intelligence”. Signature detectors and modules have their own
on-board microprocessor communicating with the loop controller in a fully
digital communication format. This increases the accuracy of the informa-
tion coming to and from the loop controller by reducing the effects of ca-
pacitance and noise.
With decentralized intelligence much of the decision making moves from
the loop controller to the devices. Advanced fire detection algorithms proc-
essed within the Signature devices effectively end unwanted alarms. Envi-
ronmental compensation and multiple sensing element decision making
operations are resident in the devices. Intelligent devices allow the Signa-
ture Controllers to execute communication and system functions with greater
speed and low baud rates, increasing the accuracy of information transmit-
ted between the loop controller and devices.
To enhance survivability of the system the 3-SSDC1/3-SDDC1 supports a
standalone mode for Signature devices. Two catastrophic failure modes are
supported. If the 3-CPU(1/3) fails, the loop controller will continue to poll its
devices. If an alarm is detected it will be sent on the local rail communica-
tion bus and received by other local rail modules. A common alarm condi-
tion throughout the panel will result. If the local rail module (3-SSDC1/3-
SDDC1) fails, and a device (smoke or module) detects an alarm, specialized
circuitry will make the node aware of the alarm condition. The 3-CPU(1/3)
will communicate the alarm condition to the rest of the network. Having
multiple redundant modes is paramount in a life safety system.
3-SSDC1 Single Signature Driver Controller, c/w one 3-SDC1 Catalog Sheet: 85010-0129
3-SDDC1 Dual Signature Driver Controller, c/w two 3-SDC1s Catalog Sheet: 85010-0129
3-SDC1 Signature Device Card - upgrades a 3-SSDC1 to a 3-SDDC1 Catalog Sheet: 85010-0129
3-SSDC1-MB Driver Controller Motherboard (no 3-SDC1 device cards) Catalog Sheet: 85010-0129
TB1
3-SDDC1
SIGNATURE
DRIVER
CONTROLLER
MODULE
DUAL
TB2
Class A Configuration Shown (Typical)
Class A Configuration Shown (Typical)
Circuit #1
To TB1 on 3-SDDC1 Module
SDC #1 Smoke
Power
1 2435678910
+
+
Circuit #2
To TB2 on 3-SDDC1 Module
SDC #2 Smoke
Power
1 2435678910
+
+