Specifications

D1256/D1257

Overview

D1256/D1257 Installation Instructions

2.0 Overview

2.1 D1256/D1257 Differences

2.1.1 D1256

The D1256 Fire Command Center is a four-wire serial device used with the following Radionics

Control/Communicators:

• D7212B • D9112B

• D7212 • D7412

• D9112 • D9412

• D9124 (that uses the D9112LTB), and • D9124 (that uses the D9112LTB-EX)

Each panel listed here supervise up to eight command centers. You can connect a total of 32 command centers

to the system. The number of supervised command centers, number of areas, and the available power affect

the total number of command centers you can connect to the system.

The D1256 provides annunciation as well as system control.

Four function keys on the D1256 provide quick execution of alarm silencing, trouble silencing, annunciator

display reset, and sensor reset functions.

2.1.2 D1257

The D1257 Fire Alarm Annunciator is also a four-wire serial device used with the following Radionics

Control/Communicators:

• D7212B • D9112B

• D7212 • D7412

• D9112 • D9412

• D9124 (that uses the D9112LTB), and • D9124 (that uses the D9112LTB-EX)

Each panel listed here supervise up to eight command centers. You can connect a total of 32 command centers

to the system. The number of supervised command centers, number of areas, and the available power affect

the total number of command centers you can connect to the system.

The D1257 provides remote annunciation without system control capability. It is well suited for use in locations

where the public may have access to it.

Two keys on the D1257 allow the user to step forward or backward through a list of system events.

2.2 Description

Figure 1: D1256/D1257 Internal Arrangement