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3.0
Overview
3.1
D1256/D1257 Features
The D1256 Fire Command Center and the D1257 Fire Alarm Annunicator are 4-wire serial devices used with the
following Bosch Security Systems control panels:
•
D7212B1
•
D7212, D7212G
•
D9112
•
D9124 (using the D9112LTB)
Each control panel listed here supervises up to eight command centers/annunicators. You can connect a total of 32
command centers/annunicators to the system. The number of supervised command centers/annunicators, number of
areas, and the available power affect the total number of command centers/annunicators you can connect to the system.
3.1.1
D1256
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.
3.1.2
D1257
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.
3.2
Description
1
2
3
4
Figure 1: D1256/D1257 Internal Arrangement
3.2.1
Display
Both the D1256 and D1257 use a 16-character English language display with custom programmable text. The custom text
programmed at the control panel appears in the LED display (see #1, Figure 1).
They display the latest status conditions of the fire system using words, numbers, and symbols. When an alarm occurs, it
is displayed until the user acknowledges the event at a command center. When a series of events affecting the system
occur, each event displays in order of its priority.
3.2.2
Audible Tones
Both the D1256 and D1257 have a built-in speaker that produces several distinct warning tones. The speaker volume can
be changed by adjusting the potentiometer (see Figure 1). Turn the potentiometer clockwise to increase and
counterclockwise to decrease the volume. You cannot connect external annunciation devices to the annunciators.
© 2004 Bosch Security Systems
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6
2
D1256/D1257 Installation Instructions
D9112B1
D7412, D7412G
D9412, D9412G
D9124 (using the D9112LTB-EX or D9412GLTB)
Item
1
2
3
4
5
6
7
2
Page 7
D1256/D1257
Overview
Description
Vacuum florescent display
Mounting hole
Speaker for sounder
Wiring harness connector
Address DIP switches
Speaker volume control
(potentiometer)
Keypad
(arrangement is different for
D1256 and D1257)
Table 3: Key to Figure 1
74-06925-000-H
- Quick Links:
- Table 4: Switch Address Settings
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