D1256/D1257
Overview
D1256/D1257 Installation Instructions
© 2004 Bosch Security Systems
Page 7
74-06925-000-H
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
•
D9112B1
•
D7212, D7212G
•
D7412, D7412G
•
D9112
•
D9412, D9412G
•
D9124 (using the D9112LTB)
•
D9124 (using the D9112LTB-EX or D9412GLTB)
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
Item
Description
1
Vacuum florescent display
2 Mounting
hole
3 Speaker
for
sounder
4
Wiring harness connector
5
Address DIP switches
6 Speaker
volume
control
(potentiometer)
7 Keypad
(arrangement is different for
D1256 and D1257)
1
2
3
4
5
6
1
7
2
2
2
3
4
2
5
6
Table 3: Key to Figure 1
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.
