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Guide | 2.0 Overview
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Bosch Security Systems B.V. | 2020.03 | F01U011791-03 5
2.2.2 Audible Tones
The D1255RB, D1256RB and D1257RB have a
built-in speaker that produces several distinct
warning tones. To change the speaker volume,
adjust the potentiometer (Figure 1, Item 3). Turn
the potentiometer clockwise to increase and
counterclockwise to decrease the volume.
You cannot connect external
annunciation devices to the
D1255RB, D1256RB, and D1257RB.
• Fire Signal – Pulsed, high pitched bell tone
when the system is in alarm
• Invalid Key Buzz – Flat buzz tone when an
invalid key, or sequence of keys, is pressed
• Keypad Encoding Tone – Muted beep tone
as each key is pressed to indicate that the
entry has been accepted. To disable the
keypad encoding tone, refer to Section 2.2.3
Switch Settings.
• Trouble Buzzer – Two-tone warble when a
trouble event occurs, such as a service alert.
To stop the signal on a D1255RB Keypad,
press [COMMAND][4]. To stop the tone on a
D1256RB, press the [TROUBLE SILENCE]
key.
Figure 1: D1255RB, D1256RB, and D1257RB Internal Arrangement
1 - Vacuum fluorescent display (VFD)
2 - Keypad
3 - Speaker volume control (potentiometer)
4- Address DIP switches
5 - Status LEDs
6 - Wiring harness connector
7 - Speaker for sounder
The D1257RB does not have a
manual method of stopping the
trouble buzzer.
Refer to the Fire System User’s Guide
(P/N: F01U011793) for information about
silencing the signals.
Lost Communication – Single trouble tone
followed by a 30-second silence when a keypad
or annunciator loses communication from the
control panel.
• To stop the tone, restore communication or
remove power from the keypad or
annunciator.
2.2.3 Switch Settings
A 6-position DIP switch (Figure 1, Item 4)
located under the cover allows you to select the
address of each keypad or annunciator and
silence the keypad encoding tones.
For information on accessing the switches, refer
to Section 3.3 Installation Procedure on page 6.
For supervised keypads, assign only
one keypad to each address.
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