Bosch D1257RB User Manual

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D1255RB/D1256RB/D1257RB | Installation Instructions | 3.0  Installation 
 
Bosch Security Systems, Inc. | 8/06 | F01U011791B 
 
Figure 1: 
D1255RB, D1256RB, and D1257RB Internal Arrangement 
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2
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5
6
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2
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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 
 
 
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. 
 
 
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 1Item 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. 
 
3.0 Installation 
3.1 
Mounting Information (D1255RB, 
D1256RB, and D1257RB) 
The D1255RB, D1256RB, and D1257RB are low-
profile, surface-mounted units molded in durable red 
plastic. Use the D56 Keypad Conduit Box (protected 
surface or flush mount) for mounting the units. 
Mounting Locations 
 
 
Do not mount the keypads and 
annunciators in locations where they are 
exposed to direct sunlight. Direct 
sunlight can interfere with the display 
screen’s visibility and damage internal 
components.  
 
Do not mount the units in wet or moist 
locations.
 
3.2 
Wiring Information (D1255RB, 
D1256RB, and D1257RB) 
A four-wire flying lead is required for the data and 
power connections between the keypad or annunciator 
and the control panel. The unit includes a wiring 
harness with four color-coded flying leads at one end 
and a female four-pin connector at the other end. 
Refer to Figure 10 and Figure 11 on page 8 to wire the 
D1255RB, D1256RB, or D1257RB.