Accenta/Optima Engineer’s Manual
9
External Siren (Bell Box) Output
The external siren (bell box) is usually installed in a high position from where the siren could be seen and
heard.
Terminal TADB are for connection to the external siren. These terminals provide a power/hold-off supply,
sounder trigger and tamper circuit to protect the external siren housing.
Figure 11. External Bell-box Wiring
The terminals are summarised as follows:
T = Negative (-Ve) tamper return
A = Negative (-Ve) supply (0V)
D = Positive (+Ve) supply (12V)
B = Negative (-Ve) Sounder trigger
For ease of installation, the Optima/Accenta control panels and Reson8 external sirens and modules use the
same markings.
Where a discrete external siren is used, it should be connected to terminals D and B. Terminals T and A are
then used for tamper protection for the housing.
Bell Box
-
J6
+
TA
DB
+
-
1A
BELL/STROBE
F3
Panel
Board
-
+
T
A
D
B
+
-
Board
Reson8
Yellow
White
Green
Red
Black
Yellow
White
Green
Red
Black
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