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Accenta/Optima Engineer’s Manual

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

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