
Wiring an external SAB bell
9.6 Wiring an external SAB bell
On an external bell to the SPC controller board the relay output is wired to the
strobe input with Bell Hold Off (BHO) and Tamper Return (TR) connected to their
respective inputs on the external bell interface.
A resistor (2K2) is pre-fitted on the controller board between the BHO and TR
terminals. When wiring an external bell, connect this resistor in series from the TR
terminal on the controller to the TR terminal on the external bell interface.
External bell wiring
9.7 Wiring an internal sounder
To wire an internal sounder to the SPC controller connect the IN+ and IN–
terminals directly to the 12 V sounder input.
Internal sounder wiring (12 V)
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