Wiring an external SAB bell
Installation & Configuration Manual
For all EOL types, a resistance below 300Ω is considered a short. If the
resistance is not within the thresholds stated, this is treated as a disconnection.
10.6 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