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Installation, Maintenance and Operation Manual V24a (June 2012)
British Telecommunications plc 2012
Connecting alarm pin inputs
For alarm panels that provide ‘Positive applied’ or ‘Positive removed’ communicator outputs, the
unit’s input pins can be wired directly to the Alarm panel.
Figure 20 - Alarm panel with Positive Applied or Removed communicator outputs
For alarm panels that have open collector communicator outputs (sometimes referred to as
‘Negative Applied’ outputs) an additional 10K pull-up resistor will be required to be connected for
each input pin.
Figure 21 - Alarm panel with Open collector (Negative applied) communicator outputs with an
additional 10K pull up resistor for each pin
Note:
Ensure the 0V of the alarm panel is Commoned to the 0V of the Redcare Secure unit when
separate Power Supply Units are used.
Alarm panel
Secure unit
Alarm panel
Secure unit
Aux 12V
10K
Resistors