Inputs
There are 3 sets of input connections on the Smoke Screen (Alarm Set, Trigger and Hold-off) that should be
connected to clean contacts. For the Smoke Screen to produce ‘smoke’ all 3 sets of connections must be ‘open
circuit’ (this can be changed to ‘closed = activate’ – see “Invert Trigger Mode” in the Programming section but note
that ‘open = activate’ is used in this manual). We recommend to use the default setting ‘open circuit = activation’ to
ensure that the Smoke Screen will activate in case the alarm cables are tampered from the outside. If one set of
connections is ‘closed circuit’ then the Smoke Screen is prevented from producing smoke. Hence the production of
smoke is controlled using one or a combination of the following:
Alarm Set – a normally closed relay connected across the alarm panel ‘Set’ output connections, which is open when
the alarm panel is ‘Set’ and closed when the panel is ‘Unset’.
Trigger – a normally closed relay connected across the alarm panel ‘Trigger’ or ‘Intruder’ output connections, which
is open when the alarm panel or controlling device is in ‘Alarm’.
Hold-off – usually a PIR / movement sensor normally closed output, which opens when the sensor detects
movement, connected to the Smoke Screen “Hold-off” normally closed connections.
Additional hold-off – any form of normally closed relay / micro switch can be connected to the “Hold-off”
connections. Where fitted in parallel as an addition to a PIR both devices must be ‘open’ to produce ‘smoke’.
Delaying an activation
After the Smoke Screen has received the required 3 inputs to produce smoke, an activation can be delayed for a
period between 0 and 60 seconds (in 1 second intervals). This can be used to sequence activations in a multi-
machine installation. See “Smoke Delay” in the Programming section.
Stopping an activation
Once activated the Smoke Screen will stop producing ‘smoke’ before the end of the programmed smoke time only if
the ‘Alarm Set’ is selected to a non-alarm state.
Preventing an activation
To prevent the Smoke Screen from making smoke during a service inspection under any circumstances select the
“Service Mode” dip switch to on (see separate section).
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