Installation manual

normally open side of each relay. Whichever relay operates will present
it’s own image to be seen on the monitor.
It is usually better to mount the relay board in a junction box with BNC
panel mount socket connectors for 4 video IN and 1 video OUT such as
our UNIBOX which allows four Relay Boards to be mounted together or
2 boards on top of the SEM02 zone expansion module. You can use
8-core screened cable for each Camera signal with good results, but for
best quality use RG59 cable. You will need a separate power supply if
using more than one 12v camera.
The rule of thumb is for the response to do the * explanation above
then to start a timer for maybe 20 seconds then do Camera 1 response.
Camera one response could stay indefinitely until another Camera
changes the selection. Make Camera 1 to be a useful view to settle ON,
i.e. a front driveway or courtyard. When the Doorbell is pressed, the
front door camera could be switched through. For CCTV also consider
the lighting situation. You may also wish to start a a time lapse video
machine using a different output (set the VCR record time to 3 minutes
at a time).
Lighting
The same external PIRs can be used to operate both camera switching
and lighting. With any lighting system, taking the light level into
account before switching a light is essential. This may involve either a
'conditional branch' where the response checks for the light level from a
photocell on a zone before switching the lights (X-10 address, Response
126) or if your lighting levels are predictable throughout the year, you
could use the time of day as a 'conditional branch'. Allow about four
response lines per camera for this type of behaviour. Each lighting
Response may include one of the 8 timers to switch Off the lights a few
minutes later. You can use the Light Sensor’s ‘zone OFF’ Response to
turn OFF all the lights at 'dawn'.
Radio Transmitters
Some installations may require radio control of certain zones such as
panic switches, arming, or maybe even zone shunting. These can be
achieved using stand-alone radio transmitters and boxed receivers such
as the Visonic product range. The resistors for each zone would
normally be fitted across the relays inside the receiver’s box.
Radio-transmitters often have 4 switches available and sometimes
customers require their Garage Door or Gate also to be controlled from
a single transmitter. This is quite simple to achieve because Garage
Doors are often manually opened from with the property using a
normally open bell-type push-switch. To provide control using a spare
channel of the transmitter, simply connect the receivers normally open
relay in parallel across the bell-push terminals.
Automatic Gate Control
Comfort can control gates using the outputs and the 12 Volt relay
boards. Often these are triggered by pulsing closed a normally open
Comfort Installation Manual
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