Security System Basics

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Security Sensors
Each Comfort Input  is connected to one or more security sensors in a Zone. For example, a Motion Detector  also called Passive Infrared Detector (PIR) can be connected to a Comfort Input. PIRs should be connected to individual zones as each PIR monitors a specific area in which it is mounted.

All security sensors should provide DRY Contact or Voltage Free contacts to Comfort

Magnetic Door or window contacts can also be connected to an Input. For example a magnetic contact (MC) mounted on an exterior door should be connected to an input. A door or window may have 2 MCs in series connected to a single Comfort Input if the door has 2 sections which open independently. Several windows in the same wall of a room may be connected to a single zone in series or each window may be connected to individual inputs. It is preferable to have each security point eg window or door or PIR connected as individual zones so that it is possible to identify the point of entry for any intrusion or to detect zone faults.
Hence an Input or Zone should identify a single security point or several closely related security points.


Cytech does not manufacture any security sensors like PIRs, Magnetic contacts, Smoke/Heat/Gas detectors, etc. Any security sensor that can be used for Burglar alarms can also be used with Comfort.

Magnetic Contacts do not require any power supply. These have 2 wires that are connected to the Input.

PIRs, Smoke, heat, glass-break, gas sensors, Active infrared Detectors require 12V supply. These have 4 wires that are connected to Comfort, including 12V/COM power.


The best way to test the security sensors is by Security Check on the keypad see http://www.comfortforums.com/forum127/4054.html

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Alarm Wiring
The preferred wires to use for security sensors is multicore security alarm cables with each wire size 7 x 0.2 mm3. These can be 4 to 8 cores or more, shielded or unshielded.  Alarm cables are not highly twisted.

Shielding is not necessary for alarm cables, except where RF interference or spurious signals may lead to false alarms.  An earth wire is also found in earthed cables. For non-powered sensors like magnetic contacts, use at least 4 cores or 2 pairs so that 1 pair is spare. For powered sensors like PIRs, smoke/heat sensors, use minimum 3 pairs with 1 pair as spare. 4 pairs is better so that the power and ground wires can be doubled up. Note that the cable resistance of typically 10 ohms /100 meters will increase slowly over the years and may eventually cause problems, so doubling the wires is a good solution to reduce this effect.

Look up Burglar alarm cables or Security cables for suppliers.
The attached shows cables specs from UK manufacturer CQR Security http://www.cqr.co.uk/cable-2/professional-cable/


CAT5?
CAT5 can also be used for alarm cables with little cost difference. The only issue with CAT5 is that the wires are solid instead of multistranded and can break more easily at the termination points.

[slychiu]

End of Line Resistors

see this topic for information 

http://www.comfortforums.com/forum127/4935.html
Next

See this topic \"Programming the Security System\"
http://www.comfortforums.com/forum92/4059.html

[slychiu]

Do NOT depend only on motion detectors (PIRS) only for your alarm. PIRs are meant to a a secondary defence, while window and door contacts should be the first  line of defence. It is not recommended to use a PIR as an Entry Door, as a PIR can be triggered within the house causing false alarms.

If it is absolutely impossible to wire a magnetic contact to the Entry Door, and you have to use a PIR as entry door, then set the Away Arming Method to \"Exit Delay\". By default the Away Arming method is set to \"Final Door\", as mentioned this should NOT be the preferred method unless the wiring is not possible