1 intrusion alarm technology wireless systems. 2 intrusion alarm technology wireless systems use...

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INTRUSION ALARM TECHNOLOGY

WIRELESS SYSTEMS

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Wireless systems use radio frequencies (RF) to connect sensors to the control panel.

In wireless system devices can still be hardwired and as a result would be a hybrid system, both wireless and hardwired.

Wireless devices are normally battery powered and are self contained units with LEDs used as status indicators.

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Because the remote sensors are battery operated they will need to be monitored regularly to make sure the battery power is sufficient enough to transmit signals back to the CP.

Wireless systems eliminate the need to install cables to each device which makes them quicker and easier to install.

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Wireless systems can also incorporate CCTV cameras as complete intrusion detection system.

This unit has the traditional look of a hardwired system with a wireless module and antenna that transmits and receives signals from remote devices.

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A wireless security system operates by networking the monitoring devices so that they transmit information back to the receiver, control panel or other receiving device.

Depending on the devices that are included in the system, device placement will have to be chosen carefully.

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The devices used in a wireless security system usually have a “range of effectiveness”, in which they are able to easily transmit information back to the receiver.

This range is frequency dependent, the higher the frequency the further the operating range of the devices.

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Chinese made wireless alarm systems operate at 433MHz.

Common frequencies used for wireless alarm systems are;

1) 315MHz (mainly used in China)2) 433MHz (USA, Latin America, EU)3) 868MHz (EU, AU)4) 912MHz (EU).

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Ranges for remote devices vary widely however an installer can expect 500’ in open air and 100’ to 300’ with obstructions.

RF SIGNALS WILL PENETRATE MOST OBSTACLES, HOWEVER THE FURTHER THE DISTANCE THE LESS EFFECTIVE THE RF SIGNALS WILL BE BASED ON A 433MHz SIGNAL.

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The receiver supervises each remote device at preset time intervals.

If the transmitter fails to check in a specific number of times during the preset interval, an indication is made locally or remotely that the sensor is not functioning.

This signal is separate and distinct from an alarm signal.

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Todays wireless technology incorporated into intrusion detection systems can offer as many if not more features than a traditional hard wired system.

They can provide upwards to 40 programmable wireless zones and can also provide 8 to 22 hard wired zones.

Many wireless alarm systems provide 4 CCD cameras incorporated into the system.

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Wireless systems are compatible with cellular alarm monitoring that allows you to control your entire security system from your iPhone, iPad, Android or computer.

A full suite of home automation and home control devices that enable remote light, lock, thermostat and surveillance camera control.

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Because wireless alarm systems use radio frequencies sources of interference must be taken into consideration.

Depending on the frequency of the system cordless phones operating in the 900MHz range may cause interference.

In the lower frequencies radio controlled toys can cause interference.

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Metal obstructions can also degrade the RF signal significantly.

Mirrors will cause reflection problems causing much of the signal to bounce in different directions.

The thicker the building materials the more the RF signal will degrade.

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Because of their distance limitations wireless alarm systems are primarily designed for home and small business installations.

Larger commercial installation will still utilize the traditional hard wired systems where cable lengths can exceed 1000’ or more.

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Wireless alarm systems are similar to addressable systems in which each remote device has it’s own code.

New device codes can be programed so that the control panel will recognize it and the user can document each device by an easy numeric system.

Once programed the CP will discover the device automatically.

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The initial installation consists of wiring a power transformer, hooking up an RJ-31X and plugging in an Ethernet connection.

Everything else can be installed wirelessly.

Each remote wireless device has a tamper circuit which replaces the need for an EOLR and will sound an alarm if the device is handle while the system is armed.

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There are additional terminals for hard wired zones, aux power and input devices.

The hard wired zones are the exact same as any hard wired intrusion system and require an end of line resistor.

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Depending on the system the receiver antenna can be replaced with a higher gain antenna for longer ranges and to compensate for obstructions.

These antennas use either a TNC or SMA connection.

1 intrusion alarm technology wireless systems. 2 intrusion alarm technology wireless systems use...

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