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CONTENTS
Radio Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Agile™ 200 Series RF Fire System . . . . . . . . . . . . . . . 3
Site Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
RF BASICS
The RF Waveband
Radio frequency (RF) devices use radio waves to communicate
(transmit and receive data) in the form of coded radio signals. The
RF waveband (part of the electromagnetic spectrum) ranges from
a few kHz to hundreds of GHz and can be divided up into different
sections, with different radio characteristics and capabilities.
The Agile™ 200 Series RF fire system uses a frequency range
based around 868MHz in the UHF region (the lower end of
microwaves); that is a wavelength of 346mm.
Short-range, low-power RF Systems are becoming more popular
for a wide range of applications; within fire and security products
they are often used in temporary installations or situations where
building work and unsightly cabling cannot be tolerated.
100kHz
10MHz
10kHz
1MHz
100MHz
VLF
LF
MF
HF
VHF UHF SHF EHF
The RF Network
Agile™ 200 Series RF devices can transmit and receive, they are
transceivers. When two devices communicate directly with one
another, they have set up a link; the devices at each end of a link
are known as nodes. A set of devices (or nodes) communicating
together is called a network. There can be a wide range of network
topologies, as shown in the examples following:
AGILE™ RADIO FIRE DETECTION SYSTEM
APPLICATION and INSTALLATION GUIDELINES
1GHz
100GHz
10GHz
1000GHz
THF
IR
System Sensor 200 Series RF
Some Guidelines for using the Agile™ 200 Series
Radio System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
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Ring
Line
RF Signal Characteristics
Fundamentally radio signals, like light, travel in straight lines. And
in the same way as light they can be affected by objects in their
path. Forming part of the electromagnetic energy spectrum, they
are capable of transmission through some materials, absorption by
others and can be reflected, refracted and diffracted. The effects
on radio waves caused by different materials are dependent upon
the material's properties.
Metallic surfaces are excellent reflectors of radio frequency
(RF) energy; water and wet areas may also be good reflectors.
Visible light
Refraction occurs when electromagnetic waves pass across
a boundary between materials of different densities (refractive
index) and diffraction can occur when signals pass close to large,
particularly sharp, objects. Attenuation in different materials
(resulting from energy absorption and high frequency scattering)
is caused by the material's molecular characteristics, structure and
resonances at different wavelengths.
In an open space, the power reduction down a signal path is
proportional to the square of the distance from the transmitter (see
Figure 1 following).
Fully
Connected
Tree
Bus
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Mesh
Star
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Related Manuals for System Sensor AGILE
Summary of Contents for System Sensor AGILE
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Page 1: Table Of Contents
How to Resolve a Poor Link Quality Agile™ 200 Series RF Fire System . . . . . . . . . . . . . . . 3 RF Do’s and Don’ts... -
Page 2: Rf Signal Attenuation
(see Figure 2). Figure 2: Different RF Signal Paths The Agile™ 200 Series RF devices have a typical transmission range in free air of up to 500m, but within an office or factory environment, signals can come into contact with many objects in a range of materials such as ceilings, floors and walls at different angles, desks, filing cabinets and a variety of plant and machinery. -
Page 3: Agile™ 200 Series Rf Fire System
Descendant In the Agile™ RF system, each node can have up to 6 active links with its neighbours; 2 links going toward the gateway (one from Note the unique and important Back-up Node #2; this has only one each of its 2 parents) and up to 4 links going toward the network parent –... -
Page 4: Network Synchronisation
When doing a site survey, give adequate consideration to how that takes over the network synchronisation role should a gateway the site will be used when the Agile™ RF system is working. For go ‘missing’. Hence, the network continues to operate, but in a... -
Page 5: What To Take To A Site Survey
. The use of the Agile IQ™ software application will provide a high What to take to a Site Survey level of assistance in accomplishing these tasks quickly and efficiently. -
Page 6: Radio System
● Strong local interferences (such as from certain types of communications devices and RFID readers) Agile™ RF radio devices appear as wired elements to a fire panel. Check to ensure the maximum number of combined wired and ● Site changes, such as construction of new internal walls wireless devices on a loop has not been exceeded (198 in CLIP ●... -
Page 7: Measuring Wall Attenuation
● Allow longer links or repeaters to be used ● Add a repeater (or another Agile™ RF device) to a marginal or poor link ● Consider if the wall attenuation is set too high and can be reduced ... -
Page 8: Rf Do's And Don'ts
RF DO’S AND DON’TS Do’s ● Do ensure there are sufficient loop addresses to account for all the RF devices ● Do ensure a minimum separation distance of 1m exists between neighbouring RF devices in all directions 0.5m 0.5m 0.5m 0.5m ●... -
Page 9: Don'ts
● Do ensure other wireless devices (like RFID readers) operating ● Don’t locate Agile™ RF devices back to back where there is at 868MHz are at least 5m away from any RF devices little or no attenuation, as 1m separation is required between... - Page 10 SYSTEM SENSOR EUROPE Pittway Tecnologica S .r .l . Via Caboto 19/3 34147 TRIESTE Italy www .systemsensoreurope .com A05-0473-010...
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