Bluetooth (Wireless) Technology

Bluetooth from Expert Monitoring
Over the last few years, radio-frequency technologies
have been developing as a relevant and increasingly
indispensable communication support.
Together with the innumerable applications in our
everyday life, the usage of wireless communications
in industrial environment seems to start being of great
interest to the scientific community.

“The possibilities of the wireless technologies to add
value in monitoring, control and industrial-system
configuration are tremendous”

Key benefits are the elimination of cables and connectors
from the manufacturing floors, resulting in shorter
installation times and reduced machine maintenance,
and the potential for a flexible topology and mobile
applications. Furthermore, the wireless technologies
will facilitate communications with rotating and moving
machine parts and enable systems to be programmed,
actuated and automatically report their status back
to a central controller or to an operator with a laptop
or another wireless device.

I. BLUETOOTH TECHNOLOGY
Bluetooth is a standard for short-range radio communications, originally developed as a cable
replacement to connect portable devices. It uses the
Industrial Scientific Medicine radio band (ISM)
2.45 GHz and Frequency Hopped Spread Spectrum
(FHSS) as medium access. The required and nominal
range is 10m (transmit power 0dBm) and an external
power amplifier can be added to extend the range
up to 100m. The raw bit rate is 1 Mbps, with a Gaussian
Frequency Shift Keying (GFSK) modulation technique

Bluetooth supports point to point and point to multi-point
connections, which can be established automatically and
dynamically between Bluetooth units, e.g. once a laptop
enters the range of some wireless devices.

II. INDUSTRIAL REQUIREMENTS
Mission-critical applications in industrial environment represent an interesting prospect for the use of
Bluetooth. As a low cost, low power, short-range
radio technology, it would be particularly suitable for
this kind of applications, where the radio link reliability
is very important in order to reach high demands on
deterministic behavior and real-time performance .

Industrial equipment is often installed in harsh
environments, with extreme temperature, vibration
and other radiating sources. The ISM band is a
globally available, license-free band, reserved for
general use by Industrial, Scientific and Medicine
applications . This involves the presence of other
users or polluters of the shared spectrum.

The Bluetooth standard has been built in order to
guarantee reliability and robustness in presence of
interference. The Frequency Hopping Code Division
Multiple Access (FH-CDMA) and the Error Correction
techniques involved in the system specifications
can assure a good degree of interoperability
with other radio networks or generally radiating
sources.

For more information on this topic,
visit
www.expertmon.com

Information kindly provided by...
Ken Gale - Product Development Director
Expert Monitoring Ltd
Cardiff Business Technology Centre
Tel: +44(0) 2920 647021
Fax: +44(0) 2920 647009
Email:
k.gale@expertmon.com


  

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