Bluetooth devices who in went?how to work ?

Bluetooth was named after Harald Blatand (or
Bluetooth), a tenth century Danish Viking King.
The Bluetooth logo is made from the letters
similar to H and B, but in Germanic Runes. Since
its introduction as a wireless networking standard
in 1994 by Ericsson, Bluetooth has transformed
and morphed into a standard under the guidance
of the Bluetooth Special Interest Group (SIG)
(founded in 1998). The SIG is comprised of IBM,
Intel, Nokia, Toshiba and Ericsson (the five initial
members) along with Microsoft, Agere Systems
(then Lucent), 3Com and Motorola. The main
purpose of the group is to promote the usage and
the standardization of the Bluetooth platform.
Though the technology has been around for quite
a while, the first commercial Bluetooth products
were only available in the year 2000.
This paper will provide a brief over view of the
technology and its numerous applications.

2> Technical Specifications

General
Bluetooth is a low power device which operates in
the open unlicensed Industrial, Scientific and
Medical (ISM) band at 2.4 GHz. The Basic Rate is
1 Megabit per second (Mbps) with an Enhanced
Data Rate of 2 or 3 Mbps. The typical
performance of the Basic Rate, ranges from the
lower hundreds to about 700 kbps. It provides bi-
directional radio transmission between devices by
using time-division duplex (TDD) scheme and
allows up to 7 devices to be connected together
to form a piconet. A piconet is the fundamental
Bluetooth network where one device is the Master
(provides synchronization reference) and all the
other devices are known as the Slaves.
Modulation and Power
For Basic Rate, a binary FM modulation is used
to reduce radio complexity. Enhanced Data Rate
employs PSK (π/4-DQPSK or 8DPSK). Bluetooth
devices can be divided into three classes based
on the power. Table 1 shows the maximum
output power for each class and the approximate
range.
Table
National Instruments Hardware
LabVIEW 7.1 and later include Bluetooth VIs with
which LabVIEW developers can build custom
Bluetooth applications. Creating Bluetooth server
and client applications in LabVIEW is similar to
creating server and client applications for TCP
communication. A Bluetooth server uses the
Service Discovery Protocol (SDP) to broadcast the
availability of the services contained and listens
for inbound connections. A client creates an
outbound RFCOMM connection to a server. Once
the client and server connect to each other, they
exchange data until the client or server terminates
the connection or until the connection is lost.
LabVIEW PDA supports Bluetooth as it takes
advantage of the virtual serial driver most
Bluetooth drivers provide. The driver supports
only one active serial channel at a time, which
can be either an outbound (client) port or an
inbound (server) port. There are different methods
to initialize the port between the PocketPC and
Palm modules, however once the connection is
made the current Serial PDA VIs are used.
7. Case Studies
Bluetooth Enabled DMM with LabVIEW PDA
This uses NI4050 in a Pocket PC 2003 device to
acquire data such as DC Volts, AC Volts, and
resistance. Different tests can be selected to
determine whether or not the acquired
measurement is within a predefined specification.
More information can be found here.
AmFax Bluetooth Tester
The AmFax PXI-5060 Bluetooth 1.2, 2.0 +EDR PXI
Radio Test Set is a highly optimized platform for
accurately testing Bluetooth enabled devices. The
system provides a highly integrated set of
measurement routines that can be integrated into
the manufacturing process or utilized in
development.

Get your devices working the way you want
Get your devices working the way you want
Most Bluetooth ® enabled devices are easy to
connect or "pair," so you can enjoy a wireless
lifestyle. If you're having trouble getting two
devices to work together, like a mobile phone with
a hands-free car system or headphones with a
music player, you may just need some advice.
The Bluetooth SIG is a trade association
We do not make, manufacture or sell Bluetooth
products. We can guide you in the right direction
and provide some basic tips for using Bluetooth
enabled products. We also have a Bluetooth FAQ
page you might find helpful.
We have over 25,000 Bluetooth SIG member
companies. Our members help advance Bluetooth
technology and create the innovative Bluetooth
products that enable the wireless lifestyle for all
to enjoy. If you need Bluetooth product specific
information, technical support, drivers, or other
technical information, try directly contacting the
device manufacturer.

Connecting your Bluetooth enabled devices

Often it's simple to connect two Bluetooth
enabled devices—you don't even need
instructions. However, there are tens of
thousands of different Bluetooth enabled devices,
from phones and headsets to cars and computers.
If you run into any problems getting devices to
work properly or pair with each other, learning a
little about how Bluetooth technology works could
help you fix the problem. Here are a few things
you should understand before you get started.
Finding your drivers
A driver is a software program allowing a device
to communicate with a computer. Without drivers,
the devices connecting to your computer—phones,
MP3 player, or digital camera—won't appear in
your computer's list of connected devices and
won't work with your computer.
There is no such thing as a "Bluetooth driver."
But if you have a Bluetooth enabled device, you
may need a driver to get the device to work
properly with your computer. Getting drivers and
installing them depends on whether you have a
Windows PC, a Macintosh, or another operating
system.
If you are missing a driver or it doesn’t
automatically install, contact the manufacturer.
The manufacturer should also be able to tell you
if there is a newer version of the driver available
for their product. The Bluetooth SIG does not
distribute drivers for Bluetooth enabled devices.
Making sure devices are Bluetooth enabled
Both devices must be Bluetooth enabled to pair.
If you're not sure a device includes Bluetooth
technology, check with the manufacturer. Not all
wireless devices use Bluetooth technology
(especially mice and keyboards), so check to be
sure.
To add Bluetooth technology to a computer, just
plug a Bluetooth adapter into one of the USB
ports.
Pairing devices

Not all Bluetooth enabled devices are designed to
be paired. Logically, there's no reason to connect
a wireless mouse to a wireless headset. You
should be able to pair a Bluetooth enabled
headset to a Bluetooth enabled phone, or a
Bluetooth enabled mouse to a Bluetooth enabled
computer.
If you're not sure whether the two devices you
want to connect are designed to be paired with
each other, make sure their Bluetooth profiles
match.
Pairing with the profile
A Bluetooth profile provides manufacturers with a
detailed description of designing a certain
function into a Bluetooth enabled device. An
exampl
e is the Hands-Free Profile. For a mobile
phone to connect to a wireless headset, both
devices must support the Hands-Free Profile.
Manufactures list supported profiles in the user
manual or specifications for that device.
Here's an example of two Bluetooth enabled
products not likely to work together:
A mouse, which typically supports the Human
Interface Device Profile and a camera aren't likely
to work together since cameras don't support this
profile. Looked at logically, it's obvious why,
since cameras aren't designed to be controlled
with a mouse.