Bosch DCU 130 Betriebsanleitung Seite 20

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2.5 Wireless radio link
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DCU 130 users are responsible for compliance with
the applicable directives and restrictions in the
country concerned.
2.5.1 Important information on WLAN and Blue-
tooth
WLAN (Wireless Local Area Network) is the term used
to describe a wireless local radio network. With WLAN,
there is a radio link in the free 2.4 GHz ISM range (ISM:
Industrial, Scientific, Medical) or 5 GHz range. We re-
commend using the 5 GHz range where possible, as
Bluetooth connections (e.g. mobile phone, KTS modu-
le) limit the WLAN communication in the 2.4 GHz range.
This frequency range is subject to state legislation, can
however be used without a license in most countries.
Consequently a large number of applications and de-
vices employ this frequency band for transmission. This
can result in frequency interference.
Depending on ambient conditions, the WLAN link may
therefore deteriorate, e. g. in the case of Bluetooth
links, cordless telephones, radio-controlled thermome-
ters, radio-controlled garage door openers, radio-cont-
rolled light switches or radio-controlled alarm systems.
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Extreme caution is to be taken if wearing pacema-
kers or other vital electronic devices when using
radio systems, as proper functioning of these items
could be impaired.
Pay attention to the following to ensure the best possi-
ble connection:
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The WLAN radio signal always tries to find the most
direct path. When setting up the PC/Laptop and ac-
cess point (refer to Section 2.5.2), make sure there
are as few obstacles as possible (e. g. steel doors
and concrete walls) which could interfere with the
radio signal from and to the DCU 130.
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Inside buildings, the range of the WLAN is also
greatly influenced by the construction materials
used. Common masonry, wooden and dry walls have
little dampening effect on the spread of radio waves.
Thin gypsum walls can however cause problems, as
considerable amounts of moisture may accumulate
in the gypsum and result in the absorption of radio
signals. Metal or concrete walls (in particular steel-
reinforced concrete) present a strong barrier to
radio waves. Cellar ceilings are often impenetrable.
Generally speaking, walls with a lot of installed metal
(e.g. pipes, wires) obstruct radio waves.
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Radio reception is also impeded by large metal ob-
jects such as radiators and window frames as well as
active sources of interference such as mobile pho-
nes, motion sensors and microwave ovens.
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The human body also impedes radio transmission.
For this reason, always make sure that there are no
people stood between the transmitter and receiver.
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We recommend having network infrastructure ins-
talled and maintained by a network specialist.
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Keep the SSID and the codes for the radio link in a
safe place. Make sure these data are readily to hand
in case faults occur.
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We recommend a thorough inspection of the pre-
mises on commissioning: Establish where in the
building the DCU 130 works properly and where the
operating limits are.
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If the DCU 130 is used inside a vehicle (Faraday
cage), radio communication may be severely impe-
ded.
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The radio link is affected by weather conditions.
The reception signal may therefore vary.
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Please contact your network specialist with any
queries.
2.5.2 Notes on access point (WLAN)
An access point is an electronic device which acts as an
interface between a radio network and a cable-connec-
ted computer network. This allows DCU 130, PC, laptop
and a printer to be wirelessly connected.
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We recommend using WLAN standard IEEE 802.11n
(data transmission rate max. 600 Mbps) for the
access point. The "extended range" function is not
supported.
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The WLAN configuration always depends on the con-
figuration of the access point available.
Heed the following:
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The access point should be located as centrally and
high up as possible, ideally under the ceiling. The
access point must not be installed behind a metallic
object, such as a radiator, for example, or in a metal
switching cabinet.
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If only one access point is present, the antenna
should face downwards towards the floor. If an
access point has multiple antennae, they should be
aligned three-dimensionally.
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The highest and best transfer rates are achieved
when there is visual contact between DCU 130 and
the access point.
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In the event of a poor connection it may be useful to
change the channel set on the access point. Where
possible avoid employing channels adjacent to those
already in use.
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It is advisable to configure radio communication enco-
ding at the access point.
Robert Bosch GmbH