HumanTechnik lisa Mode D'emploi page 11

Available accessories
External alarm ON/OFF switch
(A-2937-0)
For connection to the Infrared move-
ment transmitter. This external
alarm ON/OFF switch can be used to
enable and disable the transmitter
without triggering the alarm (if it is
positioned correctly). Please note
that the alarm ON/OFF switch on the
transmitter must be enabled in order
to connect the external alarm
ON/OFF switch. Switch for surface-
mounting. Length of the connection
cable: 10 m.
Call button
Pressing the call button on the
Infrared movement transmitter caus-
es a signal to be triggered on every
receiver which is set to the same
channel as the transmitter. This
enables people to be called who are
in other rooms. Also, this button can
be used for checking that the system
is functioning properly, even without
the accessories connected.
Radio range
Note the following points when
using the Infrared movement trans-
mitter:
The radio signals are designed to
have a range of 80 meters under
optimum conditions.
The following conditions may result
in a reduced range:
- Signal transmission through buil
ding structures or vegetation
- Interference from TVs, computer
monitors and mobile phones.
Under certain circumstances, this
may prevent the receiver from
functioning at all.
- Positioning of the transmitter at an
unfavourable distance from surfa-
ces which reflect radio waves, for
example floors and walls.
This may lead to the signal wave
being weakened or even cancelled
out by the reflected wave.
- Metallic objects reduce the range
due to the shielding effect of the
metal.
- Particularly in towns and cities,
there may be many other sources
of radio waves which can disrupt
the original signal.
- Having units operating at similar
frequencies located close to one
another may also result in mutual
interference.
English 11