General notes on the
Gira radio bus system
Radio transmission occurs
on a non-exclusive trans-
mission path, and interfe-
rence cannot be excluded
for this reason. The radio
transmission is thus not
suitable for security pur-
poses, e.g. emergency-
stop, emergency call etc.
If walls and ceilings are to
be penetrated along the
transmission path (Fig. 1),
the radio range depends
considerably on the type
of construction materials
to be penetrated and the
effective wall thickness.
The table shows the ca-
pability of radio signals
to penetrate different
materials.
Degree of penetration
for dry material:
Wood, plaster, sheetrock:
approx. 90% penetration
Brick, pressboard:
approx. 70 % penetration
Reinforced concrete:
approx. 30 % penetration
Metal, metal screens,
aluminium cladding:
approx. 10 % penetration
Important: Moisture in
the material reduces
penetration.
Due to the multitude of
influences, the evaluation
of the radio paths in
buildings is very difficult.
For this reason, the range
specified in the free field
(Fig. 2) refers to uninfluen-
ced dissemination of the
radio waves and optimally
aligned arials. With the
Gira radio bus system,
this is usually 100 m.
Requirements for the
measurement of field
ranges:
Level area
Horizontal distance to
interfering objects from
each point of the line
connecting the transmitter
and receiver > 20 m
Height of the measured
objects above the ground
> 2 m
Alignment of the measur-
ed objects for optimum
contact
Moist ground
Dependence of trans-
mission range from the
mounting height of the
receiver:
100 m at ≥ 2 m
56 m at 1,5 m
34 m at 1,0 m
28 m at 0,8 m
23 m at 0,6 m
18 m at 0,4 m
13 m at 0,2 m
Condition:
The mounting height of
the sensor is 2 m with a
moist ground.
Abb. 1: Walls and ceilings reduce the strength of the radio signal Abb. 2: Measurement of the free-field range
General information on the Gira radio bus system.
ca. 100 m
≥ 2 m≥ 2 m
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