transmitters to the RCM 255 receiver casement top position
(see antenna marking on
cap). This is a result of the internal antenna position that can be seen in the following picture:
Far end of
the whip
Figure 9: Internal position of the RCM 255 whip antenna
3.2 Mounting RCM 255 Near To Metallic Objects
For range performance a minimum distance of 1 cm, better 2 cm, should be given
from the whole length of the antenna to any conductive objects. Mainly the far end
of the whip should be mounted as far away as possible from all metal parts.
The internal position of the antenna is shown in Figure 9.
Please note that large metallic parts or conductive objects in the transmission direction causes
shading of the radio waves that could result in range reduction. Using a suited placed repeater
is a prospective remedial measure.
Do not mount the receiver into an enclosed metal housing
.
3.3 Transmission Range
Since the radio signals are electromagnetic waves, the signal is attenuated on the way from
the transmitter to the receiver. This means that the field intensity diminishes as the distance
between the transmitter and the receiver increases, and radio range is restricted. Obstacles
between devices can also reduce the range.
In practice, this means that the materials used in the building play an important role when an
assessment of the radio range is made. Some standard values for helping in assessing the
environment:
•
Line-of-sight connections:
Typically 30m range in corridors, up to 100m in halls
•
Plasterboard walls / dry wood:
Typically 30m range, through max. 5 walls
•
Brick walls / aerated concrete:
Typically 20m range, through max. 3 walls
•
Ferroconcrete walls / ceilings:
Typically 10m range, through max. 1 ceiling
©EnOcean GmbH, A. Anders
Page 14 of 18
RCM 255 User Manual V1.12
