Yamato DP-6700, Technical Manual

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YCO-201008
DP-6700 Technical Manual
2-3
(1) Communication distance
In general, the possible communication distance using a scale with a built-in ZBee module is shown in
the following table.
Measurement conditions: A coordinator box is installed at the height of about 2m above the floor.
If a cabinet (shelf case) sized 270 x 180 (cm) is installed in a place with a clear view of the area, the
communication distance reduces to about 10 m. Although communication can be achieved even with
some obstacles, it is important to install the unit in a place that allows as clear view of the area as pos-
sible. If the distance is 10 m or longer, the communication condition is significantly influenced by the
installation environment. Accordingly, the best way is to install scales within 10 m radius of the coor-
dinator or the router. Please make sure to check the communication distance before use because it
varies by the scale.
(2) Factors in obstructing communications
ZBee uses a frequency band of 2.4Ghz, and the radio waves are high in directivity and poor in avoid-
ing an obstacle . Because they are easily absorbed in water, the communication distance reduces in a
highly humid environment. The human body is largely made up of water, so it absorbs radio waves. If
the distance between two devices is close to the limit of the communication distance, a presence of a
person standing on the communication path may block the communication.
No consideration is required for the presence of transparent glass becauae radio waves pass through
such glass.
Consideration should be paid to metals and concrete because they block radio waves.
(3) How to extend communication distance
If a router is not used (up to 8 scales can be connected), the coordinator box must be installed
in a location without obstacles in between. As one of the ways of reducing the adverse effect of
obstacles, the coordinator box is recommended to be installed in a some what high place (at a
height of about 2 m above the floor)
Chapter 2 Communication option