Possible Impairment Of Wireless Transmission - JUMO Wtrans p Notice De Mise En Service

4 Transmission range
4.2

Possible impairment of wireless transmission

Collisions when using too many transmitters
When using a large number of transmitters, do not select a transmission interval which is too low, other-
wise the radio channel will be unnecessarily occupied. A transmission interval that is too low leads to a
very high data volume on the selected radio frequency, which can lead to collisions with other transmit-
ters. The collisions can cause wireless telegrams to be destroyed during wireless transmission.
Fig. 4-1 A transmitter's wireless telegrams reach the receiver without collisions
Fig. 4-2 Wireless telegrams from several transmitters may collide
Fig. 4-3 Collisions depending on the number of transmitters with a transmission interval of 1 s
As you can see in Fig. 4-3 the error curve increases sharply once there are 24 transmitters.
22
Transmitter
Transmitters
16
Radio telegram
ID, measuring
value
Radio telegrams
ID, measuring
value
ID, measuring
value
ID, measuring
value
ID, measuring
value
ID, measuring
value
18 20 22 24
Number of transmitters
Receiver
Receiver
26 28 30