JUMO Wtrans E01, Руководство по эксплуатации

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4 Transmission range
26
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 Fig. 4-3 shows, the error curve increases sharply once there are 24 transmitters.
Radio telegram
ID, measuring
value
Receiver Transmitter
Radio telegrams Transmitters
ID, measuring
value
ID, measuring
value
ID, measuring
value
ID, measuring
value
ID, measuring
value
Receiver
16 18 20 22 24 26 28 30
Number of transmitters
Fault incr
ease