JUMO 902931 Wtrans Receiver with Wireless Data Transmission Operating Manual - Manual (Page 17)

17
3 Basic principles
Figure 6: Collisions in relation to the number of transmitters
at a transmission interval of 1 s
As Figure 6 shows, the fault curve increases sharply once 24 transmitters are reached.
For this reason, we recommend using a maximum of 16 transmitters for the smallest transmis-
sion interval of 1 s.
For the factory setting of 10 s, a considerably larger number of transmitters can be used.
Estimating the maximum number of transmitters
If more than the recommended 16 transmitters are to be used at a transmission interval of 1 s,
select a higher transmission interval to prevent an increased fault quota.
Example:
If the number of transmitters is increased further, this results in the calculation below in the next
example.
Example:
However, from a transmission interval of ≥ 3 s, the telegram is transmitted twice. For this rea-
son, the number of transmitters to be used is halved.
The same behavior occurs again with a transmission interval of ≥ 60 s.
From this transmission interval, the telegram is transmitted three times.
16 18 20 22 24 26 28 30
Number of probes
Fault incr
ease
16 transmitters with a transmission interval of 1 s = 32 transmitters with a transmission interval of 2 s
16 transmitters with a transmission interval of 1 s = 48 transmitters with a transmission interval of 3 s
(in theory)
16 transmitters with a transmission interval of 1 s = 24 transmitters with a transmission interval of 3 s
(effective)