JUMO 902931 Wtrans Receiver with Wireless Data Transmission Operating Manual - Manual (Page 18)

3 Basic principles
18
External transmitters
External transmitters may transmit on the same frequency. If, for example, the transmitter and
an external transmitter transmit their wireless telegrams at the same time, the telegram is de-
stroyed. Because the transmitters are not able to check their own active transmission while
transmitting, no error is detected.
Electrical devices
In a harsh industrial environment, wireless telegrams cannot be immediately destroyed by such
things as frequency converters, electrical welding equipment, poorly shielded PCs, audio/video
devices, electronic transformers, or electronic ballasts.
Error fade-out
The wireless timeout parameter on the receiver side can be used to fade out lost telegrams (ei-
ther due to external influence or collisions caused by a large number of transmitters) and no
error message then occurs. The last received value is thus maintained over 2 to 20 transmis-
sion intervals and only then is the wireless timeout alarm activated (display "----").
TIP!
In the event of collisions caused by an excessive number of transmitters, observe and, if nec-
essary, correct the factors for "number of probes", "transmission intervals", and, on the receiv-
er, "wireless timeout".