Safety Instructions

SYMEO LPR
®
LPR-1D
Product Documentation
System Description
Copyright © Symeo GmbH 2010
Page 14 of 87
System Number 1
Group-ID: 1
FSK-Channel: 8
System Number 2
Group-ID: 2
FSK-Channel: 9
Station 1
Station-ID: 1
Station 2
Station-ID: 2
Station 3
Station-ID: 3
Station 4
Station-ID: 4
Station 1
Station-ID: 1
Station 2
Station-ID: 2
System Number 3
Group-ID: 3
FSK-Channel: 10
System Number 4
Group-ID: 4
FSK-Channel: 11
Station 1
Station-ID: 1
Station 2
Station-ID: 2
Station 3
Station-ID: 3
Station 1
Station-ID: 1
Station 2
Station-ID: 2
Figure 4 – Example of the relation Station-ID, Group-ID und Frequency Channel
SID: 2
GID: 3
FSK: 10
SID: 1
GID: 3
FSK: 10
SID: 3
GID: 3
FSK: 10
SID: 1
GID: 1
FSK: 8
SID: 2
GID: 1
FSK: 8
SID: 1
GID: 2
FSK: 9
SID: 2
GID: 2
FSK: 9
Crane Rail
Crane Crab
Radio Path
Crane Bridge
SID: 4
GID: 2
FSK: 9
SID: 3
GID: 2
FSK: 9
Figure 5 – Example of multiple LPR
®
-systems in one crane environment
2.5 Mode of Operation of the System
The distance is determined by measuring the transit time of radio signals. For this, the
transponder unit first sends a communication packet to the base station that is to carry out
the measurement. The station that is addressed in this way sends a response sequence and
a special, wideband response signal which is ideal for making distance measurements. The
transponder synchronizes itself with this signal and after a precisely known time replies in
highly synchronized manner with exactly the same signal. The base station receives this
signal and uses the signal transit time to determine its distance from the transponder.
The distance can be output after the measurement by any of the units participating. As an
option, if the distance falls below a given value, a switch (dry contact) can be actuated to
trigger a warning signal, for example.