Safety Instructions

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SYMEO LPR

LPR-1D

Product Documentation

System Description

Page 15 of 87

Besides distance measurement, the system's communication can be used for transmitting

user data in the intervals between measurements. Transmission is asynchronous, i.e. the

data is requested and transmitted when the measurement has been completed. To transmit

data over the system, first a send data request is sent by the LPR

unit to the user. Then the

user data is received and transmitted to the second LPR

station. The data channel has a

channel capacity of 8byte/measurement cycle. This means, the overall capacity depends on

the chosen measurement frequency. I.e. if a measurement frequency of 10Hz is chosen, the

capacity is 80 byte/s

2.6 Application Examples

Figure 3 in shows the simplest arrangement of LPR

units (LPR

1DX). This is used for

measuring the distance between two LPR

units. The abbreviation means distance

measurement without positioning.

Some more complex arrangements are illustrated in the following text.

2.6.1 Redundant arrangement (2xLPR-1DX)

For reasons of operational safety, it may be necessary to combine two systems in a

redundant arrangement. Figure 4 shows two base stations and two transponders installed in

a redundant arrangement on two crane bridges. Each base station communicates with the

opposite transponder. Both systems measure independently from each other. After the

measurement, the distance from the respective partner can be output at each of the

participating stations. Optionally, a switching contact may also be actuated depending on the

distance, e.g., to trigger a warning signal for example if the crane bridges come too close to

one another and there is a danger that they may collide.

If more than one LPR

system is used, each system has its own group ID

and its own frequency channel. So both systems do not disturb each other.

2 x LPR 1DX

(Plan View)

Crane Bridge 1

Crane Bridge 2

Antenna

Radio Path

LPR Base

Station

(Station 2)

LPR

Transponder

(Station 1)

Figure 6: LPR

1DX Redundant arrangement