SYMEO Local Positioning Radar System
LPR-1DHP
Product Documentation
Protocol XP Description for TCP/IP and RS232
Copyright © Symeo GmbH 2010
Seite 40 von 40
converter either the connection to a port on the LPR has to be initialized from the PC or the
LPR unit is establishing a connection to a PC.
If the connection is established, the PC has to read the data from the LPR in fixed data
length (i.e. 89 bytes). The first byte is always the START-byte and the second byte is always
the TYPE-byte. The relevance of the following data is depending on the data type. Because
no byte stuffing occurs the content for a special data type is always constant. For example
the measured velocity of the distance data is always written in data bytes 12-15
8.3.2
Detailed description UDP Fixed-Frame Protocol
If a UDP fixed frame protocol is used, the IP and the UDP port of the PC has to be
configured in the LPR protocol inverter. The converter sends each data packet as a UDP
packet of a fixed length (89 byte) to the PC. Compared to the TCP fixed frame option the
UDP fixed frame does not verify if the data packed arrived. The content is the same as for
the TCP fixed frame protocol.
8.4
Error messages
The distance data contains an error field which indicates the status of the message. The
following errors can occur:
Content
Source
Description
Value
no error
Measurement valid
0x00
no peak detected
Base Station
No measurement signal
0x01
peak too low
Base Station
Measurement signal is imprecise
0x02
nothing received
Transponder
No measurement data received
0x03
implausible speed
Base Station
Velocity is to high
0x04
measurement botched
Base Station
Measurement is not feasible.
0x05
no occupying received
Master Transponder
Measurement channel is not
reserved
0x06
no results received
Master Transponder
No measurement data received
0x07
Trigger
Transponder
Unit did not attend the
measurement
0x08
