Safety Instructions

SYMEO LPR
®
LPR-1D
Product Documentation
Protocol Description Binary XP (1D messages)
Copyright © Symeo GmbH 2010
Page 69 of 87
7.2 Data Types
The second byte in each data packet specifies the data type.
7.2.1 Type 0x00 – Distance Data
Direction: LPR
®
-
Content
Length
Data type
Value
START
1
unsigned integer
0x7E
TYPE
1
unsigned integer
0x00
Source
1
(LPR
®
address)
2
see chapter 7.4.1
0x####
Destination
1
(LPR
®
address)
2
see chapter 7.4.1
0x####
Antenna number
2
1
unsigned integer
0x##
Distance [mm]
4
signed integer
0x#### ####
Velocity [mm/s]
4
signed integer
0x#### ####
Level [dB]
1
signed integer
0x##
Distance Error
1
see chapter 7.4.2
0x##
Status
3
1
unsigned integer
0x00
CRC
2
unsigned integer
0x####
END
1
unsigned integer
0x7F
Total length without byte stuffing: 21 byte
1
) Any measurement is always executed by a LPR
®
-B base station, this means, the base station
measures its distance etc. towards a transponder unit. The source field always contains the address of
the LPR
®
-B base station. The destination field contains the address of the measured transponder.
Even if the data set is transferred further on to another unit (e.g. another transponder), the value of the
source and destination field is maintained.
2
) The field antenna contains the antenna number of the base station as well as the antenna number
of the measured transponder. The 4 lower bits represent the antenna number of the base station

3) reserved for future application. Currently set to 0.
Example of Distance Data
7E 02 C1 81 7F
7E 00 08 03 08 02 11 00 00 10 62 00 00 00 7A E6 00 00 AF C4 7F
Figure 43 - Protocol for a single 1D measurement: request data and following distance data
This protocol shows a simple example for 1D measurement. A distance data set (or also 2
distance data sets) alternate with a send request. The Send Request indicates that the LPR
®
unit is listening to a data set from the user (for example relays external commands). The
Distance Data sends the data to the user (i.e. to a PLC or to a PC/software).
Send request:
7E 02 C1 81 7F