User's Manual
Table Of Contents
- 1 General
- 2 Introduction
- 3 System Description
- 4 Hardware
- 5 Installation
- 6 Coordinate System
- 7 Commissioning
- 7.1 Check list installation and surveying
- 7.2 Editing of configuration files for the DSP
- 7.3 Upload of configuration files for the DSP
- 7.3.1 Connection with LPR mobile unit (type: compact) via TCP/IP
- 7.3.2 Connection with LPR mobile unit (type: compact) via RS232
- 7.3.3 Upload DSP configuration file for LPR mobile unit (base station)
- 7.3.4 Upload DSP configuration file for master transponder unit
- 7.3.5 Upload DSP configuration file for transponder unit
- 7.4 Editing of configuration files for Fusion Engine
- 7.5 Upload configuration files for FusionEngine
- 8 Symeo MAP
- 9 Network Settings
- 10 Symeo 2D Protocol
- 11 Appendix A: Agency certifications
Symeo LPR
®
-System
LPR
®
-2DB
Product Documentation
Symeo 2D Protocol
Copyright © Symeo 2012
Page 124 of 132
10.3.3.13 CRC
This data field displays the CRC (cyclic redundancy check) of each data packet.
Name
Length
Description
CRC
3
ASCII string crc
CRC-16
4
CRC-value of message
Character coding: ####
Value is coded hexadecimal!
Entire length of data field: 7 Byte
A detailed description of CRCs as well as source code for the CRC can be found in chapter
10.5.
This data field can be enabled by the following line in the configuration file:
[SendCRC] 1
10.4 Bit Mask SELECTED-FIELDS
The bit mask SELECTED-FIELDS is part of the data field START. It indicates which bit fields
are activated. Once the bit mask is configured, each data packet has the same length and
the same structure. Therefore the value of the bit mask SELECTED-FIELDS is constant. By
evaluation of the bit mask at the receiver side it is possible to check for plausibility of the
configuration file.
Each data field is presented as a single bit in the bit mask. If the data field is activated the
related bit is set.
Figure 64 shows the allocation of the single bits and data fields. Bit 31 is the most significant
bit and is found in the ASCII format of the protocol on the left most side.
Important: The order of bits in this bit mask does not correspond to the order of data fields in
a data packet. The order of the data fields is described in chapter 10.2.3 (binary format) or
chapter 10.3.2 (ASCII format).
Bit
Data field
Bit
Data field
31
-
15
-
30
-
14
-
29
-
13
-
28
-
12
-
27
-
11
-
26
-
10
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