Installation guide

LMU Users Guide
V1.0.6 December 10 2009
Copyright ©CalAmp DataCom Inc 2009
- 92 - CalAmp Proprietary & Confidential
data string is comprised of any printable ASCII characters with the exception of the
‘>’, ‘<’, and ‘;’ characters which are used as delimiters. Field separators, including
commas and spaces, are not part of the messages unless otherwise specified. Strings
generally use fixed-length fields although some sentences use comma or semicolon
delimiters. The message qualifier and the message identifier determine the format
and length of the data string.
• ;
Field Separator. The semi-colon is used to separate optional fields that may appear
after the main sentence.
• ID=DDDD
Vehicle ID. The vehicle ID is a 4 character (DDDD) user defined string used to
uniquely identify an LMU. Please note that this ID has no relationship to the User
Defined Mobile ID type.
• *FF
Checksum. A checksum expressed in ASCII representation of an eight-bit
hexadecimal value.
12.1.2 PV (Position Velocity) Sentence Structure
The general structure for the message body of a PV sentence is as follows:
PVAAAAA±BBCCCCC±DDDEEEEEFFFGGGHI
Format
Units
Range
Description
PV
NA
NA
PV Message Identifier
AAAAA
Seconds
0-86399
GPS Time of Day Starting at 00:00:00
GMT
±BBCCCCC
Dec Deg
00.00000 –
90.00000
Latitude to 5 decimal places
±DDDEEEEE
Dec Deg
000.00000 –
180.00000
Longitude to 5 decimal places
FFF
MPH
0 – 999
Horizontal Speed
GGG
Deg
0 – 359
Heading
H
NA
0 = 2D GPS
1 = 3D GPS
9 = Unknown
Fix Status
I
NA
0 = No Fix
1 = Last Known
2 = Real-time
Age of Fix
12.1.3 LN (Long Navigation) Sentence Structure
The general structure for the message body of a LN sentence is as follows:
LNAAAAABBB±CCDDDDDDD±EEEFFFFFFF±GGGGGGHHIIIJ±KKKLMMMNO
O{PPQQ}RRRRRRRRRRST
Format
Units
Range
Description
LN
NA
NA
LN Message Identifier
AAAAABBB
Seconds
00000.000 –
86399.999
GPS Time of Day Starting at 00:00:00
GMT
±CCDDDDDDD
Dec Deg
00.0000000 –
Latitude to 7 decimal places