BlueTexGPS Mobitex Integration guide v.2.6
5
If there is an external I/O it to has the function of a button. The indication of external
I/O is done with the yellow led by the arrows. External I/O work as a sticky button and
override sticky buttons F1 to F6. External I/O is configurable.
PROTOCOLS
There are several protocols to communicate with the unit.
The mobitex client-server communication is specified to use POSPAC18 and over
the Bluetooth link, DSUB9 or SMS configuration can be done (read more below) and
NMEA v0183 over the Bluetooth and in the DSUB9 connector is used to get the
personal navigation system.
POSPAC18
The back office positioning solution is achieved by the BlueTexGPS by generating
and sending the current position over the mobitex network as a HPID15 message.
The message interval is configurable. The message data format is POSPAC18, i.e.
the position, time, date and optional 3 byte payload is compressed to only 18 bytes.
This has the benefit of minimizing the radio traffic and saving precious battery power.
The 3 byte payload can be set to any user defined value. In the BlueTexGPS, the
payload is used for indicating the status of the unit for the back office system. This
status could say “normal operation”, “parked car”or “other obstacle” for instance.
BYTE
NR
NAME
SIZE
(BITS)
COMMENT
1-2
Date
16
7 bits for year, 4 bits for month, 5
bits for day 0000010 1001 10011 for 19th
September 2002
3-4
Time
1+16 Number of seconds since midnight. MSB is
put in the field “extra bits”.
5
Lat. deg. 8
Latitude degrees. 0=90° south,
90=equator, 180=90° north
6-7 Lat.
frac.
1+16 5 decimals for latitude (accuracy <
0,8m). MSB is put in the field ”extra
bits”.
8 Long.
deg.
1+8
Longitude degrees. 0=180º west, 180=0º,
360=180º east.
MSB is put in the field ”extra bits”.
9-10 Long.
frac.
1+16 5 decimals for longitude (accuracy <
0,8m). MSB is put in the field ”extra
bits”.
11
Speed
1+8
Speed in km/h. Max 512 km/h. MSB is put
in the field ”extra bits”.
12
Direction 8
Circle split in 256 parts
13
Temp
8
0 = -128ºC, 128 = 0ºC, 255 = 127ºC
14 RSSI
8 0-255
15-17 Payload
24
18
GPS-q
2
0 = no gps, 1 = gps position, 2 =
differential gps position
18 Extra
bits
5
The 5 extra bits from the fields with +1
above is collected in the order the
appear in the package. (time, lat frac,
