Zane zTrack One, Operating Manual

Page: 12 / 17

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12
Motion GPS fix
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Sample Payload:
Payload structure (11 bytes):
LLL NNN AA TT B
Port: 204
Payload: 43ad23 0f7343 007f 0271 48
latitude (3 bytes) , longitude (3 bytes) , altitude (2 bytes) , temperature (2 bytes) ,
battery (1 byte)
LAT_MSB, LAT_CSB, LAT_LSB , LON_MSB, LON_CSB, LON_MSB , ALT_MSB, ALT_LSB ,
TEMP_MSB, TEMP_LSB , BAT
Latitude: 24 bit long signed hexadecimal number. Positive number means North,
negative means South.
Formula to get latitude from given payload:
latitude = (lat_value/8388606) *90
In our example 43ad23(hex)= 4435235(dec)
latitude = (4435235/8388606) *90=47.584920
Longitude: 24 bit long signed hexadecimal number. Positive number means East,
negative means West.
The formula to get longitude from given payload:
longitude = (lon_value/8388606) * 180
In our example 0f7343(hex) = 1012547(dec)
longitude = (1012547 / 8388606) * 180 = 21.726906
Altitude: 16-bit unsigned hexadecimal number.
In our example 007f(hex) means 127m altitude as decimal value.
Temperature:
-
1. character indicates negative or positive temperature (0 – positive, 1 – negative)
- 2. and 3. character is integer part of temperature
- 4. character is fractional part of temperature
In our example the temperature is 27.1 ° C
Battery:
-
battery status in percentage (1% - 99%)
In our example the battery level is on 48%.