Telemetry Module MT-102 User's Manual - BlueNote Communications

All values are stored in 2 16 bit registers in form of 32 bit signed integer, scaled
appropriately for storing decimal values. Registers are ordered in HL order, that is High 16
bits are placed in first register (with lower address).
Example 1:
The value 1234 in register representing numbers with 2 decimals FIX(2) will be recorded as
integer value 123400.
After conversion to 16 bit form = 0x1E208
RegH = 0x0001 (1)
RegL = 0xE208 (57862)
Example 2:
Value -10,3 FIX(1)
Integer value in 32 bit register = -103
After conversion to 16 bit form = 0xFFFFFF99
RegH = 0xFFFF (65535)
RegL = 0xFF99 (65433)
Description registers
Addresses in tables point to placement of first register holding High order word of the
number. Low order word lays in next register.
0x400 (1024)
Address
Register of validity of NMEA variables
Modbus (41025)
This register is used to control whether values read from NMEA frames held in registers are
valid (up to date).
A High bit signals that data in corresponding register is valid, while Low bit signals that
register holds outdated data. This bit is set High each time the value is written to
corresponding register and reset when data is older than defined during module
configuration time of signaling variables validity.
Bit assignment is described in information bits table
Address
0x402 (1026)
Modbus (41027)
Latitude
Format 1 FIX(5) degrees (S), minutes (M), fractions of minute (m)
[SSMM.mmmmm]
Format 2 FIX(7) degrees (S), fractions of degrees (s) [SS.sssssss]
Frames $GPRMC, $GPGGA, $GPGLL,
Latitude North is represented by positive number while South is represented by negative
number.
160
Address
0x404 (1028)
Modbus (41029)
Longitude
Format 1 FIX(5) degrees (S), minutes (M), fractions of minute (m)
[SSSMM.mmmmm]
Format 2 FIX(7) degrees (S), fractions of degrees (s) [SSS.sssssss]
Frames $GPRMC, $GPGGA, $GPGLL
Longitude East is represented by positive number while West is represented by negative
number.