The RS232 output is present on the 6 Way Hirose connector on the bottom of the unit and can be used to provide a connection to a computer for testing online with VBOX Test Suite.
Protocol:
115200 Baud, no parity, 8 data bits, 1 stop bit
Message format:
$VBSIG$StttaaaaaaoooooovvvhhAAAVVxxyysddTTcc
| Parameter | Number of bytes | Description |
|---|---|---|
| $VBSIG$ | 7 | Header Message identifier as ASCII string. |
| S | 1 | Total satellites Number of satellites used in solution irrespective of GNSS. Range (0, 255). Note: All eight bits are used. |
| ttt | 3 | Time Number of 10 ms ticks since midnight UTC. Range (0, 8641000). |
| aaaaaa | 6 | Latitude Signed integers, 0.0000001 minutes per bit. Range (-539999999999, 540000000000) |
| oooooo | 6 | Longitude Signed integers, 0.0000001 minutes per bit. Range (-1079999999999, 1080000000000). |
| vv | 2 | Speed Unsigned integer, 0.01 kts per bit. Range (0, 63535). |
| hh | 2 | Heading Unsigned integer, 0.01° per bit. Range (0, 35999). |
| AAA | 3 | Altitude Signed integer, 0.01 m per bit. Range (-8388608, 8388607). |
| VV | 3 | Vertical velocity Signed integer, 0.01 m/s per bit. Range (-32768, 32767). |
| xx | 2 | Lateral acceleration Signed integer, 0.01 g per bit. Range (-32768, 32767). |
| yy | 2 | Longitudinal acceleration Signed integer, 0.01 g per bit. Range (-32768, 32767). |
| s | 1 | Solution type Enumeration as signed integer.-1: No data0: No solution1: Stand alone2: Code differential3: RTK Float4: RTK Fixed5: Fixed position6: IMU coasting |
| dd | 2 | Date DOS format.Bits 0–4: Day of month Range (1, 31).Bits 5–8: Month Range (1, 12).Bits 9–15: Years since 1980 Range (0, 128). |
| TT | 2 | Differential Correction Age Unsigned integer, 0.01 seconds per bit (i.e. 10 ms per bit). Range (0, 655.35s). |
| cc | 2 | Checksum Standard Racelogic communications CRC calculation,Seeexamplebelow. |
CRC Calculation example:
s[n] is a string containing the message
Polynomial:= 4129
CRC:=0;
for Loop:=1 to Length(s) do
begin
Temp:=s[Loop];
CRC:= CRC xor (integer(Temp) *256);
CRC:= CRC mod 65536;
for i:=7 downto 0 do
begin
if ( (CRC and 32768)=32768) then
begin
CRC:= CRC *2 ;
CRC:= CRC xor Polynomial;
end
else
begin
CRC:= CRC *2 ;
end;
CRC:=CRC mod 65536;
end;
end;
result:=CRC;