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RACELOGIC Support Centre

VBOX Touch - RS232 Output

The RS232 output is present on the top CAN/Serial port of VBOX Touch and can be used to provide a connection to a computer for testing online with VBOX Test Suite or for outputting laptiming data.

VBOX Data Format

This is output when VBOX Stream is selected within the Serial Port Settings menu.


Protocol:

115200 Baud, no parity, 8 data bits, 1 stop bit
 

Message format:

$VBTse$StttaaaaaaoooooovvvhhAAAVVVxxyysddTTcc
 

Parameter Number of bytes Description

$VBTse$

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
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).

vvv

3

Speed
Unsigned integer, 0.001 km/h per bit. Range (0, 16777.215).

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).

VVV

3

Vertical velocity
Signed integer, 0.001 m/s per bit. Range (-8388608, 8388607).

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 data
  • 0: No solution
  • 1: Stand alone
  • 2: Code differential
  • 3: RTK Float
  • 4: RTK Fixed
  • 5: Fixed position
  • 6: 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

Time since trigger event
Unsigned integer, 0.000000001 seconds (i.e. 1 ns) per bit. Range (0, 429496729516).

cc

2

Checksum
Standard Racelogic communications CRC calculation, See example below.

Lap Timing Data Format

This is output when Lap Timing is selected within the Serial Port Settings menu.
 

Protocol:

115200 Baud, no parity, 8 data bits, 1 stop bit
 

Message format:

$$LLTTnnnnttttllsssscc
 

Parameter Number of bytes Description

$$

2

Header
Message identifier as ASCII string.

LL

2

Length
Message length not including header or checksum. Fixed at 0x0012 for this message.

TT

2

Type
Message type. Fixed at 0x0030 for this message.

nnnn

4

Serial number
Unit serial number as unsigned integer.

tttt

4

Lap time
Unsigned integer, 0.001 s per bit.

ll

2

Lap number
Unsigned integer.

ssss

4

Stint time
Unsigned integer, 0.001 s per bit.

cc

2

Checksum
Standard Racelogic communications CRC calculation, See example below.


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;

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