RS232 Output - VBOX Touch (v2/v3)

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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;

result:=CRC;