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RACELOGIC Support Centre

RS232/NMEA Output

This page covers the RS232/NMEA output format information for VBOX 25 Hz Speed Sensor (v2) units. The RS232 output is present to provide a connection to a computer for configuring the settings of the VBOX unit through the Setup software. It can also output NMEA format messages.
RS232 Racelogic Data Format

Protocol:

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

Message format:

$VBSS25$glbtttaaaaoooovvvhhAAAVVVDspprrSSHHPPRRyyxxYYzzddTTTkkqQQT1T1wwwWWWiicc

 

You can find the full list of Channel Definitions here.

Parameter Number of bytes Supported* Description
$VBSS25$ 7 N/A Header

g

1

Green tick mark_45px.png

GPS sats

Number of GPS satellites used

l

1

Green tick mark_45px.png

GLONASS sats

Number of GLONASS satellites used

b

1

Green tick mark_45px.png

BeiDou sats

Number of BeiDou satellites used

ttt

(MSB first)

Green tick mark_45px.png

Time

Ticks since midnight UTC, incrementing every 10 ms

aaaa

4 (MSB first)

Green tick mark_45px.png

Latitude

Signed integers, 0.0000001° per bit

oooo

4 (MSB first)

Green tick mark_45px.png

Longitude

Signed integers, 0.0000001° per bit

vvv

3 (MSB first)

Green tick mark_45px.png

Velocity

0.001 km/h per bit

hh

2 (MSB first)

Green tick mark_45px.png

Heading

0.01° per bit

AAA

3 (MSB first)

Green tick mark_45px.png

Altitude

0.01 m per bit

VVV

3 (MSB first)

Green tick mark_45px.png

Vertical velocity

0.001 m/s per bit

s

1

Green tick mark_45px.png

Solution type

pp

2 (MSB first)

Red cross_45px.png

Pitch angle derived from KF

0.01° per bit

rr

2 (MSB first)

Red cross_45px.png

Roll angle derived from KF

0.01° per bit

SS 2 (MSB first) Red cross_45px.png

Slip angle derived from KF

0.01° per bit

HH

2 (MSB first)

Red cross_45px.png

Heading derived from KF

0.01° per bit

PP

 

2 (MSB first)

Red cross_45px.png

Pitch rate derived from internal/external IMU

0.01°/sec per bit

RR

 

2 (MSB first)

Red cross_45px.png

Roll rate derived from internal/external IMU

0.01°/sec per bit

yy

2 (MSB first)

Red cross_45px.png

Yaw rate derived from internal/external IMU

0.01°/sec per bit

xx

2 (MSB first)

Red cross_45px.png

X accel from internal/external IMU

0.01 m/s² per bit

YY

2 (MSB first)

Red cross_45px.png

Y accel from internal/external IMU

0.01 m/s² per bit

zz

2 (MSB first)

Red cross_45px.png

Z accel from internal/external IMU

0.01 m/s² per bit

dd

2 (MSB first)

Green tick mark_45px.png

Date

DOS format

TTT

3 (MSB first)

Green tick mark_45px.png

Trigger event time

0.000001 ms per bit

kk

2 (MSB first)

Red cross_45px.png

Kalman Filter Status

q

1

Red cross_45px.png

Position Quality

QQ

2 (MSB first)

Red cross_45px.png

Speed Quality

0.001 m/s per bit

T1T1

2 (MSB first)

Red cross_45px.png

T1

0.0000001 ms per bit

www

3 (MSB first)

Red cross_45px.png

Wheel speed 1

0.001 m/s per bit

WWW

3 (MSB first)

Red cross_45px.png

Wheel speed 2

0.001 m/s per bit

ii

2 (MSB first)

Red cross_45px.png

Heading_IMU2 derived from KF

0.01° per bit

cc

2 (MSB first)

Green tick mark_45px.png

Checksum

See CRC Calculation example below

*Unsupported channels will be displayed as 0.

NMEA Output 

The VBOX 3iS can output 7 types of NMEA messages:

  • GGA
  • GLL
  • RMC
  • VTG
  • GSA
  • GSV
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