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RACELOGIC Support Centre

VBOX LapTimer - 'Ford' Sub-Type

When VBOX LapTimer hardware is set as 'Ford' sub-type and loaded with version 1.12 b0038 of firmware, CAN messages will be output on the COMMS port at the update rate of the GPS receiver (10 Hz).
 

Note: CAN handling will be disabled, therefore LapTimer will not display data when connected to Racelogic CAN bus.

CAN Channel Format

Data format: Motorola; Baud rate: 500 kbit/s. Standard IDs only. It is not user configurable.
 

ID** Data Bytes
1 2 3 4 5 6 7 8
0x301 (1) Sats (2) Time since midnight UTC (3) Position - Latitude MMMMM.MMMMM
0x302 (4) Position - Longitude MMMMM.MMMMM (5) Velocity (kts) (6) Heading (º)
0x303 (7) Altitude. WGS84 (m) Unused Unused Unused Unused

 

  1. If Satellites in view < 3 then only Identifier 0x301 transmitted and bytes 2 to 8 are set to 0x00.
  2. Time since midnight. This is a count of 10 ms intervals since midnight UTC. (5383690 = 53836.90 seconds since midnight or 14 hours, 57 minutes and 16.90 seconds).
  3. Position, Latitude in minutes * 100,000 (311924579 = 51 Degrees, 59.24579 Minutes North). This is a true 32 bit signed integer, North being positive.
  4. Position, Longitude in minutes * 100,000 (11882246 = 1 Degrees, 58.82246 Minutes West). This is a true 32 bit signed integer, West being positive.
  5. Velocity, 0.01 kts per bit.
  6. Heading, 0.01° per bit.
  7. Altitude, 0.01 m per bit, signed.

LapTimer uses Racelogic standard CAN output format. The VB3i CAN.dbc file (available here) can be used to quickly configure CAN channels.

COMM Port Pin Out

RS232 / CAN Connector

5 pin Lemo.png
 

PIN I/O Function
1 O RS232 Tx
2 I RS232 Rx
3 I/O CAN High
4 I/O CAN Low
5 I Power

Please note that CAN termination may be required with some hardware configurations. 

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