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 | |||
- If Satellites in view < 3 then only Identifier 0x301 transmitted and bytes 2 to 8 are set to 0x00.
- 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).
- Position, Latitude in minutes * 100,000 (311924579 = 51 Degrees, 59.24579 Minutes North). This is a true 32 bit signed integer, North being positive.
- Position, Longitude in minutes * 100,000 (11882246 = 1 Degrees, 58.82246 Minutes West). This is a true 32 bit signed integer, West being positive.
- Velocity, 0.01 kts per bit.
- Heading, 0.01° per bit.
- 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
| 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.