CAN
CAN bus (for controller area network) is a vehicle bus standard designed to allow microcontrollers and devices to communicate with each other within a vehicle without a host computer.
http://en.wikipedia.org/wiki/Controller_area_network
FMS standard
In order to be compliant with FMS standard, truck manufacturers implement a specific gateway ECU which reads the informations required by the standard from all the suitable places and thru all the required standard, complying with internal vehicle-brand-specific protocols, and makes all these informations available thru a specific CAN bus to which the tachometer device is connected. In this way, an FMS compliant digital tachometer devices can be easily connected to any FMS compliant truck. Extracted from
Links
http://marco.guardigli.it/2010/10/hacking-your-car.html
CAN chips
- MAXIM MAX13050
- Microchip MCP2551 line driver
- Philips PCA82C250
- Philips/NXP TJA1054
- Texas Instruments SN65HVD234D 3.3V CAN transceiver (Teltonika FM4200)
- Microchip MCP2515 CAN controller