PROTOCOLO DE COMUNICACION CAN

There are various communication systems and various protocols for each requirement of the network, but a type of communication that is becoming more important day is the CAN protocol, this system is built into many brands and will become compulsory as the communication protocol for the BOARD DIAGNOSTIC emission control ... 

CAN or CAN Bus, is short for Controller Area Network is a bus serial communications for control applications in real time, with a communication speed of up to 1 Mbit per second, and has excellent detection and fault isolation . That is, this is the best and most current technology in new vehicles. In fact, several vehicle manufacturers since 2003, including Toyota, Ford, Mazda, Mercedes Benz, BMW and others already have this system installed. Just as OBD 2 was mandatory for all vehicles since 1996, the CAN Bus system will be mandatory in all vehicles from 2008 

This system uses two cables in which two signals traveling exactly the same amplitude and frequency but completely reverse voltage modules in these two pulses identifies the message, but also has options to keep active network but fails one of the communication cables. 

For several years, automakers have only had the option to choose from four communication protocols: ISO 9141, J1850PWM, J1850VPW, KWP 2000 / ISO 14230-4. The CAN system gave automakers a new high speed, usually 50 to 100 times faster than typical communication protocols, and reduced the number of connections required for communications between systems. 

At the same time, provided the CAN diagnostic tools manufacturers a way to speed communications between the vehicle and the tool. The diagnosis is greatly benefited since most communication speed allowed in the future, through your scan tool, view data in near real time, as now view sensor data with their scanners. 

The CAN standard was added to the specifications of OBD 2 by the committee of the International Standards Organization (ISO) and is specified under ISO 11898 (Road Vehicles - Controller Area Network) and documents defined in ISO 15765 (systems vehicle diagnostics). The California Air Resources Board (CARB) accept these ISO standards because they contribute to fulfill its mission to regulate and reduce vehicle emissions. Since 2003, several automakers have already implemented the new standard in their vehicles, but CARB requires that by 2008, all models of vehicles sold in the United States must comply.