SAE J1939

Title: Recommended Practice for a Serial Control and Communications Vehicle 
Network 
  
Document Number:    J1939 
Date Published:    January 2005 
  
Scope:
These Recommended Practices are intended for light, medium, and heavy duty 
vehicles used on or off road as well as appropriate stationary applications 
which use vehicle derived components (e.g. generator sets). Vehicles of 
interest include, but are not limited to: on and off highway trucks and their 
trailers; construction equipment; and agricultural equipment and implements.The 
purpose of these Recommended Practices is to provide an open interconnect 
system for electronic systems. It is the intention of these Recommended 
Practices to allow Electronic Control Units to communicate with each other by 
providing a standard architecture. 
  
http://www.sae.org/products/j1939a