These Recommended Practices are intended for light and heavy duty agricultural and forestry vehicles used primarily offroad as well as appropriate stationary applications which use vehicle derived components. Vehicles of interest include, but are not limited to: agricultural equipment and implements and forestry harvesting equipment. 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. This document is intended to specify the requirements for application of SAE J1939 in agricultural and forestry equipment. This document specifies the series of documents within the set of SAE J1939 documents that are applicable to agricultural and forestry equipment and provides further requirements for this industry. A primary intent of this document is to point out areas where there may be differences between SAE J1939 and ISO 11783 as applied to off-road machinery such as agricultural and forestry machines.