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SAE J1939 defines five layers in the seven-layer OSI network model, and this includes the Controller Area Network (CAN) ISO 11898 specification (using only the 29-bit/"extended" identifier) for the physical and data-link layers. Under J1939/11 and J1939/15, the data rate is specified as 250 kbit/s, with J1939/14 specifying 500 kbit/s.
NMEA 2000 is based on the SAE J1939 high-level protocol, but defines its own messages. [2] [3] NMEA 2000 devices and J1939 devices can be made to co-exist on the same physical network. [4] NMEA 2000 (IEC 61162-3) can be considered a successor to the NMEA 0183 (IEC 61162-1) serial data bus standard. [5]
Heavy duty vehicles (greater than 14,000 lb or 6,400 kg) made after 2010, [1] for sale in the US are allowed to support OBD-II diagnostics through SAE standard J1939-13 (a round diagnostic connector) according to CARB in title 13 CCR 1971.1. Some heavy duty trucks in North America use the SAE J1962 OBD-II diagnostic connector that is common ...
The first formal specification was approved in 2005, and the first RV-C products were marketed at that time. The RVIA has continued to refine and expand the protocol, and in 2008 applied to ISO with the intention of opening the RV-C protocol to the world community. In 2006 the first RV-C-equipped RVs were sold in America.
DeviceNet supports 125 kbit/s, 250 kbit/s and 500 kbit/s data rates. Depending on the chosen cable type, DeviceNet can support communication up to 500 meters (using round, large diameter cable). Typical round cable supports up to 100 meters, while flat-style cable supports up to 380 meters at 125 kbit/s and 75 meters at 500 kbit/s.
Agricultural implement ISOBUS plug. ISO 11783, known as Tractors and machinery for agriculture and forestry—Serial control and communications data network (commonly referred to as "ISOBUS") is a communication protocol for the agriculture industry based on, and harmonized with, the SAE J1939 protocol (which is based on the CAN bus).
Transport-layer services include the transmission of multi-CAN-frame messages based on the ISO 15765-2 multi-frame messaging scheme. It was developed and is used primarily by General Motors for in-vehicle communication and diagnostics. [3]
The specification is faster than MOST, well tested, and open. However, it lacks industry advocates. Ethernet is more standard, higher-speed, equally noise immune, being differential and isolated by transformers. However Cat 5 cable may be too expensive or heavy for automotive applications. Also, standard Cat 5 plugs do not resist vibration.