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J1850 is an SAE standard for vehicle communication. J1850 is the most widely used communication protocol in the automotive industry. J1850 has two formats, one is a single wire system that uses the vehicle body as the common ground and uses the variable width modulation technique. The communication speed for the one wire system is about 10.4 Kbits per second. The other format is a two wire voltage differential system that uses pulse width modulation technique. The communication speed for the two wire system is about 41.6 Kbits per second.