RS-485 Transceivers RS-485 Transceivers in J1708 Physical Layer Applications of Heavy Duty Vehicles APPLICATION NOTE
In 1986 the Society of Automotive Engineers (SAE) issued the recommended practice J1708, which defines a bidirectional, multi-master network that enables the communication between Electronic Control Units (ECUs) in heavy duty vehicles. The standard specifies a data rate of 9.6kbps and was intended to be replaced by the much faster (250kbps) Controller Area Network (CAN) a decade later.
Still, J1708 remains alive and well, not only in refurbished networks of older vehicles, but also as a diagnostic bus in modern heavy duty vehicles. Here it coexists with CAN, which is predominantly used for the exchange of high-speed data (Figure 1).
This application note gives an overview of the hardware design aspects of a J1708 network. It explains the configuration and operating mode of RS-485 transceivers in J1708 applications, and introduces a highly robust bus node design that is immune to overvoltages of ±60V-DC and ±80V transients, while operating over a wide common-mode voltage range of ±20V.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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Feb 7, 2018 |
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Rev.0.00 |
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AN1990 |
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1013 KB |
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