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OPNET J1850 Network Simulator
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1995 by SAE International in United States
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MIL 3's OPNET simulator was used to model Chrysler's J1850 bus. Modeled were both J1850 bus characteristics and those portions of control modules (e.g., the engine controller) which communicate on the bus. Current Chrysler control module algorithms and proposed Chrysler J1850 message formats were used to design the control module models. The control module models include all messages which are transmitted at fixed intervals over the J1850 bus. The effects of function-based messages (e.g., messages to be transmitted on a particular sensor or push-button reading) on system load were investigated by transmitting an additional message with a fixed, relatively high priority at 50 millisecond intervals.
CitationStark, J., "OPNET J1850 Network Simulator," SAE Technical Paper 950037, 1995, https://doi.org/10.4271/950037.
- OPNET (Optimized Network Engineering Tools) is a workstation-based environment for the modeling and simulation of communication systems, protocols, and networks. OPNET is a product of MIL 3, INC.
- The term “In Frame Response” (IFR) is fully defined is SAE document 2178, part 1, section 3. An IFR provides a mechanism for a module receiving a message to respond without waiting for an occurrence of J1850 bus idle, and without having to provide a separate message header for the response. The original message plus any IFRs are considered to be a “frame” of data (thus the term “In Frame Response”). Type 0 IFRs are no responses. Types 1 and 2 IFRs are responses using module (one byte) physical addresses, as defined in SAE document 2178, part 1, section 7. Type 3 IFRs consist of one or more data bytes, followed by a CRC.