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SAE J1939-71
Vehicle Application Layer
J1939/71 specifies the application layer for a J1939 network and is the only application layer published and supported for J1939. This specification is responsible for defining all application layer SPNs and PGNs. Also included in this specification is a parameters, offset, scaling, and acceptable range. PGNs are defined to be broadcast or destination specific and given a transmit rate. Below is an example PGN.
PGN 65101 Total Averaged Information
Table of Contents
| Transmission Repetition: | On request |
| Data Length: | 8 |
| Default Priority: | 7 |
| Parameter Group Number: | 65101 |
| Start Position | Length | Parameter Name | SPN |
| 1-2 | 2 bytes | Engine Total Average Fuel Rate | 1834 |
| 3-4 | 2 bytes | Engine Total Average Fuel Economy | 1835 |
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