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J1939 Application Layer PGN
In SAE J1939, the acronym PGN stands for Parameter Group Number and represents the identifier of a J1939 message. Every J1939 message has a unique PGN assigned to it by the SAE committee when the message is defined.
A PGN is 18-bits wide and is made up of the following fields: Extended Data Page, Data Page, PDU Format, PDU Specific. Depending on the value of the PDU Format field, a message is either destination specific, meaning it is for a specific CA, or global, meaning it is for all CAs. The PGN identifier is encoded to allow for a maximum of 8,672 unique PGNs.
PGN 61444 Electronic Engine Controller 1
| Transmission Repetition: | engine speed dependent |
| Data Length: | 8 |
| Default Priority: | 3 |
| Parameter Group Number: | 61444 |
| Start Position | Length | Parameter Name | SPN |
| 1.1 | 4 bits | Engine Torque Mode | 899 |
| 2 | 1 byte | Driver’s Demand Engine – Percent Torque | 512 |
| 3 | 1 byte | Actual Engine – Percent Torque | 513 |
| 4-5 | 2 bytes | Engine Speed | 190 |
| 6 | 1 byte | Source Address of Controlling Device of Engine | 1483 |
| 7.1 | 4 bits | Engine Starter Mode | 1675 |
| 8 | 1 byte | Engine Demand – Percent Torque | 2432 |
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