J1939 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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