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J1939: Unused bits

J1939: Unused bits

(OP)
I a have a question regarding the J1939 standard;

I have some PGNs that do not use all of their bits. What these unused bits should be set to? (0 or 1 or something else)

I do not have the J1939 specification :(


I am a bit of a newbie to this CAN communication. So any sort of help is appreciated. Thanks!


   

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