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Remote frame with J1939 protocol

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vnw

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Hello
Can anyone explain me why remote frame is not possible in J1939 communication?

As per SAE "The RTR bit
(defined in the CAN protocol for remote frames) is not to be used in the recessive state (logical 1). Therefore, Remote
Transmission Requests (RTR = 1) are not available for use in SAE J1939."

why it is always required to send dominant bit in j1939 communication??
 

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