Message ID




3 bits

Defines message priority during arbitration


1 bit

This bit is reserved for future, always it must be set as zero

Data page

1 bit

expansion of possible parameter group

PDU format (PF)

8 bits

PF indicate message transmitted with a destination address or always broadcast message

PDU specific (PS)

8 bits

If PF is between 0 and 239 then PS contains addressable MSG PDU1

If PF is between 240 and 255 then PS contains only broadcast MSG PDU2

Source Address

8 bits

Source Address

SAE J1939

Total 29 Bits