Which condition signals that a PGN is a global broadcast rather than destination addressed?

Which condition signals that a PGN is a global broadcast rather than destination addressed?

• A. PF is less than 240.
• B. PF is greater than or equal to 240.
• C. PS contains the address.
• D. The PGN number is even.

Answer: (B)

In NMEA 2000, how a PGN is addressed is determined by the PDU format (PF). If the PF is 240 or greater, the message uses the PDU2 format, which is a global broadcast intended for any node that recognizes that PGN; there is no single destination address. The PS field in this case carries group function information rather than a specific destination. If the PF is less than 240, the message uses PDU1 format and is destination-addressed, with the destination address encoded in the PS field. Therefore, the signal that a PGN is a global broadcast is PF being 240 or greater.

In NMEA 2000, how a PGN is addressed is determined by the PDU format (PF). If the PF is 240 or greater, the message uses the PDU2 format, which is a global broadcast intended for any node that recognizes that PGN; there is no single destination address. The PS field in this case carries group function information rather than a specific destination. If the PF is less than 240, the message uses PDU1 format and is destination-addressed, with the destination address encoded in the PS field. Therefore, the signal that a PGN is a global broadcast is PF being 240 or greater.