Which statement accurately describes PDU2 PGNs?

Which statement accurately describes PDU2 PGNs?

• A. PDU2 PGNs are destination-addressed using the PS field.
• B. PDU2 PGNs are broadcast messages with no unique destination.
• C. PDU2 PGNs are used exclusively for engine data.
• D. PDU2 PGNs require a specific destination address in the header.

Answer: (B)

PDU2 PGNs are broadcast messages on the NMEA 2000 CAN network. They use a PDU Format value of 240 or higher, and the PDU Specific field is not a destination address but a group extension. Because there isn’t a single target device, every node on the bus that supports that PGN can read and interpret the data. In contrast, PDU1 messages (PF < 240) carry the destination address in the PS field, making them targeted to one device. Engine data and many other PGNs can be PDU2, and there isn’t a requirement for a specific destination address in the header for PDU2.

PDU2 PGNs are broadcast messages on the NMEA 2000 CAN network. They use a PDU Format value of 240 or higher, and the PDU Specific field is not a destination address but a group extension. Because there isn’t a single target device, every node on the bus that supports that PGN can read and interpret the data. In contrast, PDU1 messages (PF < 240) carry the destination address in the PS field, making them targeted to one device. Engine data and many other PGNs can be PDU2, and there isn’t a requirement for a specific destination address in the header for PDU2.