Which statement best describes a PDU1 PGN?

• A. PDU1 PGNs use the PS field to address a specific destination.
• B. PDU1 PGNs are always broadcast messages.
• C. PDU1 PGNs contain no data payload.
• D. PDU1 PGNs are used for network control only.

Answer: (A)

In NMEA 2000, messages can be sent either to a single device or to everyone on the bus. PDU1 is the addressed format, meaning it is designed to reach a specific destination. The PS field in a PDU1 message carries that destination address, so the data are intended for one particular node rather than being broadcast to all devices. That’s why describing PDU1 PGNs as using the PS field to address a specific destination is the correct way to characterize them.

The other statements don’t fit because PDU1 messages are not inherently broadcast, they do carry data payload according to the PGN’s definition, and they’re used for more than just network control.