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Packet structure

+-------------------------+|       Dongle Code       ||        (1 Octet)        |+-------------------------+|       Packet Delay      ||        (2 Octets)       |+-------------------------+|        Preamble 1       ||        (1 Octet         |+-------------------------+|        Preamble 2       ||        (1 Octet)        |+-------------------------+|    Family/Address/IR    ||        (1 Octet)        |+-------------------------+|         Payload         |.                         ..                         ..                         .|        (N Octets)       |+-------------------------+

Description

The WattStopper Digital Lighting Management (DLM) andLegrand Nitoo Open protocol share common packet structure,and are used in the lighting control industry.

The Dongle Code field contains a value that is one of:

• 0="No Error",
• 1="Preamble 1 Error",
• 2="Preamble 2 Error",
• 3="Checksum Error",
• 4="Timeout Error",
• 8="Other Family Error"

The Packet Delay field contains an integer value that is thenumber of milliseconds since the previous packet, in big-endian byte order.

The Preamble 1 and Preamble 2 fields should each contain0xAA.

The Family/Address/IR field contains 3-bits of family code, 2-bits ofaddress mode, 2-bits of IR (infrared) routing, and 1-bit unused.The 8 Legrand NITOO families are

• 000=CAD Filaire
• 001=TopDog
• 010=CAD RF
• 011=CAD PLC
• 100=CAD IR
• 101=DLM
• 110=none
• 111=Escape/DLM Bootloader

The Address mode bits are defined as

• 00=Broadcast
• 01=multicast
• 10=unicast
• 11=anonymous unicast

The Payload varies depending on the Family.