Preamble Seven bytes of useful information. One portion, for example, is the first bit that determines whether the packet should be multi-cast, sent to multiple devices, or sent to just the destination device.
Start-of-Frame Delimiter A series of 8 bits that tells the receiver the real message is starting. In other words, it’s a way for the two devices to synchronize, much like two spies synchronize their watches to ensure they’re on the same time frame.
Destination Address Where the packet is going.
Source Address Where the packet came from.
Length The full size of the packet. Ensures the destination device “listens” for the full message.
Data The actual data being sent, as well as information for other, higher protocols.
Frame Check Sequence A calculated number the destination device uses to ensure it received all the data.