The Packet Type specify the type of information contained in the packet and the direction of the packet. The associated list is as follows:

Bit 7:5 Hex Description Direction
000 0x00 Response Out
001 0x01 Ack Out
010 0x02 Command In
011 0x03 Data Out
100 0x04 Error Out
101 0x05 Reserved
110 0x06 Reserved
111 0x07 Reserved

The Direction is viewed by the Neblina module. A packet is either sent from Neblina to a host (Out), or from a host to Neblina (In).