After the bit flow sequence for the synchronization of reception, the frame byte contains the protocol data and direction identity.

Frame byte	Binary Data	Definition
E0	1110 0000	Command from master, no reply required, first transmission
E1	1110 0001	Command from master, no reply required, repeated transmission
E2	1110 0010	Command from master, reply required, first transmission
E3	1110 0011	Command from master, reply required, repeated transmission
E4	1110 0100	Reply from slave, ok, no errors found
E5	1110 0101	Reply from slave, command not supported
E6	1110 0110	Reply from slave, Parity error, repeat requested
E7	1110 0111	Reply from slave, Command not recognized, repeat necessary

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