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As an exception,
ACK 0xFD H
NACK 0xFE H
are defined as a 1byte reply message from Amplifier, and it is used
when the value of CMD in the command transmitted from Host Controller
is 0x00 to 0x7f.
If a reply from the Amplifier is other than ACK/NACK
It assumes that a request is answered in the form of the specified protocol and the details
are the specifications of each category.
When a command cannot be executed, or when there is no function to a
command, it assumes that the following 4-byte command request has been answered.
NO-EXECUTABLE .... STX + BC + xxH(PDC) + 0E H
NO-FUNCTION .... STX + BC + xxH(PDC) + 0F H
NO-EXECUTABLE is answered, when as follows.
Although OPECODE(CMD) is understood,
-The contents of an argument have mistaken.
-Amplifier does not correspond to the contents of an argument.
-A command cannot be executed in the present state.
NO-FUNCTION is answered when Amplifier cannot recognize a command on
an OPECODE(CMD) level.
6. About the specifications of each category
The contents from PDC to DATAN are described on the specifications
of each category.
STX + BC + PDC + CMD + Data1 + -------- + DataN + CS
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7. Operation in POWER OFF.
When amplifier is powered off, only the following commands can be received.
-Amplifier Category - POWER ON Command
-Amplifier Category - STATUS REQUEST Command
About the command of others from Host Controller, amplifier answers NACK.