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Ver 1.00
Date : Oct.10.2003 4 page of 33
Copyright 2003 DENON Co.,Ltd.
1.3 Command Format and Answer Format
This unit shall be based on commands each of which consists of a data row ( some commands
are without a PC ) composed of command codes ( CC ) and parameter codes ( PC ) . The
transmitting station shall be designed to send block check characters ( BCC ) following ETX,
with the data row enclosed in STX ( text start : 02h ) and ETX ( text termination : 03h ) .
The receiving station shall regard receipt of BCC as the completion of command reception when
it has received STX.
Here are the formats.
Commands : <STX> <CC> <PC0> <PC1> <PC2> <---------> <PCn> <ETX> <BCCH>
<BCCL>
STX (Start of Text) : 02h
CC (Command Code) : Command code
PC (Parameter Code) : Defined for each command
( contents and number of parameters )
ETX (End of Text) : 03h
BCC (Block Check Character) :
CC + PC0 + PC1 + PC2 + --------------- + PCn + ETX = XYh
(Each of X and Y is 4 bit long ) X , Y=0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F
BCCH ( high-level byte ) = X as converted to an ASCII code
BCCL ( low-level byte ) = Y as converted to an ASCII
code
Answers : <STX> <RC> <AC> <PC0> <PC1> <PC2> <--------> <PCn> <ETX> <BCCH>
<BCCL>
STX (Start of Text) : 02h
RC (Reply Code) : Reply code (=Command code)
AC (Answer Code) : Answer code
PC (Parameter Code) : Defined for each command
( contents and number of parameters )
ETX (End of Text) : 03h
BCC (Block Check Character) :
RC +A C + PC0 + PC1 + PC2 + ------------- + PCn + ETX = XYh
(Each of X and Y is 4 bit long) X , Y=0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F
BCCH ( high-level byte ) = X as converted to an ASCII code
BCCL ( low-level byte ) = Y as converted to an ASCII
code
1.4 Protocol for Data Transmission and Reception
This unit is based on half-duplex communication. The unit shall therefore transmit commands
and receive answers according to the following procedure.
1.4.1 Basic Procedure
1)
The host shall select commands for this unit and transmit them to this unit. Command
interval time is MIN 40µsec.
2)
Having issued a command, the host shall receive an answer from this unit, then issue
the next command.
3)
The host shall analyze the RC, AC, and PC as answers given and decide whether the
command has been normally executed.
4)
The host shall give an answer to a command that gives operational instructions, then
4


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