Command Format And Answer Format; Protocol For Data Transmission And Reception; Basic Procedure - Denon DVM-2845 Specification
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Also See for DVM-2845:
- Operating instructions manual (38 pages) ,
- Specifications (2 pages)
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Ver 2.01
Date : Nov.29.2005
1.3
Command format and answer format
This unit shall be based on commands each of which consists of a data row
are without a PC )
trans-mitting station shall be designed to send block check characters
with the data row enclosed in STX
The receiving station shall regard receipt of BCC as the completion of command reception when
it has received STX.
Here are the formats.
Commands
<BCCL>
STX (Start of TeXt)
CC (Command Code)
PC (Parameter Code)
ETX (End of TeXt)
BCC (Block Check Character)
code
Answers : <STX> <RC> <AC> <PC0> <PC1> <PC2> <--------> <PCn> <ETX> <BCCH>
<BCCL>
STX (Start of TeXt)
RC (Reply Code)
AC (Answer Code)
PC (Parameter Code)
ETX (End of TeXt)
BCC (Block Check Character)
Y=0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F
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
Copyright 2005 DENON Co.,Ltd.
composed of command codes
( text start : 02h )
: <STX> <CC> <PC0> <PC1> <PC2> <---------> <PCn> <ETX> <BCCH>
: 02h
: Command code
: Defined for each command
: 03h
:
CC + PC0 + PC1 + PC2 + --------------- + PCn + ETX = XYh
(Each of X and Y is 4 bit long )
BCCH ( high-level byte ) = X as converted to an ASCII code
BCCL
( low-level byte )
: 02h
:
: Answer code
: Defined for each command
: 03h
:
RC +AC + PC0 + PC1 + PC2 +
(Each
of
X
BCCH ( high-level byte ) = X as converted to an ASCII code
BCCL
( low-level byte )
( CC )
and parameter codes
and ETX
( text termination : 03h ) .
( contents and number of parameters )
X , Y=0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F
= Y as converted to an ASCII
Reply code (=Command code)
( contents and number of parameters )
-------------
and
Y
is
4
bit
= Y as converted to an ASCII
4 page of 46
( some commands
( PC ) . The
( BCC )
following ETX,
+ PCn + ETX = XYh
long)
X
,
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