Denon DVD 3800BDCI Serial Protocol - Page 5

Ver.3.09

Data :

Mar.24.2008

6 page of 50

Copyright

2008

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

trans-mitting

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

+AC

+

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

issue

a

status

request

command,

and

decide

whether

this

unit

has

finished

operating

with

Denon DVD 3800BDCI Serial Protocol - Page 5

Command, format, answer, Protocol, transmission, reception

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