Denon AVP-A1HD User Manual download pdf (Page 4)

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Protocol specification

The following three data forms are defined.

COMMAND : The message sent to a system(AVP) from a controller(Touch Panel etc.)

A command to a system is given from a controller.

EVENT : The message sent to a controller(Touch Panel etc.) from a system(AVP)

The result is sent, when a system is operated directly and a state changes.

*The form of EVENT presupposes that it is the same as that of COMMAND.

**Refer to the following table for the contents of COMMAND and EVENT.

RESPONSE : The message sent to a controller(Touch Panel etc.) from a system(AVP)

if the ‘request command’ (COMMAND+?+CR(0x0D)) has came from a controller.

The RESPONSE should be sent within 200ms

of receiving the COMMAND.

*The form of RESPONSE presupposes that it is the same as that of EVENT.

Basic specification : The command by ASCII CODE, parameter expression

*ASCII CODE which can be used is from 0x20 to 0x7F : the alphabet and the number of 0-9 , and space (0x20) , Some signs ,

AND carriage return(0x0D)--- It is used only as a pause sign.

Command structure : COMMAND + PARAMETER + CR(0x0D)

COMMAND : ASCII CODE of 2 characters

ex. SI : Select Input source

MS : surround Mode Setting

MV : Master Volume setting

PW : system PoWer setting

PARAMETER : ASCII CODE ( up to 25 characters)

ex. DVD : function name

CDR/TAPE : function name

THX SURROUND EX : surround mode name

SUPER STUDIUM : surround mode name

*Special Parameter--- ? : for request command

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Denon AVP-A1HD User Manual Page 4