Denon AVR-990 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(AVR) 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 (AVR)

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 (AVR)

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

SUPER STADIUM : surround mode name

*Special Parameter--- ? : for request command

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Denon AVR-990 User Manual Page 4