Yamaha MTX3 User Manual download pdf (Page 17)

4. Command Se

uence

Below are examples of how to process remote control.

When viewed from the controller, the following major phases exist in order to perform remote control

Normal procedure detail

The controller designer needs to design and implement the blue items in the above figure

The detailed sequences of various procedures are provided below

Communication start sequence

The amount of time for the controller and the controlled device to start is different.

Remote control is an act of controlling the controlled device from the controller, so the controller must

wait for the controlled device to become ready.

The controller needs to wait using the sequence below

1. If a logical session, as on an Ethernet network, needs to be established, the controller tries to establish the session itself.

(This is not necessary for a connection that only needs to be connected physically, as in RS-232C.)

2. After the session is established, the controller sends devstatus commands at 1 second or longer intervals.

3. If

"OK devstatus devmode

"NOTIFY devstatus devmode

is returned, the controller checks the information.

4. If the controller determines that the controlled device is in normal running mode, the controller starts the user defined

remote control operation. If the controlled device is not in normal running mode, the controller continues trying

The reason for using such a sequence is provided below

Example when the controller starts earlier than the controlled devic

In this case, regardless of whether the controller sends devstatus devmode requests,

the controller was able to determine whether the device has started with the active NOTIFY devstatus devmod

message from the controlled device.

Controlled deviceRemote controller

devstatus devmode

4. Connection detected.

1 second or

longer intervals

1 second or longer

intervals

1. Establish communication path to

controlled device.

Time

* If the communication path is

already established, the controller

sends

devstatus devmode at 1 second or

longer

intervals until a result notification

is returned.

The controller checks the

run mode included in the result

notifications

to see if the device is ready to start

remote control communication.

The device may also actively

send change notifications,

so the controller must monitor both

OK devstatus devmode "normal"

devstatus devmode

NOTIFY devstatus devmode "normal"

Controlled deviceRemote controller

Connection unknown

Waiting to start

Connected physically

devstatus devmode

Normally running

Device starting

Device normal running

NOTIFY devstatus devmode "normal"

Connection detection

* NOTIFY devstatus is received

before OK devstatus,

so at that point, the controller

can assume that a connection

has been established.

Normal procedure

• Detect operation of controls.

• Receive communication from the

device.

Start procedure

Communication start

• Wait for the device to start (devstatus)

Initial setting

• MTX external control protocol setting

(scpmode)

Send request commands

depending on the

operation.

• set

• setn

• sett

• setr

• ssrecall, etc.

Apply changes depending

on the notification.

• OK

• OKm

• NOTIFY

Control or display

• Position change

• Display change

For various events

• Parameter syncing

• Event processing

Detects the operation

of controls by the user.

• Operation of a parameter control

• Operation of a snapshot (preset) control

Request periodically.

• mtrstart

Information query trigger

caused by user operation

• snapshot (preset) display

• device information display

Send request commands

depending on the

necessary information.

• sscurrent

• ssnum

• ssinfo

• devinfo, etc.

Meter display

is necessary.

2. Send

"devstatus devmode"

3. Recieve

"OK devstatus devmode

"normal""

"NOTIFY devstatus

devmode "normal""

MTX3/MTX5-D/XMV Series/EXi8/EXo8 Remote Control Protocol Specifications V1.0.1

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