Chauvet Tiger DMX 60 Manuel de l'opérateur télécharger pdf (Page 177)

13. Other features - Page 209

Pearl 2008 Manual - 16th July 2007

13.2 MIDI functions

The Pearl can respond to or output MIDI note information which

emulates certain buttons being pressed or faders being moved. The

console can also respond to MIDI Timecode, which is used with script

files.

If you want to know more about MIDI, a good book to read is MIDI

Systems and Control by Francis Rumsey; Published by Focal Press,

ISBN 0-240-513000-2. There’s also a huge amount of information

available on the Internet, try searching for “MIDI specification”.

The MIDI mode is set on the User Settings menu to be MIDI master

(outputs MIDI when you turn on playbacks), MIDI slave (responds to

MIDI) or MIDI disabled. The MIDI channel the Pearl will respond to is

also set on this menu (note that you need to add 1 to the number

displayed by the Pearl to get the actual MIDI channel number).

13.2.1 What a MIDI command looks like

The normal MIDI command is: STATUS BYTE1 BYTE2

Or in binary, 1cccnnnn 0xxxxxxx 0yyyyyyy

ccc = the MIDI command (note on, program change etc)

nnnn = the MIDI channel number (set on the User Settings

menu).

xxxxxxx and yyyyyyy are the data bytes.

MIDI often works in “running status” mode. If a lot of the same type of

command is being sent (lots of note on’s etc.) then the status byte can

be missed out. The receiver knows that if it doesn’t get a status byte, it

just has to run with the last one it received.

13.2.2 MIDI commands used by the Pearl

The Pearl uses standard MIDI commands. The usual name for these is

given in italics. All commands are given in hexadecimal notation ($9n),

where ‘n’ is the MIDI channel number. So a note on command for MIDI

channel 3 for example would be $92.

Set playback page : program change ($Cn xx)

Page

1 2 3 4 5 … 28 29 30

xx $00 $01 $02 $03 $04 … $1B $1C $1D

example $Cn $02 Console changes to Page 3

Turn on a playback: note on ($9n pp ll)

Note number (pp) = playback number, from 0 - 14 (decimal)

Key velocity (ll) = playback level, from 0 - 127 (decimal). 127=Full

example $9n $03 $40 Playback Fader 4 at 50% level.

(Note that Playback Fader numbers start at zero, so subtract one from

the number on the console to get the MIDI note number).

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Chauvet Tiger DMX 60 Manuel de l'opérateur Page 177