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36
a
utomatIon
I
ntegratIon
MAESTRO M9
Command Structure - Issuing
The RS-232 serial control structure of the Maestro M9 is a string of hexa-
decimal values with a minimum of six bytes. When issuing a command,
the structure of the string is as follows: Start Transmission, Zone Number,
Command Code, Data Length, Data and End Transmission. We will use an
abbreviated form for easy reference in the following format:
<ST><ZN><CC><DL><Data><ETR>
Parameter Command Description
s
tArt
0x21
Begins transmission to
Maestro M9
Z
one
n
umber
0x01
Zone 1
0x02
Zone 2
C
ommAnD
C
oDe
See code list
The code of the
command
D
AtA
l
ength
0x01, 0x02 etc…
Number of data parameters
to follow
D
AtA
See code index
The parameters for the
command
ETR
0x0D
End transmission
As an example:
To change the Maestro M9 video source (only video, not audio) in Zone 1
to SAT:
0x21 0x01 0x0A 0x01 0x01 0x0D
To change the source (both audio and video), the command is the 0x08 –
IR simulation command. See page 36 for more info.
Summary of Contents for maestro m9
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