AudioControl Maestro M8, User Experience Manual

Page: 39 / 50

®
39
a
utoMatIon
I
ntegratIon
M
aestro
M8™
Cable Wiring
The cable wiring to connect the Maestro M8 to your control system will
depend on the RS-232 output connection on the controller. Make certain
that you wire the Transmit Data output on the serial controller to the
Receive Data on the Maestro M8 and vice versa on the Receive Data line
on the controller system. Connect the signal grounds on the control system
and the Maestro M8 together. The RS-232 connection on the Maestro M8
is a DB-9 Male connector, labeled Control and is wired as follows:
Pin 2 Receive Data (RXD)
Pin 3 Transmit Date (TXD)
Pin 5 Ground
To connect the Maestro M8 to a standard PC
serial com port; wire the cable in a ‘null modem’
arrangement using the appropriate serial cable.
Command Structure - Issuing
The RS-232 serial control structure of the Maestro M8 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 M8
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 units
to follow
d
ata
See code index The parameters for the
command
ETR 0x0D End transmission
As an example:
To change the Maestro M8 video source in Zone 1 to SAT:
0x21 0x01 0x0A 0x01 0x01 0x0D