McIntosh MX100

11
RS232
The RS232 jack is used to connect the MX100
to automation controller devices with RS232
connectors. To utilize this feature, you will need an
appropriate RS232 Data Cable. The RS232 Data
Cable should be an 1/8 inch (3.5mm) stereo mini
phone plug to a subminiature DB9 connector.
Data In
(DB9-pin2)
Ground
(DB9-pin5)
Data Out
(DB9-pin3)
RS232 DB9 Connector Pin Layout
1. N/C (no connection) 6. N/C
2. Data In (RXD) 7. N/C
3. Data Out (TXD) 8. N/C
4. N/C 9. N/C
5. Gnd
Typical RS232 settings are:
• 8 data bits, no parity and one stop bit
• Baud rate xed at 115,200 bits per second
Wired IR Inputs
The IR Input allows an external IR receiver to be
attached to the MX100. The Input is labeled IR IN.
By attaching an IR receiver using a 3.5mm cable
(see Figure 10), the MX100’s Remote Control can
be used in another location without a line-of-sight to
the MX100’s front IR sensor.
IR Data
Control
Ground
N/C
The IR Input is congured for non-McIntosh IR
sensors such as a Xantech Model DL85K Kit.
If using an external IR receiver for the MAIN
ZONE in the same room as the MX100, you may
wish to disable the front IR sensor, which also
controls the MAIN ZONE. This will avoid potential
timing issues of receiving the Remote Control’s
commands from two different Inputs. The front IR
can be turned on/off in the GENERAL section of the
SETUP MENU.
Setup>GENERAL>RCLock
To use the front panel to disable or enable the IR
sensor (easier using Setup through a browser):
• Press and hold the LEFT Knob for two
seconds to enter the Setup menu
• Rotate the Left Knob until you see
GENERAL on the display
• Press and release the Left Knob
• Rotate the Left Knob until you see SETUP:
GENERAL RC LOCK on the display
• Press and release the Left Knob
• Rotate the Right Knob to select On or Off
RC LOCK ON will disable the front IR sensor so it
will not detect Remote Control input (and possibly
cause interference with a wired IR input). To enable
the IR sensor to detect a Remote Control’s IR data,
set RC LOCK to OFF (the default).
Digital Inputs
There are four digital Inputs in the MX100:
• Two Toslink Optical Inputs
• Two Coaxial Digital Audio Inputs
The two Coaxial Inputs are labeled:
• COAX 1
• COAX 2
The two Optical Inputs are labeled:
• OPT 1
• OPT 2
The default names and assignments can be changed
in setup.
The Optical Inputs require a Digital Optical Audio
Cable Toslink Cable. The Coaxial Inputs use
Digital Audio Coaxial Cables with male RCA type
connectors.
AC Power
This connection is essential. Plug the female end of
the supplied AC Power Cord into the AC connector
located in the rear right corner of the MX100. Plug
the male end of the AC Power Cord into a grounded
and functioning AC outlet.
Balanced Audio Outputs
There are 13 male balanced XLR connections on the
back of the MX100 to accommodate a wide variety
of speaker congurations. Connect balanced XLR
cables to the corresponding powered speakers or
ampliers. Here are the possible connections:
• FR (Front Right)
• FL (Front Left)
• C (Center)
• SR (Surround Right)
Figure 08– Mini plug for RS232 connection
Figure 09– DB9 connector pin layout
Figure 10– IR 3.5mm connector
Figure 11– Setting the Remote Control Lock