Extron electronics MLC 104 IP Plus Series, User Manual, Page: 20 / 174

MLC 104 IP Plus Series • Operation, Features, and Cabling 12
NOTE:
Not all devices that use RS-232 for audio level control can be properly
controlled using the MLC Volume knob. Some devices cannot respond quickly
enough to the commands issued to them by the MLC.
• If the projector uses range adjustments, it can result in choppy audio level
ramping (volume changing in jumps).
• If the projector uses incremental adjustments (volume up/down commands),
it can result in slow audio ramping (requiring many turns of the knob to change
the volume).
If you experience problems using range-based audio control with a projector or
other device, try slowing down the MLC volume knob command rate by using
the
49# SIS command
(see the special function SIS table on page 106 for
details) or encoder scaling in Global Configurator (see the Global Configurator
Help file). If you need further assistance, contact Extron and ask to speak with an
applications engineer.
If the MLC is configured for use with a MediaLink Switcher or for some projectors,
the LEDs on the MLC indicate volume ranges (with steadily lit LEDs) and minimum/
maximum volume limits (with flashing LEDs), as shown in the following diagram.
VOLUME VOLUME VOLUME VOLUME VOLUME VOLUME VOLUME
Range-based Volume Adjustment
VOLUME VOLUME
Increment/Decrement-based Volume Adjustment
Minimum,
0% of Max.
Volume
1% to 19%
of Max.
Volume
20% to 39%
of Max.
Volume
40% to 59%
of Max.
Volume
60% to 79%
of Max.
Volume
80% to 99%
of Max.
Volume
100% of
Max.
Volume
If the MLC is configured for increment/decrement volume adjustment, the LEDs scroll
up/down briefly. See the following example.
VOLUME VOLUME VOLUME VOLUME VOLUME VOLUME VOLUME
Range-based Volume Adjustment
VOLUME VOLUME
Increment/Decrement-based Volume Adjustment
Minimum,
0% of Max.
Volume
1% to 19%
of Max.
Volume
20% to 39%
of Max.
Volume
40% to 59%
of Max.
Volume
60% to 79%
of Max.
Volume
80% to 99%
of Max.
Volume
100% of
Max.
Volume
Configuration Port
4
Config (host control) port — This port makes it possible to upload and
configure device drivers via serial communication and also to initiate IR learning via
a front panel connection after the MLC has been installed. Overall configuration
requires the use of the rear panel LAN port.
Connect a Windows-based PC or an RS-232 control system to this 2.5 mm mini
stereo-style (tip-ring-sleeve) connector. You can use the Extron 9-pin D to 2.5 mm
stereo mini TRS RS-232 cable or make your own cable. See page
16 for a wiring
diagram and port protocol.
NOTES:
• This port requires 38400 baud communication, a higher speed than many other
Extron products use. The configuration software automatically sets the connection
for the appropriate speed. If using HyperTerminal, DataViewer, or a similar
application, make sure the PC connected to these ports is set for 38400 baud.
• Extron recommends configuring and controlling the MLC via the LAN
connector. Ethernet connections are faster and more reliable.
CONFIG