Extron Electronics MLC 104 Plus Series - Manual (Page 21)

2-5 MLC 104 Plus Series • Operation, Features, and Cabling
PRELIMINAR
Y
N Not all devices that use RS‑232 for audio level control can be properly controlled
using the MLC’s Volume knob. Some devices cannot respond quickly enough to
the commands issued to them by the MLC.
• If the projector uses range adjustments, that can result in choppy audio level
ramping (volume changing in jumps).
• If the projector uses incremental adjustments (volume up/down commands),
that 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’s volume knob command rate by using
the 49# SIS command (see chapter 4 on SIS programming 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 MLC’s LEDs 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 example below.
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
d
Config (host control) port — This port makes it possible to upload and
configure device drivers and also to initiate IR learning via a front panel
connection after the MLC has been installed.
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 (part #70-335-01) or make your own
cable. See page 2-9 for a wiring diagram and port protocol.
N 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 or a similar
application, make sure the PC connected to these ports is set for 38400 baud.
N Extron recommends configuring and controlling the MLC via the LAN
connector. Ethernet connections are faster and more reliable.