Extron Electronics MLA VC10 Plus Setup Guide - Manual (Page 6)

MLA VC10 Plus • Setup Guide (Continued)
6
68-1828-50
Rev. D
06 12
Using Variable Voltage to Control Volume
A few amplifiers cannot be controlled by the potentiometer and must, instead, be
controlled by variable DC voltage. This example shows how to connect the MLA VC10 Plus
to an amplifier that requires a maximum output voltage of 10 VDC.
1. Connect the USB port of the MLA VC10 Plus to a computer with the Extron DataViewer
software installed to send the following SIS commands.
NOTE: • See the MLA VC10 Plus User Guide for information about downloading
and installing DataViewer on your computer.
• Whenever possible, Extron recommends configuring the MLA VC10 Plus
before connecting the unit to the amplifier.
• For a complete description of SIS commands, see the MLA VC10 Plus User
Guide, which is available on the Extron website ( www.extron.com ).
2. Set the MLA VC10 Plus control mode to voltage, using the following command:
E
M*1VLCM
}
3. Ensure that you know the maximum control voltage for your amplifier. In this example,
the maximum voltage output is 10 VDC.
For more information, see the user guide for the amplifier or measure the voltage, as
described in the MLA VC10 Plus User Guide.
4. For other amplifiers, it may be necessary to set the maximum voltage output.
For example, to set the voltage to 7.5 V, using the following command:
E
V*7.50VLCM
}
NOTE: You must include the final 0 in 7.50. The leading 0 (07.50) is optional.
5. Disconnect the USB connection to the computer.
6. Connect the MLA VC10 Plus variable voltage ports to the
amplifier:
z
Connect the ground (G) terminal of the MLA VC10 Plus to
the ground (Gnd) terminal of the amplifier.
z
Connect the control signal voltage (+) terminal of the
MLA VC10 Plus to the signal voltage (Vc) terminal of the
amplifier.
7. Connect the RS-232 controller (see page 4) and power (see
page 5).
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GND Vc
+10V
+ to Vc
G to GND
Extron
MLA VC10 Plus
V-DC
G
Amplifier