Lectrosonics DM1612, Справочное руководство

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DM Series Digital Matrix Processors
Rear Panel Control - Hardware
The DM processor has programmable inputs which
can be used to control a wide variety of functions.
Depending on the function assigned to them, these
inputs may be connected to momentary contact
switches, toggle switches, or potentiometers. When
used with a switch, the inputs are activated by by
connecting them to ground through the switch contacts,
called a “contact closure”. When used with a potentiom-
eter, the inputs respond to the applied voltage, in the
range 0 to 5 VDC.
Another feature of the rear panel control interface are a
set of
programmable outputs which can be set up to
indicate either audio input channel activity or program-
mable input status. Programmable outputs act as an
electronic “contact closure” to ground. When the output
is active, the contact is closed (conducting to ground),
when inactive it is open.
An important application of the rear panel control
interface is to manage what is called the
rear panel
gain for input and output audio channels. This is an
additional gain value that is added to the “main” gain
value for a channel to give the total gain applied. Rear
panel gain is limited to the range -30dB to 0dB, and
therefore is actually intended to function as a variable
attenuator for the audio channel. The purpose is to
allow some amount of gain or level control by the end
user in a safe manner, using one of the programmable
inputs. A typical application of rear panel gain is to
allow adjustment of the level of an audio output (driving
a speaker)
downward from some maximum by means
of turning a potentiometer connected to a program-
mable input which has been set up to use the Analog
Output RP Gain Control function.
Complete details on the use of Rear Panel control is
provided in the Installation Guide and in the GUI pro-
vided with the unit.