Crown Audio IQ-USM 810 - Manual (Page 33)

Page 33
IQ-USM 810 IQ Digital Processor / Digital Mixer
IQ-USM 810 Reference Manual
Another use for the Control Port outputs might be to
light an LED on an annunciator panel to indicate
preset status, input channel mute, or any other on/off
type function. A sample LED circuit is shown in Fig-
ure 6.10. 6.2.3 Control Port Digital Inputs
The Control Port digital inputs can be used to sense
logic high or low signals to control many of the fea-
tures of the IQ-USM 810. The inputs are current-
driven and will accept +5V or +10V inputs, and are
well suited for sensing contact closure.
One particularly useful way to use the Logic Input
Control Mode is to sense the opening and closing of
switches in a room-combining system. Switches are
mounted in retractable partitions between rooms.
When a partition is opened, the signal at the digital
input will be interpreted as a logic “low,” and when
the partition is closed, the signal at the digital input
will be interpreted as a logic “high.” When specific
mapped combinations of logic low and highs are
sensed, the IQ-USM 810 will activate a preset to
tailor the audio system to the currently configured
space.
Another possible use for the Logic Input Control
Mode is to sense switch closures along the path of a
ride in a theme park to signal the ride's location, and
change to different presets accordingly.
An example of a switch wired to a logic input is
shown in Figure 6.12.
6.2.2 Control Port Analog Inputs
The Control Port analog inputs can be used to
sense the presence of an analog input signal
level. These analog inputs allow the use of ordi-
nary 10 k ohm linear potentiometers for level con-
trol. An example of such a circuit is shown in
Figure 6.11. Analog inputs can alternately be set
to sense simple contact closure.
Figure 6.10 A Sample Control Port Output LED Circuit
Figure 6.11 Sample Control Port Analog Input Circuit
Figure 6.12 Sample Control Port Digital Input Circuit
* Measurement Computing, Corp. (formerly ComputerBoards, Inc.) offers a
suitable screw-terminal board (part number CIO-MINI37) for this use, The
CIO-MINI37 features a male DB-37 connector. Either a DB-37 male to DB-
37 male cable or a gender-changer will be necessary to interface this unit
to the Multi-Function Control Port. Contact Measurement Computing, Corp.
at www.measurementcomputing.com or (508) 946-5100.
A screw-terminal board with barrier-block to DB37M
connections makes it easy to interface external cir-
cuitry to the Multi-Function Control Port.*