Crown Audio IQ-MCA-IQ-MC8 - Manual (Page 17)

Page 17 Reference Manual
IQ-MC Modules
5 IQ Audio In Depth
This section provides additional in-
formation about Crown’s IQ System
with special guides to aid in the
installation and use of the IQ-MC
module. For more information about
any of these topics, contact Crown
Technical Support.
5.1 A Closer Look at IQ Bus
Wiring
The IQ-MC module must be con-
nected to a IQ Bus loop having an
IQ2-compatible IQ interface in or-
der for the IQ System to control or
monitor it. The IQ Bus is a serial
communication loop designed to
transmit IQ commands and data. As
implemented in the IQ-MC, it is a 20
milliamp current loop operating at a
BAUD rate of 38.4 K. The loop must
be unbroken to function properly.
If the system includes an IQ–INT 3
interface, it can accept eight different
IQ Bus loops or zones. Dividing the
sound system into different zones,
each with its own IQ Bus loop, can
have several advantages. The fol-
lowing list contrasts those advan-
tages with those of a single loop.
Multiloop Advantages
• A break in communication in one
loop does not affect other loops.
• Over 250 IQ components of the
same type can be used in a sys-
tem.
• The same IQ address can be
used more than once (once per
loop per model).
Single Loop Advantages
(with IQ-INT 3 interfaces)
• The IQ System can send and
retrieve data faster in a single
loop.
• “Real time” level display of a
greater number of units is pos-
sible.
CH 8
Figure 4.1 MC-IQ
Signal Flow Block Diagram