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Reference Manual
IQ–P.I.P.-MEM
Programmable Input Processor for IQ Systems
Fig. 4.8 Amplifier Scale Factor Values
and Output Signal Pad Settings
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 system.
• The same IQ address can
be used more than once
(once per loop per model).
Single Loop Advantages (with
IQ-INT II 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
possible.
The IQ–P.I.P.-MEM can be
connected to the Crown Bus with
inexpensive twisted-pair wiring
4.6 A Closer Look at Crown
Bus Wiring
The IQ–P.I.P.-MEM must be con-
nected to a Crown Bus loop having
an IQ2-compatible IQ interface in
order for the IQ System to control
or monitor it. The Crown Bus is a
serial communication loop de-
signed to transmit IQ commands
and data. As implemented in the
IQ–P.I.P.-MEM, it is a 20 milliamp
current loop operating at a BAUD
rate of 38.4 K. The loop must be
unbroken.
If the system includes an IQ–INT II
inter face, it can accept eight
different Crown Bus loops or zones.
Dividing the sound system into
different zones, each with its own
Crown Bus loop, can have several
advantages. The following list
contrasts those advantages with
those of a single loop.
