Crown Audio IQ-PIP-USP2 - Manual (Page 16)

IQ-PIP-USP2
Page 31 IQ-PIP-USP2 Reference Manual
IQ-PIP-USP2
Page 30 IQ-PIP-USP2 Reference Manual
Figure 5.3 Example of “Hub” Style Crown Bus Wiring Arrangement
* Separate shielded pairs may be re-
quired for long runs.
* Because typical mic cables have high
capacitance, the maximum possible
Crown Bus loop distance will be less.
prevent the IQ data signal from
transmitting to nearby audio
wiring. Second, it helps prevent
outside RF from interfering with the
data signal. However, in most
cases interference is not a
problem and, since unshielded
wire has lower capacitance, it is a
better choice.
• Minimize the total capacitance
of each Crown Bus loop. The
total capacitance should be less
than 30 nanofarads. Allow for
approximately 60 picofarads for
each IQ component in a loop. This
accounts for a slight delay which
occurs as data signals pass
through a component.
• Add an IQ Repeater for very long
loops—greater than 1,000 feet
(305 m)—or when required by
high-capacitance wire. Although
we recommend a repeater for
loops longer than 1,000 feet, it is
often possible to go 2,000 feet
(610 m) or more. The most
significant characteristic of the
wire is its capacitance. Lower
capacitance allows longer loops.
Unshielded wire usually has less
capacitance.
• Never use the ground wire in a
mic snake line. It may sometimes
be convenient to run Crown Bus
data signals to and from stage
monitor amplifiers along unused
wire pairs in a mic snake. Do not
use the ground wire which is
normally connected to pin 1 on an
XLR connector or data noise will
be added to the audio lines. Use
only the signal lines which
normally connect to pins 2 and 3 of
the XLRs.*
Outside RF interference is seldom a
problem for a Crown Bus loop—
especially if shielded twisted-pair
wire is used. However, there are
extreme situations when fiber optic
wiring is recommended. For ex-
ample, locating a Crown Bus loop
next to an AM radio transmission
line may require fiber optic cabling.
An extremely long Crown Bus loop
distance may also require fiber op-
tic cabling.
5.2.1 “Hub” Style Crown Bus
Wiring
The Crown Bus can be wired using
a “hub” arrangement, making addi-
tion and removal of IQ components
in the field easier and faster with less
chance of loosing loop integrity. As
in a conventional loop arrangement,
the Crown Bus is wired in a serial
loop, but all IQ components on the
loop are connected at a central patch
panel (see Figure 5.3). Typically Cat5
RJ-45 style patch panels are imple-
mented, and allow the use of off-
the-shelf pass-through network
cable for connecting the IQ-PIP-
USP2 to the patch panel.* The com-
bination input/output Crown Bus con-
nector on the IQ-PIP-USP2 has been
designed specifically for this use.
When wiring the Crown Bus in a hub
arrangement, all unused ports on
the patch panel must be terminated
with shorting plugs to close the loop.
For more information about wiring
the Crown Bus in a hub arrange-
ment, contact Crown Technical
Support.
5.3 Using the AUX
Connector
The IQ System offers tremendous
flexibility and the auxiliary feature
connector provides a means of tap-
ping into it. It can be used to turn
peripherals on/off, send a signal to
another system component, receive
a signal from another component,
and send a line level audio signal of
amplifier’s output.
The AUX connector is an RJ-11 type.
Pins 2 and 5 are used to receive a
signal and pins 3 and 4 are used to
send a signal
.
5.3.1 AUX Output
When the auxiliary feature is turned
on by the IQ for Windows software
+15 VDC is supplied across pins 3
(ground) and 4 (+). A total of 10
milliamps of current is available. A
1.5 K ohm resistor protects against
shorts (See Figure 5.4).
There are many possible uses for
the AUX output. For example, it can
be used to turn on auxiliary cooling
fans. To do this the AUX connector
might be used to close a relay.* The
* A suitable solid-state relay for use in
such a circuit is available from Crown
(CPN D8063-6). Contact your local
Crown representative or the Crown
Factory Parts Department (219-294-
8200) to order.
IN
DIN
IN
DIN
OUT
SHORTING
PLUG FOR
UNUSED
PORTS
OUT
INT II
CAT. 5 PATCH PANEL
USP2 SLM-8 USM 810
STANDARD
THRU-TYPE
NETWORK
CABLE
(CAT.5)