Crown Audio PSI - Manual (Page 9)

Page 9
IQ–PSI IQ Pocket Serial Interface
4-pin DIN output connector from an IQ P.I.P. to the input
portion of the IQ–PSI .
Figure 3.6 shows how to connect the output portion of
Fig. 3.5 IQ P.I.P. Output Connection to the IQ–PSI Input
Fig. 3.4 IQ–PSI Output Connection to an IQ Mixer Input
Figure 3.4 shows how the output of the IQ–PSI is wired
to an IQ component with a similar connector.
Wiring the output of a similar IQ component back to the
input of the
IQ–PSI is simply the reverse. Note: Be-
cause the IQ–PSI does not have a ground connection,
the shield (if one is used) should be carried through to
the input of the next IQ component with a ground
3 / 16 in
(0.48 cm)
Fig. 3.3 A Screw-Terminal Plug
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 capaci-
tance.
• 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.
Note: Because typical mic cables have high ca-
pacitance, the maximum possible Crown Bus loop
distance will be less.
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 example, locat-
ing a Crown Bus loop next to an AM radio transmission
line may require fiber optic cabling. An extremely long
Crown Bus loop distance (greater than 10 miles) may
also require fiber optic cabling.
There are two different types of connectors used for
Crown Bus wiring. These include DIN connectors and
“Euro-style” screw terminal plugs. The
IQ–PSI uses a 4-
pin male “Euro-style” connector that accepts a comple-
mentary screw-terminal plug like the one shown in
Figure 3.3. Most IQ mixers use these same plugs for
Crown Bus connection.
Fig. 3.6 IQ–PSI Output Connection to an IQ P.I.P. Input
Optional Shield
GND
Note: The IQ–PSI
does not have a
GND connection.
OUT IN
+ – + –
OUT IN
+ – + –
Output (+)
Output (–)
Input (+)
Input (–)
Output (+)
Output (–)
Input (+)
Input (–)
IQ–PSI Output IQ Mixer Input
OUT IN
+ – + –
Output (+)
Output (–)
Input (+)
Input (–)
GND 1
Output (+) 2
Not used 3
Not used 4
IQ–PSI Input IQ P.I.P. Output
2 3
4 1
Note: The IQ–PSI does not have a GND connection.
If a shield is used, it should be carried through to the
input of the next IQ component with a GND terminal.
Optional Shield
Note: The IQ–PSI
does not have a
GND connection.
OUT IN
+ – + –
1 Input (–)
2 Input (+)
3 GND
4 Not used
5 Not used
Output (+)
Output (–)
Input (+)
Input (–)
IQ–PSI Output IQ P.I.P. Input
2
5
3
4
1
Optional Shield
connection.
The next two figures show how to wire components with
different connectors. Figure 3.5 shows how to connect a