Crown IQAMB-5, IQSMX-6 manual Using the AUX Port

AMB-5 /SMX-6IQ Mixer/Multiplexer

6.2 Using the AUX Port

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 relay would then turn the fans on or off. This is shown in Figure 6.14.

The solid state relay shown (Crown part number D 7308-7) can be ordered from the Crown Parts Depart- ment.

The Aux port uses a male 3-pin mini XLR connector which is located above the DB9 connector (Figure 2.1). Use a Switchcraft® TA3F cable connector or equivalent to make the connection.

When the Aux port is turned on by the IQ System it provides 10 VDC across pins 3 (+) and 1 (ground). An internal 1.5 K ohm resistor limits the current to a maxi- mum of 16 mA. This is shown below in Figure 6.15.

AUX

CONNECTOR

1

3

GND

10 V

2

110 VAC

INPUT

SOLID

STATE

RELAY

+ –

AUXILIARY

EQUIPMENT

Figure 6.15 Internal Auxiliary Circuit

Notice in Figure 6.15 that the AUX connector can be used to sense the presence of an input signal across pins 2 (+) and 1 (ground). It is a high impedance input

Figure 6.14 Sample Auxiliary System Wiring

and includes a pull-down resistor.

IQ–AMB-5 / IQ–SMX-6 Reference Manual Page 27