22
INTERCOM AND RELAY CONNECTIONS
If using your DX121 with a wired intercom system, connect the intercom to the
HEADSET/4-WIRE
connector
on the rear panel of the Base Station as shown below. Also, the
RELAY
connector shown below can be used as
a “dry contact” for any outside equipment.
Base Station rear panel showing
HEADSET/4-WIRE
and
RELAY
connectors
Base Station front panel showing
HEADSET
and
4W
(4-Wire) input and output level adjustments
HEADSET/4-WIRE Connector
Pin 1
SPKR
−
Input
Pin 2
SPKR + Input
Pin 3
MIC
−
Output
Pin 4
Headset
connections
MIC + Output
Pin 5
N/C
Pin 6
GND
Pin 7
4-WIRE
−
Output
Pin 8
4-WIRE + Output
Pin 9
4-WIRE
−
Input
Pin 10
4-Wire
connections
4-WIRE + Input
Intercom Headset Connection
If using the headset connector of an intercom, connect the wires from a headset connector (not provided) to
pins 1 through 4 of the
HEADSET/4-WIRE
connector on the rear panel of the Base Station. Be sure the
headset jack of the intercom system is turned on. For intercom headset wiring diagram, see page 34.
4-Wire Intercom Connection
If using a 4-Wire intercom, connect the wires from a 4-Wire connector into the
HEADSET/4-WIRE
connector
on the rear panel of the Base Station. For 4-Wire wiring diagram, see page 34.
Relay Operation
In the default mode, the relay will operate only when the
ISO
button is pressed. In the
IC SEL
mode, the relay
will operate only when the
IC
button is pressed. With either mode, the
IC
button activates audio to the
HEADSET/4-Wire IN/OUT
connector. The
IC SEL
mode is selected by placing a jumper across pins 4 and 5 of
the
RELAY
connector.
RELAY Connector
Pin 1 N.C. (Normally Closed)
Pin 2 COM
Pin 3 N.O. (Normally Open)
Pin 4 IC SEL
Pin 5 GND
NOTE:
Indicated
PinOut connections
should be matched
to the corresponding
PinOut connections
of the intercom
which will be used.
