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SSA-424 USER MANUAL 13
2.5.2 CALL SIGNAL CONNECTIONS FOR OTHER 4-
W
IRE COMMUNICATON SYSTEMS
2.5.2.1 4-WIRE CALL SEND AND CALL ENABLE/INHIBIT
The SSA-424 accepts a switch-contact input from the
4-wire system and then generates a call signal output
to the 2-wire system. The SSA-424 also accepts an
optional switch contact input to enable or inhibit call
signaling between the 4-wire and 2-wire systems.
Figure 6 shows the typical connections.
2.5.2.2 4-W
IRE CALL RECEIVE
The SSA-424 receives call signals from the 2-wire
system, then converts this to relay contact closure for
use as a 4-wire call receive indication. The SSA-424
also provides +5 VDC which can be connected to the
relay contacts to generate a DC output signal instead
of a contact closure. Connections for simple contact
closure and DC output signal are shown in Figure 7.
✏ The SSA-424 power indicator flashes
whenever a call signal is received from either
2-wire line. This can be used as an incoming
call indication for the 4-wire system, if
desired, and the level display should provide
an indication of which line is calling.
COMMON
4-WIRE CALL SEND
CALL ENABLE/INHIBIT
15432
67
8
9
DB9F
(View from solder or crimp side)
CONNECTOR PIN NUMBERS
CLEAR-COM APPLICATION NOTE:
IF A CALL ENABLE/INHIBIT
SWITCH IS NOT USED, A JUMPER
MUST BE INSTALLEDTO ENABLE
CALL SIGNALING.THE JUMPER IS
NOT REQUIRED FOR ANY OTHER
APPLICATION.
10 Ohm
PIN 4
AUX
CONNECTOR
(SYSTEM A OR B)
PIN 8
PIN 5
PIN 3
PIN 9
5 VDC
DC COMMON
15432
67
8
9
TO SSA-424 AUX CONNECTOR
DB9F CABLE
(View from solder or crimp side)
CONNECTOR PIN NUMBERS
TO 4-WIRE SYSTEM
DB9F CABLE
(View from solder or crimp side)
CONNECTOR PIN NUMBERS
15432
67 89
TO 4-WIRE + INPUT
TO 4-WIRE COMMON
TO SSA-424
AUX CONNECTOR
(SYSTEM A OR B)
SSA-424 INTERNAL CIRCUIT FOR CALL SIGNAL
OUTPUT TO 4-WIRE INTERCOM SYSTEM
+5VDC SIGNAL TO 4-WIRE
SYSTEM WHEN 2-WIRE SYSTEM CALLS
OUTPUT SHORTSTO COMMON FOR NO CALL
SIMPLE SWITCH CONTACT CLOSURE TO 4-WIRE
SYSTEM WHEN 2-WIRE SYSTEM CALLS
OPEN CIRCUIT FOR NO CALL
Figure 6. Typical call send and call enable/inhibit connections
for a 4-wire intercom system.
Figure 7. Call signal connections for a 4-wire intercom system
other than ADAM, ADAM CS, and Zeus.