Call Signal Connections For Other 4-Wire Communicaton Systems; 4-Wire Call Send And Call Enable /Inhibit; 4-Wire Call Receive - RTS SSA-424 User Instructions

2.5.2 C S C
ALL IGNAL
W C
IRE OMMUNICATON
2.5.2.1 4-W C S
IRE ALL END AND
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.
DB9F CONNECTOR PIN NUMBERS
(View from solder or crimp side)
1 2 3 4 5
6 7 9
8
CALL ENABLE/INHIBIT
4-WIRE CALL SEND
COMMON
Figure 6. Typical call send and call enable/inhibit connections
for a 4-wire intercom system.
O
ONNECTIONS FOR THER
S
YSTEMS
C E /I
ALL NABLE NHIBIT
CLEAR-COM APPLICATION NOTE:
IF A CALL ENABLE/INHIBIT
SWITCH IS NOT USED, A JUMPER
MUST BE INSTALLED TO ENABLE
CALL SIGNALING. THE JUMPER IS
NOT REQUIRED FOR ANY OTHER
APPLICATION.
4-
2.5.2.2 4-W
IRE
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.
DC COMMON
SSA-424 INTERNAL CIRCUIT FOR CALL SIGNAL
OUTPUT TO 4-WIRE INTERCOM SYSTEM
TO SSA-424 AUX CONNECTOR
DB9F CABLE
(View from solder or crimp side)
SIMPLE SWITCH CONTACT CLOSURE TO 4-WIRE
SYSTEM WHEN 2-WIRE SYSTEM CALLS
AUX CONNECTOR
(SYSTEM A OR B)
DB9F CABLE CONNECTOR PIN NUMBERS
(View from solder or crimp side)
1
6
SYSTEM WHEN 2-WIRE SYSTEM CALLS
OUTPUT SHORTS TO COMMON FOR NO CALL
Figure 7. Call signal connections for a 4-wire intercom system
other than ADAM, ADAM CS, and Zeus.
C R
ALL ECEIVE
AUX
CONNECTOR
(SYSTEM A OR B)
10 Ohm
5 VDC
CONNECTOR PIN NUMBERS
1 2 3 4 5
6 7 8 9
TO 4-WIRE SYSTEM
OPEN CIRCUIT FOR NO CALL
TO SSA-424
2 3 4 5
TO 4-WIRE COMMON
7 8 9
TO 4-WIRE + INPUT
+5VDC SIGNAL TO 4-WIRE
SSA-424 U
PIN 9
PIN 3
PIN 4
PIN 8
PIN 5
M 13
SER ANUAL