Call Signal Connections For Other 4-Wire Communications Systems - RTS SSA-424A User Instructions

4-Wire Call Signal Connections
UIO-256 GPI Outputs Connector (J5)
TABLE 3.
GPI OUTPUT NUMBERS
UIO-256
FRAME #1 FRAME #2
15
16
a. Dependent on UIO-256 DIP Switch SW1 Settings for Input/Output Range as summarized in the UIO-256 manual.
Call Signal Connections for other 4-wire
Communications Systems
4-wire Call Send and Call Enable/Inhibit
The SSA-424A accepts a switch-contact input from the
4-wire system and then generates a call signal output to the
2-wire system. The SSA-424A 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.
FIGURE 6. Typical call send and call enable/inhibit connections for
a 4-wire intercom system.
4-wire Call Receive
The SSA-424A 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-424A 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 a simple contact are shown in Figure 7 on
page 12.
a
UIO-256 UIO-256
FRAME #3
31 47
32 48
RELAY CONTACT PIN NUMBERS
NORMAL
UIO-256 CLOSED (NC)
FRAME #4 CONTACT
63 35
64 36
NORMAL
COMMON OPEN (NO)
CONTACT CONTACT
10 37
11 12
11