RTS Intercom System SSA 424 User Guide

User Instructions  
SSA-424  
Dual Digital Hybrid  
ADAM™, ADAM CS™, Zeus™ Intercom Systems  
LEVEL  
SET  
-1  
5
SYSTEM  
A
-1  
2
-9  
-6  
-3  
0
-10dB  
+12dB  
0dB  
P
O
W
+
E
+4dB  
3
R
+
+8dB  
6
2
4W LEVEL  
REF SEL  
+
TO  
9
1
4W  
+
1
2
BAL  
TW C
TO  
LEVEL  
SET  
2W  
1
2
BAL  
-1  
5
SYSTEM  
B
-1  
2
-9  
-6  
-3  
0
-10dB  
+12dB  
0dB  
+
+4dB  
3
+
+8dB  
6
4W LEVEL  
REF SEL  
2
1
+
TO  
9
4W  
+
1
2
BAL  
TW C
TO  
2W  
1
2
BAL  
TM  
S
S
A
-4  
2
4
9350-7638-000 Rev C 10/04  
 
Contents  
1 Description and Specifications ........................................................................................................5  
1.1 GENERAL DESCRIPTION ..................................................................................................................5  
1.2 GENERAL FEATURES .......................................................................................................................5  
1.3 FRONT AND BACK PANEL DESCRIPTIONS ............................................................................................6  
1.3.1 FRONT PANEL .........................................................................................................................6  
1.3.2 BACK PANEL ...........................................................................................................................6  
1.4 SPECIFICATIONS .............................................................................................................................6  
2 Installation .......................................................................................................................................7  
2.1 UNPACKING AND INSPECTING ............................................................................................................7  
2.2 MOUNTING ....................................................................................................................................7  
2.3 4-WIRE AUDIO CONNECTIONS .........................................................................................................7  
2.3.1 ADAM, ADAM CS, OR ZEUS AUDIO CONNECTION .....................................................................7  
2.3.2 AUDIO CONNECTIONS FOR OTHER 4-WIRE COMMUNICATIONS SYSTEMS .............................................7  
2.4 2-WIRE AUDIO CONNECTIONS ..........................................................................................................9  
2.4.1 RTS TW AUDIO CONNECTIONS .................................................................................................9  
2.4.2 AUDIOCOM AUDIO CONNECTION .................................................................................................9  
2.4.3 CLEAR-COM AUDIO CONNECTION .............................................................................................10  
2.4.4 OTHER 2-WIRE AUDIO CONNECTION..........................................................................................10  
2.5 4-WIRE CALL SIGNAL CONNECTIONS ...............................................................................................11  
2.5.1 CALL SIGNAL CONNECTIONS FOR ADAM, ADAM CS, AND ZEUS .................................................11  
2.5.2 CALL SIGNAL CONNECTIONS FOR OTHER 4-WIRE COMMUNICATON SYSTEMS ...................................13  
2.5.2.1 4-WIRE CALL SEND AND CALL ENABLE/INHIBIT .....................................................................13  
2.5.2.2 4-WIRE CALL RECEIVE .....................................................................................................13  
2.6 2-WIRE CALL SIGNAL ..................................................................................................................14  
2.6.1 CALL SIGNAL CONNECTIONS FOR AUDIOCOM, RTS TW AND CLEAR-COM ......................................14  
2.6.2 CALL SIGNAL CONNECTIONS FOR OTHER 2-WIRE COMMUNICATION SYSTEM ....................................14  
3 Operation ......................................................................................................................................15  
3.1 GENERAL INSTRUCTIONS ...............................................................................................................15  
3.2 OPERATING NOTES FOR ADAM, ADAM CS, AND ZEUS INTERCOM SYSTEMS .........................................15  
4 Appendix .......................................................................................................................................16  
4.1 INTERNAL ACCESS........................................................................................................................16  
4.2 MODE DIP SWITCH SETTINGS ........................................................................................................16  
4.3 LEVEL DISPLAY CALIBRATION .........................................................................................................16  
4.4 CALL SIGNAL OPTION CARD INSTALLATION .......................................................................................17  
SSA-424 USER MANUAL 3  
 
4 SSA-424 USER MANUAL  
 
Peak Reading Level Meters: Quick and accurate  
visual audio level adjustment. No extra setup equip-  
ment or guesswork is required.  
1
Description and  
Specifications  
GENERAL DESCRIPTION  
1.1  
The SSA-424 Dual Digital Hybrid intervaces two, 2-  
wire intercom lines to two, 4-wire intercom lines.  
Unlike earlier analog hybrids, the SSA-424 features  
advanced digital signal processing to achieve  
automatic nulling of the 2-wire lines. Plus, each  
hybrid features convenient peak-reading level  
meters to quickly match the levels between the lines  
that are being interfaced. The result is easy and  
accurate setup. With the SSA-424, all need for test  
tones, nulling adjustments and ducking adjustments  
have been eliminated.  
Direct ADAM/Zeus Audio Connection: Accepts  
standard ADAM/Zeus DB9 or RJ11 keypanel cables.  
Transformer Isolated: All audio inputs and outpus  
are transformer isolated to prevent ground loops and  
hum.  
Call Signal Option: Detects call signals from any of  
the compatible 2-wire intercom systems, and then  
provides a +5VDC output to the 4-wire intercom  
system. Accepts a contact closure input from the 4-  
wire system and converts it to the call signal format  
required by the 2-wire system. The SSA-424 can be  
directly connected to an ADAM, ADAM CS, or Zeus  
GPI (General Purpose Interface). GPI inputs can be  
programmed to activate call signals and audio paths  
to any of the available types of communication within  
the 4-wire system, including intercom ports, camera  
ISO circuits, IFB circuits, etc. GPI outputs can be set  
up to place calls only from a specific keypanel within  
the 4-wire system, or from any keypanel within the 4-  
wire system that wishes to call the 2-wire system.  
Compatible 2-wire intercom systems include RTS™  
TW, Audiocom®, and Clear-Com®. Compatible 4-  
wire intercom systems include Telex’s ADAM™,  
ADAM™CS, and Zeus™ Digital Matrix Intercom  
Systems.  
The SSA-424 is also available with optional call  
signal interfacing. This option provides bidirectional  
call signal compatibility between the 2-wire and 4-  
wire intercom systems.  
With features like digital signal processing, peak-  
reading level meters and optional call signal interfac-  
ing, the SSA-424 Dual Digital Hybrid assures ease  
of setup and maximum transparency between  
intercom systems.  
Half-rack Wide, 1RU High: Two SSA-424’s fit into a  
single rack space. Compatible with RTS TW rack  
mount hardware. Can be mixed with other TW  
equipment.  
Universal Power Pack: Ready for worldwide use.  
Automatically accepts any mains voltage from 100-  
250 VAC, 50/60 Hz. Power pack equipped with  
locking DIN connector for attachment to the SSA-  
424.  
1.2 GENERAL FEATURES  
Two Independent Hybrids: Interface two separate  
2-wire lines to two separate 4-wire lines.  
Automatic Nulling: Digital hybrids eliminate all  
nulling and ducking adjustments. Quick, trouble-free  
setup. Puts an end to concerns about echo and  
feedback when interfacing 2-wire lines.  
LEVEL  
SET  
LEVEL  
SET  
SYSTEM A  
SYSTEM B  
TO  
TO  
4W  
4W  
-15 -12 -9 -6 -3  
0
+3 +6 +9 +12  
2W CHAN SEL  
0
+3 +6 +9  
+12  
-15 -12 -9 -6 -3  
TO  
2W  
TO  
2W  
+4dB  
2
+4dB  
2
2W CHAN SEL  
0dB  
+8dB  
1
BAL  
OFF  
0dB  
+8dB  
1
BAL  
OFF  
-10dB  
+12dB OFF  
-10dB  
+12dB OFF  
1
2
BAL  
1
2
BAL  
TM  
4W LEVEL  
REF SEL  
4W LEVEL  
REF SEL  
POWER  
SSA-424  
Telex Communications, Inc., Made in U.S.A.  
AUX  
AUX  
J4A  
J3A  
J5 POWER  
+5V 3A  
+15V 1.6A  
-15V 0.3A  
J4B  
J3B  
+5V  
+15V  
RTN  
-15V  
J1B  
J1A  
2 WIRE SYSTEM  
RTN  
J2A  
J2B  
4 WIRE SYSTEM  
4 WIRE SYSTEM  
Figure 1. SSA-424 Reference View  
SSA-424 USER MANUAL 5  
 
1.3  
FRONT AND BACK PANEL DESCRIPTIONS  
1.4  
SPECIFICATIONS  
1.3.1 FRONT PANEL  
2-Wire Ports  
Input/Output Impedance: 5,000 ohms, nominal  
There is a power ON/OFF and call indicator at the left  
of the front panel. This indicator lights continuously  
when the SSA-424 is turned on and flashes when an  
incoming call signal is detected. The remainder of  
the front panel is divided into controls and indicators  
for the two separate hybrids, labeled SYSTEM A and  
SYSTEM B. For each hybrid, there is a 10-segment,  
peak reading level meter to display the 4-wire output  
level (TO 4W). There is a recessed level set control  
to the left of the 4-wire meter (LEVEL SET) and there  
is also a recessed, 5-position range select control for  
the 4-wire output (4W LEVEL REF SEL). Under the  
4-wire meter, is an identical meter for the 2-wire  
output level, and there is a recessed level set control  
for the 2-wire output to the left of the meter. Under  
the 2-wire meter, there is a recessed, 5-position  
selector. The selector has two OFF positions for  
when no 2-wire input is connected. The three  
remaining switch positions select the 2-wire system  
as follows: position 1 selects RTS TW channel 1;  
position 2 selects RTS TW channel 2 or a Clear-Com  
channel; the BAL position selects an Audiocom  
balanced channel. There are 3 LED indicators to  
display the current selection (2W CHAN SEL).  
Operating Level: -10dBu to 0 dBu, nominal  
Level Adjustment Range: ±12dB  
4-Wire Ports  
Input Impendance: 10k ohms, nominal  
Output Impedance: 200 ohms  
Operating Levels: -10 dBu, 0 dBu, +4 dBu, +8  
dBu, +12 dBu  
System to System  
Frequency Response:200 Hz to 4.5 kHz, +1/-6dB  
S/N Ratio (Ref 1 kHz, 0 dB@2-wire): TBD  
Crosstalk: TBD  
Environmental  
Operating Temp: -20°C to 50°C (-4°F to 122°F)  
Storage Temp: -40°C to 85°C (-40°F to 185°F)  
Humidity: 0 to 95%, non-condensing  
Mains Voltage  
100 to 250 VAC, 50/60 Hz  
Dimensions  
1.72” (44mm) high x 8.19” (208mm) wide x 8.0”  
(204mm) deep  
1.3.2 BACK PANEL  
The power pack connector is located at the right end  
of the back panel. This is a locking DIN connector.  
The remainder of the back panel is divided into  
connectors for the two separate hybrids. Connectors  
are labeled with “J” numbers followed fy “A” or “B” to  
indicate system A or system B. For each hybrid,  
there is an AUX connector. This is used to connect  
to/from the optional call signal card. Below the AUX  
connector, there are both a DB9F connector and an  
RJ11 connector for 4-wire intercom connection.  
These are directly compatible with standard ADAM/  
Zeus keypanel cables. Next to the 4-wire connectors,  
there is a 3-pin female XLR audio connectorfor  
connection to the 2-wire intercom system. The pin-  
out of this connector is determined by the position of  
the TW CHAN SEL control on the front panel.  
Weight  
5.0 lbs (2.3kg)  
Finish  
Thermoplastic front panel, almunimum case, light  
gray finish  
Approvals  
UL, CSA, UDE, CE  
Specifications subject to change without notice.  
6 SSA-424 USER MANUAL  
 
2.3.2 AUDIO CONNECTIONS FOR OTHER 4-WIRE  
COMMUNICATIONS SYSTEMS  
1 Construct 9-pin or RJ11 cables to connect from  
you 4-wire system to the SSA-424. To connect to  
the System A hybrid, use either J2A or J3A; for  
the System B hybrid, use either J2Bor J3B. Pin  
connections are as follows:  
2
2.1  
Installation  
UNPACKING AND INSPECTING  
Immediately upon receipt of the equipment, carefully  
inspect the shipping container and the contents for  
any discrepancies or damage. Should there be any,  
notify the freight company and the dealer at once.  
The following items are included:  
9-Pin Connection  
Connector Type (on SSA-424 end of cable): 9-pin  
male D-subminiture  
Qty  
1
1
1
1
Description  
SSA-424 Dual Digital Hybrid  
Power Pack with cord,100-250 VAC, 50/60Hz  
Warranty Card  
Pin 1:  
Pin 2:  
Pin 3:  
Pin 4:  
No connection  
No connection  
No connection  
Balanced Audio + output (to 4-wire  
system)  
User Instruction Manual  
2.2  
MOUNTING  
Place the SSA-424 on a desktop, or install it in an  
equipment rack using an RTS MCP Rack Mount Kit.  
Several rack mount options are available (Figure2,  
page 8). There are no special ventilation require-  
ments for the SSA-424, but allow for ventilation  
around the power pack.  
Pin 5:  
Balanced Audio - output (to 4-wire  
system)  
Pin 6:  
No connection  
Pin 7:  
Balanced Audio - input (from 4-wire  
system)  
Pin 8:  
system)  
Pin 9:  
Balanced Audio + input (from 4-wire  
No connection  
If the SSA-424 has the call signal option, the  
power indicator flashes whenever a call  
signal is received from either 2-wire line, and  
activity on the level display helps to indicate  
which line is calling. If the SSA-424 is  
positioned near the 4-wire operator, this can  
be used as an incoming call indication for the  
4-wire system, if desired (although other  
methods are available as described in  
paragraph 2.5).  
RJ11 Connection  
Connector Type (on SSA-424 end of cable):  
RJ11 plug  
Pin 1:  
Pin 2:  
No connection  
Balanced Audio + input (from 4-wire  
system)  
Pin 3:  
Pin 4:  
Pin 5:  
Pin 6:  
Balanced Audio + output (to 4-wire  
system)  
Balanced Audio - output (to 4-wire  
system)  
Balanced Audio - input (from 4-wire  
system)  
No connection  
You may wish to read about the internal  
mode DIP switches before mounting the  
SSA-424. For further information, see Mode  
Switch Settings, page 16.  
2.3  
4-WIRE AUDIO CONNECTIONS  
2.3.1 ADAM, ADAM CS, OR ZEUS AUDIO  
CONNECTION  
2 On the SSA-424 front panel, set the 4W LEVEL  
REF SEL switches to the position which most  
closely matches the audio input and output levels  
of your 4-wire system. If you don’t know the  
levels, select +4dB for now.  
1 Use standard 9-pin or RJ11 keypanel cables.  
Connect from one port of your intercom system  
to J2A or J3A (System A connection) on the  
back of the SSA-424. Connect from another  
port to J2B or J3B (System B connection).  
2 On the SSA-424 front panel, set the 4W  
LEVEL REF SEL switches to the +8dB posi-  
tion.  
SSA-424 USER MANUAL 7  
 
Side-By-Side Rack Mount Configuration Using an MCP1 Rack Mount Kit  
Single-unit Rack Mount Configuration Using an MCP2 Rack Mount Kit  
Console Mount Configuration Using an MCP3 Console Mount Kit  
Tandem Configuration Using an MCP4 Tandem Mount Kit  
Figure 2. Rack mount configurations  
8 SSA-424 USER MANUAL  
 
2.4.2 AUDIOCOM AUDIO CONNECTION  
1 You can directly connect standard Audiocom 1-  
channel cables. Connect one Audiocom channel  
to the J1A connector on the back of the SSA-424  
(System A). Connect a second Audiocom  
channelto the J1B connector (System B). If your  
Audiocom system uses 2-channel cables, use a  
JB-2 Junction Box to split the channels (Figure  
4).  
2.4  
2-WIRE AUDIO CONNECTIONS  
2.4.1 RTSTW AUDIO CONNECTIONS  
1 Use standard TW intercom cables. Note, stan-  
dard TW system cables can carry either one or  
two channels, while each hybrid in the SSA-424  
can only interface one TW channel to one 4-wire  
channel (which channel is determined by the  
front panel 2W CHAN SEL switch). If your TW  
system cable is only carrying one channel, or if  
you only need to connect one of two channels,  
connect directly to J1A (System A) or J1B  
The SSA-424 features internal DC isolation.  
You cn therefore connect the SSA-424 to  
powered Audiocom cables, and it will not  
draw any power from the Audiocom system.  
(System B). If you TW system cable is carrying  
two channels, and you want to connect both, use  
a TW-5W or similar device as shown in Fig. 3.  
2 On the SSA-424 front panel, set the 2W CHAN  
SEL switches for System A and System B to the  
BAL position.  
The SSA-424 features internal DC isolation.  
You can therefore connect the SSA-424 to  
powered TW cables, and it will not draw any  
power from the TW system.  
If the System A or System B hybrid will not  
be used, set its 2W CHAN SEL switch to  
either OFF position.  
2 On the SSA-424 front panel: For each hybrid  
(System A or System B) set the 2W CHAN SEL  
switch to the appropriate position. To interface to  
TW channel 1, select position 1; for TW channel  
2, select position 2.  
CH 1 AND 2  
FROM AUDIOCOM  
INTERCOM SYSTEM  
If the System A or System B hybrid will not  
be used, set its 2W CHAN SEL switch to  
either OFF position.  
L I N E S 1 & 2  
L I N E 2  
L I N E 1  
JB-2  
TW CABLE PIN-OUT  
PIN 1 COMMON  
PIN 2 CH 1  
PIN 3 CH 2  
FROM RTS TW  
INTERCOM SYSTEM  
CH 2  
CH 1  
SSA-424  
AUX  
PUSH  
Telex Communications, Inc., Made in U.S.A.  
AUX  
J4B  
J5 POWER  
+5V 3A  
+15V 1.6A  
-15V 0.3A  
TW-5W  
J4A  
+5V  
+15V  
RTN  
-15V  
J1B  
J1A  
WIRE SYSTEM  
J3B  
4
J3A  
RTN  
J2B  
WIRE SYSTEM  
J2A  
2
4
WIRE SYSTEM  
Figure 4. Using a JB-2 Junction Box to split a 2-channel  
Audiocom cable into two 1-channel cables.  
Telex Communications, Inc., Made in U.S.A.  
AUX  
J4B  
AUX  
J4A  
J5 POWER  
+5V 3A  
+15V 1.6A  
-15V 0.3A  
SSA-424  
+5V  
+15V  
RTN  
-15V  
J1B  
J1A  
WIRE SYSTEM  
J3B  
4
J3A  
RTN  
J2B  
WIRE SYSTEM  
J2A  
2
4
WIRE SYSTEM  
Figure 3. Using aTW-5W to connect twoTW channels to the  
SSA-424.  
SSA-424 USER MANUAL 9  
 
2.4.3 CLEAR-COM AUDIO CONNECTION  
1 Use standard Clear-Com 3-pin cables. Connect  
one Clear-Com party line to the J1A connector  
on the back of the SSA-424 (System A). Con-  
nect a separate Clear-Com party line to the J1B  
connector (System B).  
2.4.4 OTHER 2-WIRE AUDIO CONNECTION  
1 Use the J1A connector on the back of the SSA-  
424 to connect one 2-wire line to the System A  
hybrid. Use the J1B connector to connect a  
second 2-wire line to the System B hybrid. The  
pin configuration for the J1A and J1B connectors  
depends on whether you are connecting a  
balanced or unbalanced 2-wire line:  
The SSA-424 features internal CD isolation.  
You can therefore connect the SSA-424 to  
powered Clear-Com cables, and it will not  
draw any power from the Clear-Com system.  
Balanced Configuration  
Pin 1:  
Pin 2:  
Pin 3:  
No connection  
Balanced Audio + Input/Output  
Balanced Audio - Input/Output  
2 On the SSA-424 front panel, set the System A  
and System B 2W CHAN SEL switches to  
position 2.  
There are two possible configurations for unbal-  
anced connection:  
If the System A or System B hybrid will not  
be used, set its 2W CHAN SEL switch to  
either OFF position.  
Unbalanced Configuraton 1  
Pin 1:  
Pin 2:  
Pin 3:  
Audio Common  
Audio + Input/Output  
No connection  
Unbalanced Configuration 2  
Pin 1:  
Pin 2:  
Pin 3:  
Audio Common  
No connection  
Audio + Input/Output  
2 On the SSA-424 front panel, set the CHAN SEL  
switches as follows:  
Balanced Configuration: set the CHAN SEL  
switches to the BAL position  
Unbalanced Configuration 1: set the CHAN  
SEL switches to position 1.  
Unbalanced Configuration 2: set the CHAN  
SEL switches to position 2.  
If the System A or System B hybrid will not  
be used, set its 2W CHAN SEL switch to  
either OFF position.  
10 SSA-424 USER MANUAL  
 
Table 1. GPI Connector Pin-out  
(ADAM, ADAM CS, and Zeus)  
2.5  
4-WIRE CALL SIGNAL CONNECTIONS  
These connections require the call signal  
option.  
Pin No.  
Function  
2.5.1 CALL SIGNAL CONNECTIONS FOR ADAM,  
ADAM CS, AND ZEUS  
You can use the General Purpose Interface (GPI)  
connector to interface call signals. The pin-out of the  
connector is the same for all of these intercom  
systems (Table 1).  
1
GPI Input #1 High (5-18 VDC)  
GPI Input #2 High (5-18 VDC)  
GPI Input #3 High (5-18 VDC)  
GPI Input #4 High (5-18 VDC)  
GPI Input #5 High (5-18 VDC)  
GPI Input #6 High (5-18 VDC)  
GPI Input #7 High (5-18 VDC)  
GPI Input #8 High (5-18 VDC)  
Common*  
2
3
4
5
ADAM GPI Connector: XCP-ADAM-MC, J11  
ADAM CS GPI Connector: J903  
Zeus GPI Connector: J27  
6
7
If your intercom system is equipped with a UIO-256  
Universal Input/Output Frame, you can also use that  
for connections (Tables 2 and 3, page 12).  
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
Common*  
As an alternative to using the GPI, you can use  
external components to send and receive call signals  
as described in paragraph 2.5.2.  
Common*  
Common*  
Common*  
GPI Out #1  
Typical GPI connections are shown in Figure 5.  
Note, the example uses GPI outputs #1 and #2 and  
GPI input #1. You may substitute other GPI inputs  
and outputs.  
GPI Out #2  
GPI Out #3  
GPI Out #4  
GPI Out #5  
IMPORTANT NOTE FOR AZEDIT USERS: AZedit  
version 1.06 includes a feature which allows you to  
invert the action of the GPI outputs. By default, these  
outputs are set to duplicate the actio of the RTS  
FR9528 Relay Frame accessory. This is the correct  
setting for use with the SSA-424. To check the  
AZedit setting, select Intercom Configuration in the  
Options menu. Click on the Options tab, then verify  
that Configure onboard GPI outputs in FR9528  
GPI Out #6  
GPI Out #7  
GPI Out #8  
Common*  
Common*  
Common*  
Common*  
mode is selected.  
TO SSA-424  
*Use any available common pin with any GPI input or  
output.  
AUX CONNECTOR  
(SYSTEM A OR B)  
DB9F CABLE CONNECTOR PIN NUMBERS  
(View from solder or crimp side)  
CLEAR-COM APPLICATION NOTE: IF A  
CALL ENABLE/INHIBIT SWITCH IS NOT  
USED, A JUMPER MUST BE  
1
2
3
4
5
TO GPI IN COMMON  
6
7
8
9
INSTALLED TO ENABLE CALL SIGNALING.  
THE JUMPER IS NOT REQUIRED FOR  
ANY OTHER APPLICATION.  
TO GPI IN #1 (4-WIRE CALL RECEIVE INPUT)  
FROM GPI OUT #2 (OPTIONAL CALL ENABLE/INHIBIT CONTROL)  
FROM GPI OUT #1 (4-WIRE CALL SEND OUTPUT)  
GPI OUT COMMON (SEE UIO-256 APPLICATION NOTE)  
UIO-256 APPLICATION NOTE: GPI OUT - AT THE UIO-256 END, USE THE NORMAL OPEN (NO) CONTACT  
FOR GPI OUT CONNECTION, AND USE THE RELAY COMMON CONTACT FOR THE COMMON CONNECTION.  
GPI IN - USE THE INPUT HIGH PIN FOR THE GPI IN CONNECTION, AND USE THE COMMON PIN FOR THE  
COMMON CONNECTION.  
Figure 5. Call signal connections for ADAM, ADAM CS, or Zeus Intercom Systems. This example usesGPI outputs #1 and #2 and  
GPI input #1; however, you may use any other available GPI inputs and outputs. The Call Enable/Inhibit connection is optional. It gives  
you the ability to disable call signaling using a GPI output. However, when connecting to a Clear-Com intercom system, if an enable/  
inhibit switch is not connected, a jumper must be installed as shown to enable call signaling. The jumper should not be installed for any  
other application. Note, you DO NOT have to use GPI outputs for call signaling or call enable/inhibit: you can use simple switches instead  
as shown in Figure 6.  
SSA-424 USER MANUAL 11  
 
Table 2. UIO-256 GOI Inputs Connector (J7)  
GPI Input Numbers* GPI Input Pin Numbers  
UIO-256  
Frame #1  
UIO-256  
Frame #2  
UIO-256  
Frame #3  
UIO-256  
Frame #4  
Input Hight  
(5-18 VDC)  
Common  
1
2
3
4
17  
18  
19  
20  
33  
34  
35  
36  
49  
50  
51  
52  
9
34  
35  
36  
37  
10  
11  
12  
5
6
7
8
21  
22  
23  
24  
37  
38  
39  
40  
53  
54  
55  
56  
13  
14  
15  
16  
38  
39  
40  
41  
9
25  
26  
27  
28  
41  
42  
43  
44  
57  
58  
59  
60  
1
2
3
4
26  
27  
28  
29  
10  
11  
12  
13  
14  
15  
16  
29  
30  
31  
32  
45  
46  
47  
48  
61  
62  
63  
64  
5
6
7
8
30  
31  
32  
33  
* Dependent on UIO-256 DIP Switch SW1 Settings for Input/Output Range as summarized in  
the UIO-256 Manual  
Table 3. UIO-256 GPI Outputs Connector (J5)  
GPI Output Numbers*  
Relay Contact Pin Numbers**  
Normal  
Closed  
(NC) Contact  
Common  
Contact  
Normal Open  
(NO) Contact  
UIO-256 #1  
UIO-256 #2  
UIO-256 #3  
UIO-256 #4  
1
2
3
4
17  
18  
19  
20  
33  
34  
35  
36  
49  
50  
51  
52  
38  
39  
41  
42  
13  
14  
16  
17  
40  
15  
43  
18  
44  
45  
47  
48  
5
6
7
8
21  
22  
23  
24  
37  
38  
39  
40  
53  
51  
55  
56  
19  
20  
22  
23  
46  
21  
49  
24  
9
25  
26  
27  
28  
41  
42  
43  
44  
57  
58  
59  
60  
26  
27  
29  
30  
1
2
4
5
28  
3
31  
6
10  
11  
12  
13  
14  
15  
16  
29  
30  
31  
32  
45  
46  
47  
48  
61  
62  
63  
64  
32  
33  
35  
36  
7
8
10  
11  
34  
9
37  
12  
* Dependent on UIO-256 DIP Switch SW1 Settings for Input/Output Range as summarized in the UIO-256 manual.  
12 SSA-424 USER MANUAL  
 
2.5.2 CALL SIGNAL CONNECTIONS FOR OTHER 4-  
WIRE COMMUNICATON SYSTEMS  
2.5.2.2 4-WIRE 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.  
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.  
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  
DB9F CONNECTOR PIN NUMBERS  
(View from solder or crimp side)  
CLEAR-COM APPLICATION NOTE:  
IF A CALL ENABLE/INHIBIT  
desired, and the level display should provide  
an indication of which line is calling.  
1
2
3
4
5
SWITCH IS NOT USED, A JUMPER  
MUST BE INSTALLED TO ENABLE  
CALL SIGNALING. THE JUMPER IS  
NOT REQUIRED FOR ANY OTHER  
APPLICATION.  
AUX  
CONNECTOR  
(SYSTEM A OR B)  
6
7
9
8
10 Ohm  
5 VDC  
PIN 9  
CALL ENABLE/INHIBIT  
4-WIRE CALL SEND  
COMMON  
PIN 3  
PIN 4  
PIN 8  
PIN 5  
DC COMMON  
Figure 6. Typical call send and call enable/inhibit connections  
for a 4-wire intercom system.  
SSA-424 INTERNAL CIRCUIT FOR CALL SIGNAL  
OUTPUT TO 4-WIRE INTERCOM SYSTEM  
TO SSA-424 AUX CONNECTOR  
DB9F CABLE CONNECTOR PIN NUMBERS  
(View from solder or crimp side)  
1
2
3
4
5
6
7
9
8
TO 4-WIRE SYSTEM  
SIMPLE SWITCH CONTACT CLOSURE TO 4-WIRE  
SYSTEM WHEN 2-WIRE SYSTEM CALLS  
OPEN CIRCUIT FOR NO CALL  
TO SSA-424  
AUX CONNECTOR  
(SYSTEM A OR B)  
DB9F CABLE CONNECTOR PIN NUMBERS  
(View from solder or crimp side)  
1
2
3
4
5
TO 4-WIRE COMMON  
TO 4-WIRE + INPUT  
6
7
8
9
+5VDC SIGNAL TO 4-WIRE  
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.  
SSA-424 USER MANUAL 13  
 
2.6  
2-WIRE CALL SIGNAL  
2.6.1 CALL SIGNAL CONNECTIONS FOR AUDIOCOM,  
RTSTW AND CLEAR-COM  
The call signals are superimposed on the audio  
signal, so no separate call signal connections are  
required. However, make sure that a call enable  
switch or jumper is installed for Clear-Com applica-  
tions as shown in Figures 5 and 6.  
2.6.2 CALL SIGNAL CONNECTIONS FOR OTHER 2-  
WIRE COMMUNICATION SYSTEM  
Any other 2-wire device must be able to generate  
and receive a 20kHz signal superimposed on the  
audio as follows:  
Balanced Audio Configuration  
Pin1:  
Pin 2:  
Pin 3:  
No connection  
Balanced 20 kHz + Input/Output  
Balanced 20 kHz - Input/Output  
SSA-424 Signal Specifications for balanced configu-  
ration:  
SSA-424 Receive: 20kHz ±100 Hz, 100mV p-p  
SSA-424 Send: 20 kHz ±800 Hz, 1V p-p  
Unbalanced Configuration 1  
Pin 1:  
Pin 2:  
Pin 3:  
20 kHz Common  
20 kHz Input/Output  
No connection  
Unbalanced Configuration 2  
Pin 1:  
Pin 2:  
Pin 3:  
20 kHz Common  
No connection  
20 kHz Input/Output  
SSA-424 Signal Specifications for unbalanced  
configurations:  
SSA-424 Receive: 20 kHz ±100 Hz, 0.3Vrms  
SSA-424 Send: 20 kHz ±200 Hz, 100m Vrms  
14 SSA-424 USER MANUAL  
 
Another solution is to assign a dedicated key as  
a UPL resource key (which you could name  
CALL). Then for each key that talks to an SSA-  
424 hybrid, create a UPL statement that will  
activate (assert) the appropriate GPI whenever  
the call key AND the talk key are pressed. This  
lets you use the same call key with more than  
one GPI. To use this, you simply activate the call  
key and the appropriate talk key. Then, when a  
verbal response is received, release the call key.  
3
3.1  
Operation  
GENERAL INSTRUCTIONS  
1 Attach the power pack to the SSA-424, and apply  
power to all components. Confirm that the power  
indicator is lit on the SSA-424 front panel.  
2 The power indicator flashes when a call signal is  
received fron a 2-wire line. The SSA-424 level  
displays should help to confirm which line is  
calling.  
4 Optional call signal input using the GPI  
3 Use the level adjust trimmers (Figure 8) to fine  
adjust the listen levels.  
A. In AZedit, click GPI In on the toolbar.  
This opens the GPI Setup screen.  
B. Whichever GPI Input you are using for 4-wire  
call receive, select that GPI input from the list  
(double-click). This will open the Edit GPI  
Input window.  
C. In the Port Alpha list box, select the intercom  
port that you named in step 1.  
D. In the Key Number box, type 1. This selects  
key 1 at the intercom port that you selected  
in step C.  
For 4-wire systems other than ADAM, ADAM  
CS, and Zeus, you may have to change the  
setting of the 4W LEVEL REF SEL control to  
establish the correct level. For 2-wire  
systems other than Audiocom, TW, and  
Clear-Com, you may have to adjust the level  
at the 2-wire system if you cannot establish  
the correct level with the 2-wire listen level  
trimmers.  
E. Select Talk Key.  
4-WIRE LISTEN LEVEL ADJUSTMENT  
F. Click Done.  
G. Access keypanel setup, and select the same  
intercom port that you selected in step C.  
H. Make sure the setup page Main is selected.  
I. Assign talk key number 1 to talk to the  
intercom port that you setup in step 2. We  
also recommend that you assign auto-listen  
(AL) to the listen key above that talk key.  
LEVEL  
SET  
LEVEL  
SET  
SYSTEM A  
SYSTEM B  
TO  
TO  
4W  
4W  
-15 -12 -9 -6 -3  
0
+3 +6 +9 +12  
2W CHAN SEL  
0
+3 +6 +9 +12  
2W CHAN SEL  
-15 -12 -9 -6 -3  
TO  
TO  
2W  
2W  
+4dB  
2
+4dB  
2
0dB  
-10dB  
+8dB  
1
BAL  
OFF  
0dB  
-10dB  
+8dB  
1
BAL  
OFF  
+12dB OFF  
+12dB OFF  
1
2
BAL  
1
2
BAL  
4W LEVEL  
REF SEL  
4W LEVEL  
REF SEL  
TM  
POWER  
SSA-424  
2-WIRE LISTEN LEVEL ADJUSTMENT  
Figure 8. Location of level adjust trimmers  
3.2  
OPERATING NOTES FOR ADAM, ADAM  
CS, AND ZEUS INTERCOM SYSTEMS  
5 Optional call enable control. If you connected a  
GPI output for use as a call enable control, you  
can assign that GPi output to any intercom key in  
the 4-wire intercom system. If System A is  
connected to an Audiocom or TW intercom  
system, pressing the key will disable call signal-  
ing. (However, the effect is the opposite if a  
Clear-Com system is connected: pressing the  
key will disable the signaling.)  
1 In AZedit use port alpha setup to name each 4-  
wire intercom port that is connected to the SSA-  
424. Choose names which help indicate which  
2-wire line is being interfaced.  
2 Key assignment, party line assignment, etc. is  
the same as for any other intercom port.  
3 Optional call signal output using the GPI: ou can  
assign the GPI output to a talk or listen key, then  
activate that key to generate a call signal.  
6 Send your changes to the intercom system. This  
completes any required programming for ADAM,  
ADAM CS, or Zeus intercom system.  
Another way to generate a call signal is by  
assigning the GPI output as a level 2 talk key  
assignment for any key that is assigned to talk to  
the SSA-424. However, this will cause the call  
lights to flash on the 2-wire line during the entire  
conversation.  
SSA-424 USER MANUAL 15  
 
Table 4. Mode DIP Switch Settings  
4
4.1  
Appendix  
INTERNAL ACCESS  
Switch Settings  
Description  
1
2
3
4
1 Remove six screws from the back cover.  
Configuration 1, Half/Full Duplex Mode  
(default):  
Automatically switches between modes.  
Useful in situations where there is high  
ambient noise. Also useful when there is  
acoustic feedback.  
Off  
Off  
Off  
Off  
2 Remove the top cover.  
This provides access to all internal adjustments.  
Configuration 2, Switched Full Duplex Mode:  
Switches from half duplex to full duplex 3-9  
seconds after conversation begins on the 4-  
wire line. Stays in full duplex mode until 60-  
90 seconds after conversation ceases. This  
helps to keep the line quiet during perdiods of  
no conversation, while permitting natural  
conversation when people are talking. This is  
the preferred operating mode for many  
situations, and particularly for fast, close-  
coordination, team operations.  
3 For option card installation, slide the circuit board  
out toward the back to remove it from the bottom  
cover.  
On  
Off  
Off  
Off  
Telex Communications, Inc., Made in U.S.A.  
AUX  
J4B  
J3B  
AUX  
J4A  
J5 POWER  
+5V 3A  
+15V 1.6A  
-15V 0.3A  
+5V  
+15V  
RTN  
-15V  
Configuration 3, Locked Full Duplex Mode:  
Same as configuration 2, but once a hybrid  
enters full-duplex mode, it stays in that mode  
until power-down.  
J1B  
J1A  
2 WIRE SYSTEM  
J3A  
RTN  
J2A  
J2B  
4 WIRE SYSTEM  
4 WIRE SYSTEM  
On  
Off  
Off  
Off  
Off  
On  
On  
Off  
Figure 9. Location of screws for disassembly.  
Configuration4, Half/Full Duplex Mode:  
Similar to configuration 1, but with higher  
sensitivity.  
Half-duplex Definition: Only one side of the line  
can talk at a time and the other side must wait until  
the first side is done talking before responding.  
RV201  
RV202  
Full-duplex Definition: Both sides of the line can  
talk simultaneously.  
S301  
S302  
4.3  
LEVEL DISPLAY CALIBRATION  
This is a factory preset adjustment and  
RV102  
RV101  
should not require readjustment.  
1 On the front panel, set the 4W LEVEL REF SEL  
controls to -10dB.  
2 Set the 2W CHAN SEL switches to 1.  
3 Input a 1kHz, -10dBu test signal at J1A (System  
A) or J1B (System B). (Pin 1, signal common;  
pin 2, signal high.)  
Figure 10. Locations of internal controls.  
4.2  
MODE DIP SWITCH SETTINGS  
4 Adjust RV101 (System A) or RV201 (System B)  
while watching the top display (TO4W). All of the  
green displays should be lit and no amber  
displays should be lit.  
S301 controls the operating mode for System B and  
S302 controls the operating mode for System A.  
Settings are summarized in Table 4  
5 Remove the test signal.  
16 SSA-424 USER MANUAL  
 
6 Set the 2W CHAN SEL switches to either OFF  
position.  
4.4  
CALL SIGNAL OPTION CARD INSTALLATION  
Use these instructions to install a Call Signal Option  
Card in an SSA-424 that was originally ordered  
without it.  
7 Input a 1kHz, -10dBu test signal at the 4-wire  
audio input. Use either connector:  
9-Pin Connector  
Pin 7:Balanced Audio - input  
Pin 8:Balanced Audio + input  
1 Disassemble the SSA-424 as previously de-  
scribed.  
2 Assemble the standoffs to the circuit board using  
the supplied screws and lockwashers.  
RJ11 Connector  
Pin 2:Balanced Audio + input  
Pin 3:Balanced Audio - input  
3 Connect the supplied power cable from J8 on the  
option card to J303 on the main board of the  
SSA-424.  
8 Adjust RV102 (System A) or RV202 (System B)  
while watching the bottom display (TO2W). All of  
the green displays should be lit and no amber  
displays should be lit.  
4 Insert the connectors on the option card into the  
connectors on the main board.  
9 Remove the test signal. This completes the  
adjustment.  
5 Use the remaining screws and lockwashers to  
secure the standoffs to the main board.  
6 Reassemble the SSA-424.  
Figure 11. The Call Signal Option Card after installation in the  
SSA-424.  
SSA-424 USER MANUAL 17  
 
 

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