RTS SSA-424A - Manual (Page 12)

Installation
8
NOTE: TW systems must provide termination on the audio
channel.
There are two possible configurations for unbalanced
connection:
2. On the SSA-424A 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.
NOTE: If System A or System B will not be used, set the
2W CHAN SEL switch to the OFF position and attach a
dummy load to the TW XLR connector.
4-Wire Call Signal Connections
NOTE: These connections require the call signal option.
Call Signal Connection 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 on page 9.
ADAM GPI Connector: XCP-ADAM-MC, J11
ADAM CS GPI Connector: J903
Zeus GPI Connector: J27
If your intercom system is equipped with a UIO-256
(Universal Input/Output) Frame, you can also use that for
connections (Table 2 on page 10 and Table 3 on page 10).
As an alternative to using the GPI, you can use external
components to send and receive call signals as described in
“Call Signal Connections for other 4-wire Communications
Systems” on page 11.
Typical GPI connections are shown in Figure 5 on page 9.
The example uses GPI outputs #1 and #2 and GPI Input #1.
You may substitute other GPI Input and Outputs.
IMPORTANT NOTE FOR AZEDIT USERS: AZedit
version 1.06 or higher includes a feature which allows you to
invert the action of the GPI outputs. By default, these output
are set to duplicate the action of the RTS FR9528 Relay
Frame accessory. This is the correct setting for use with the
SSA-424A. 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 mode is selected.
Balanced Configuration
Pin 1 No Connection
Pin 2 Balanced Audio + Input/Output
Pin 3 Balanced Audio - Input/Output
** Termination 300 Ω
Unbalanced Configuration 1
Pin 1 Audio Common
Pin 2 Audio Input/Output
Pin 3 No Connection
** Termination 200 Ω
Unbalanced Configuration 2
Pin 1 Audio Common
Pin 2 No Connection
Pin 3 Audio Input/Output
** Termination 200 Ω