23 Announce Out: A 3-pin XLR male connector is provided as a feed to a studio PA amplifier.
Pressing the Announce button on the front panel places the audio from the selected headset
or panel microphone on the Annc Out rear panel connector. Optionally, pressing the An-
nounce button can also disconnect the selected headset or panel microphone from the inter-
com line(s). This option is controlled by the Interrupt Announce option switch.
Simultaneously, if the program audio feed to the Announce Output is enabled, it is interrupted
by the announcement. Program audio feed to the Announce Output is selected by setting
jumper JP2 on the Main board to the ON position. The pinout of the Announce Out connector
is as follows:
Pin 1 --- Ground (Shield)
Pin 2 --- - Signal
Pin 3 --- + Signal
The audio output is balanced and transformer isolated. It has a 600 ohm impedance and a
nominal output level of 0 dBV. A shielded twisted pair cable should be used in the cable wired
to this connector.
24 Relay Out: A dry set of relay contacts is provided through a 1/4 inch jack to activate external
switching as needed when the Announce button is pressed. These contacts can be used to
control an external device such as a PA amplifier to another room. The contacts are rated for
2.0 Amps at 24 VDC. The contacts are wired as follows:
Ring --- Normally Closed Contact
Tip --- Common Contact
Sleeve --- Normally Open Contact
25 Hot Mic Out / IFB System: This connection is a 1/4 inch phone jack. It provides a 0 dBV
output signal from the selected headset or panel microphone. This output is intended inter-
face with the External Line In jack on Clear-Com's IFB System. The jack is wired as follows:
Ring --- Ext. IFB Control Signal Input
Tip --- Hot Mic Audio Output
Sleeve --- Ground (Shield)
Clear-Com MS-232 Two-Channel Main Station
8
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General