MS-702 TWO-CHANNEL MAIN STATION
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JP2 on the main board to the on position. This adjustment should only be
carried out by qualified service personnel.
The pinout of the program input connector is as follows:
Pin 1 --- Ground (shield)
Pin 2 --- + Signal
Pin 3 --- - Signal
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 announce button can also
disconnect the selected headset or panel microphone from the intercom
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:
Note: This adjustment should only be carried out by qualified service
personnel.
Pin 1 --- Ground (shield)
Pin 2 --- - Signal
Pin 3 --- + Signal
The audio output is balanced and transformer isolated. 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-in. (0.64
cm) 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 A 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-in. (0.64 cm) phone
jack. It provides an output signal from the selected headset or panel
microphone. This output is intended to interface 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)
27. Headset Audio Limiter: To protect the hearing of the user, the headset audio
limiter restricts the maximum audio level heard in the headset. The MS-702
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