Clear-Com RM-702 - Manual (Page 31)

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PA FEED TO STUDIO OUTPUT
Pressing the button marked announce on the front of the RM-702 temporarily
disables activity of the station and places the output of the selected
microphone on the announce audio output terminals of the accessory I/O
DB-15 connector on the rear panel of the station. Isolated relay contacts are
also available for controlling some external devices, such as a PA amplifier to
another room.
To connect to the announce output, connect a shielded twisted-pair cable to
pins #6 and #13 of the accessory connector and use pin #5 for connection of
the shield.
A relay is provided that activates when the announce button is pressed and its
contacts are available on the accessory connector. The relay is rated for 2.0
Amps of DC current at 24 VDC.
Figure 2-16: Connections for Announce Audio and Relay Outputs