Clear-Com RM-704 - Manual (Page 28)

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ANNOUNCE OUTPUT (REAR PANEL)
An XLR-3M connector provides the announce output from the station.
Whenever the announce button on the front panel is pressed, the selected
microphone is sent to the announce output and the announce relay is
activated. 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 J11 on the main board to the on
position. Refer to the section on the accessory connector for instructions on
connecting to the relay contacts.
The pinout of the announce output connector is as follows:
Pin 1 --- Ground (shield)
Pin 2 --- - Signal
Pin 3 --- + Signal
IFB/HOT MIC (REAR PANEL, 1/4 INCH
PHONE JACK)
A 1/4 in. (0.64 cm) phone jack marked IFB/Hot mic provides an output signal
from the selected microphone. This output is also intended to work with
Clear-Com’s IFB system. Consult the factory for installation instructions.
The jack connections are as follows:
Tip --- Hot mic output
Ring --- Control signal in
Sleeve --- Ground
ACCESSORY (REAR PANEL, DB-15F)
The accessory DB-15F connector on the rear panel provides auxiliary
program inputs for each channel, remote mic on/off input, line level output,
and announce relay contacts. The pin assignments of the connector are as
follows: