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Headset Connector
A duel-sided, mono headset may be connected for use along with or in place of the front panel
speaker and a separate microphone. Headphones may be connected for use with a separate micro-
phone.
Headset Microphone Gain Adjustment
The gain of the headset microphone preamp can be adjusted via the recessed trim pot located on the
back panel (see figures, 1, 2, and 3, on pages 10,11, and 12). Turn the pot clockwise to increase gain
and counterclockwise to decrease gain. The limits are ±20 dB from nominal.
Panel Microphone Connector
A panel microphone may be connected for talking with either the front panel speaker or headphones
used for listening. The connector accepts MCP5, MCP6, or MCP90 Panel Microphones. Insert the
microphone and rotate the entire microphone body several turns to lock in place.
Panel Microphone Gain Adjustment
The gain of the panel microphone preamp can be adjusted via the recessed trim pot located on the
back panel. Turn the pot clockwise to increase gain and counterclockwise to decrease gain. The
limits are ±20 dB from nominal.Aux IN
Aux In
Provides a connector for a line-level audio input (program 1).
Microphone Preamplifier
Provides an unswitched, balanced, microphone preamplifier output.
External Headset, Speaker Output, and Footswitch Input
Provides one DB-9 Headset Connection, one DB-9 Speaker Output/Footswitch Connection.
GPIO
Opto-Isolate Input 1-4 ➝ Four general purpose input lines.
Open Collector 1-4 ➝ Four general purpose output lines.
Relay 1 & 2 (A&B)
Includes two SPDT relay outputs.
Coaxial Connection (CS-100 Coaxial System Interface)
Provides the ability to link the unit to the matrix using a single 75 ohm coaxial cable. The interface
converts all audio and data streams to a single transmission path. Perfect for systems where there
are existing, but unused 75 ohm video cable. Requires CSI-200 interface unit at the intercom matrix
end.
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KP-812 Keypanels User Manual
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