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2.4.12
Control Output (J2, Pin A)
Pin A of the top connector is pulled to ground whenever the AUX button is depressed. This serves as a
control line for external devices, such as an entertainment system that the pilot wishes to control.
This could be used in conjunction with a PA to control J2, Pin 18, as well as an external relay to change to
the cabin speaker from the cockpit.
This pin can also be used to control passenger Karaoke Mode, by connecting to pin V of the J2, or as a
copilot hook switch Pin L of J2, or passenger hook switch pin M, J2.
2.4.13 Intercom wiring
The top connector (J2) is for the intercom and additional functions. See Appendix for intercom connection
configurations. It is critical to the proper operation of this system to have this connector wiring made in
accordance with these diagrams. Use 2- and 3-conductor, MIL-spec cable as shown. Connect the shields at
the audio panel end only, and tie to the audio low inputs as shown.
NOTE: The top connector harness can be custom made by Honeywell, Inc. Simply call the factory and
obtain a wire harness work-sheet. The harness will be made to your specifications and fully functionally
tested. All hardware is included.
2.4.13.1 Alternate Intercom Mode (Bottom connector Pin 14)
(Units with serial number beginning with ("J" or above)
If an external switch is installed between pin 14 of the bottom connector and ground, the KMA 28B can
be placed into "Alternate Intercom Mode." In this mode, when the ICS is in "ALL" mode, the passengers
will not hear aircraft radio. In addition, the passengers' microphones are not heard by the crew when the
radios are active.
2.4.14 Entertainment Input
The KMA 28B has two INDEPENDENT music inputs. Entertainment input number 1 is J2 pins 15 (left
channel) and 16 (right channel), WRT pin T, and is provided to the pilot and copilot. Entertainment num-
ber 2 is provided to the passengers at all times.
Entertainment 1 and 2 must be connected together in order for all positions to hear the same music source.
We recommend installing a DPDT switch to allow isolation of the music sources if desired.
16
15
T
14
13
R
NO TE: Use t h e l ow l evel out put of a n y a ddi t i on a l en t er t a i n m en t devi ce t o con n ect t o
t h e a udi o pa n el . Ma xi m um si gn a l l evel i s 2 VAC p-p. DO NO T use a spea ker -l evel
out put , t h i s wi l l ca use i n t er n a l da m a ge i n t h e a udi o pa n el .
D201106000060
Bendix/King
KMA 28B Audio Selector Panel and Intercom System
Installation and Operator's Manual
Alternate Music Interconnect
Page 2-6
Ent. #1 Input
Ent. #2 Input
June 2011
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