SECTION 1: INSTALLATION 13
EPI800 Manual.doc EPI 800 MANUAL 2001 Vision Microsystems Inc.
1.16 IO INTERFACE BOARD INST.
The IO Interface Board is installed in a location that is free from
moisture, excessive temperature and debris. Since it is a circuit board,
you must decide if it will need a protective enclosure for your
installation. To wire it to the system, connect J1 to the DPU flat display
cable at any connector location. Note that the connectors are keyed to
prevent incorrect insertion and also that the black locking arms snap
over into position.
ANNUNCIATOR LAMP WIRING: All warning lights, audio alert and
fuel level signals are connected to the IO Interface Board. The IO
Interface Board output provides the equivalent of a switch closure to
ground, so for polarized lamps (LED’s for example), the negative leg
of the lamp is connected to the desired IO Interface Board terminal
and the other leg to the positive voltage source (not to exceed 28vdc).
The IO Interface Board can handle up to 0.08 amps (80 milliamps)
per lamp.
AUDIO ALERT WIRING: The IO Interface Board provides a low level
audio signal output for connection to the amplified audio system of the
aircraft. (See your audio panel or radio installation manual for their
recommended connection locations). This audio level is adjustable by
turning the marked potentiometer on the IO Interface Board to
achieve the desired audio level. An optional 'mute' switch can be
connected to the IO BOARD for testing and/or acknowledging an
immediate alert.
ACKNOWLEDGE SWITCH (opt.): A switch of the type ‘momentary
contact, normally open, SPST’ can be installed to ‘acknowledge’ any
new alert and to test the IO Interface Board.
See ‘APPENDIX E: IO Interface Board J2 Wiring’ for all IO Interface
Board connection information. Use standard techniques for wiring to
the D-Style connector. Select the best backshell grommet that
provides a snug fit around the finished wire harness.
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