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|  MIL-N-85005A(AS)
3.5.1.7 Lighting Power - The equipment shall utilize aircraft
lighting power in accordance with Paragraph 3.3.12 as follows:
0 - 26 VAC, 0.68 Amp, Maximum
3.5.1.8 Mounting - The Controller shall meet the requirements of
MIL-C-6781 for Type 1 control panels.
3.5.1.9 Color - Surface shall be painted lusterless gray, No.
.
36231, in accordance with FED-STD-595.
3.5.2
Keyer Control (C-9857/ASN-124) - The Keyer control shall
meet the following requirements:
3.5.2.1 Function - The Keyer Control shall interface directly with
the NC. Display data shall be conveyed to the Digital Display Indicator
for visual indication of navigation status. NC data shall be input and
output in both serial and discrete forms. The serial data shall be
synchronous with the NC supplied 1 MHz clock, gated into 16 pulses per
word on dedicated lines.
3.5.2.2 Form Factor - The Keyer Control, exclusive of front panel
protrusions, attachment points, and connector projections, shall be
formed within the following maximum dimensions (inches). Connectors
shall be mounted on the recessed bottom-rear of the unit.
Height
Depth
Width
7.880
5.750
6.500 (behind mounting
surface)
3.5.2.3 Weight - The weight of the Keyer Control shall not exceed
8.5 pounds.
3.5.2.4 Contents - The Keyer Control shall contain logic circuitry
functions interfacing both the NC and the Digital Display Indicator.
3.5.2.4.1 Logic Signal Circuitry - Logic signal circuitry shall
be, or similar to, differential line receivers type A9615 and line
drivers type A9614. Full compatibility shall exist. Circuit input
impedance shall be a nominal 130-ohm dc balanced line load with full
driver capability at this level. Logic level definition shall be as
presented in Figure 4.
3.5.2.4.2 Interface with NC - Refer to data function of Section
3.5.2.1. All communications shall be via a "priority interrupt command
word" method. A command word of 16 bits shall precede all incoming and
outgoing data, and shall contain the instructions specifying what data
are incoming to the Keyer Control or outgoing to the NC in subsequent
series of clock words.
3.5.2.4.2.1 Command Word - The equipment shall be such that several
instructions specified in one command word shall be processed by the
Keyer Control in a specific priority sequence. A reset pulse shall
always precede a command word and shall terminate any processing in
progress, enabling the following new command word.
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