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Page Title:
Table XXII. CAU/Avionics Digital Interface |
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|  MIL-N-81604C(AS)
Appendix I
TABLE XXII. CAU\AVIONICS DIGITAL INTERFACE (cent)
Word
Resolution
Operational
Zero
Quantity
Length
Range
(LSB Value)
Point
(Bits)
0
Longitude
0.1 arc-
0
18
0 to 180
minute
14
0.1 ft/sec
Ground Speed
0 to 1,638.2
0 ft/sec
(Vg)
ft/sec
Drift Angle
0 to 90
1.319 arc-
0
13
( D)
minutes
Barometric
-1,000 to
20 ft
0 ft
12
+40,940 ft
Altitude
(Hp)
True Air
75 to 450
0.1 kt
13
0 kts.
Speed
kts.
( VTAS )
30.5.8.1 Standard Interfaces - All digital interfaces shall
conform to one of the following definitions by which they must
be designated:
Type 1 - A twisted pair of AWG 22 wires with
a.
one wire used for the signal and the other
wire used for the complement of the signal.
*
True state (l): +4 volts 1.5 volts
(1)
*
False state (0): 0 volts +0.5, -O volts
*
(2)
Noise Immunity: Minimum of 5 volts
common mode and a minimum of 0.3 volts
line-to-line noise immunity.
Interconnecting cables:
60 feet maximum
(3)
(4)
Rise and fall times:
0.15 sec between
1096 and 9096 points.
Receiver impedance:
line-to-line impedance
(5)
of 130 ohms 10% and
100 picofarads shunt
capacitance.
165
.
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