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|  MIL-D-70789A (AR)
TABLE II.
J1 PIN function. (continued)
PIN
FUNCTION
TERMINATION
(See Fiq .4)
44
Spare
45
DC Return
46
Spare
47
Spare
48
Spare
49
VMS BIT Cmd 2 (RS-422) - Hi
50
VMS BIT Cmd 2 (RS-422) - Lo
51
Spare
52
+ 24 VDC
53
Odometer Reverse (RS-422) - Hi
C
54
Odometer Reverse (RS-422) - Lo
C
55
Spare
56
Spare
57
VMS BIT Cmd 1 (RS-422) - Hi
58
+ 24 VDC
59
+ 24 VDC
60
Spare
61
Spare
62
Spare
63
VMS BIT Cmd 1 (RS-422) - LO
64
Odometer Forward (RS-422) - Hi
C
65
Odometer Forward (RS-422) - LO
C
66
Spare
3.5.4.2 Power.
The DRU shall turn on when activated
(3.5.4.2.1) if the steady state power voltage meets the criteria
specified herein. The DRU shall always turn on when the steady
state power voltage is 18.5 VDC and at any value above 18.5 VDC
up to and including 36.0 VDC. Once on, the DFW shall not cycle
off and on from IR voltage drop and shall operate as specified
herein. The DRU shall always stay on when the steady state power
voltage is 16.3 VDC and at any value above 16.3 VDC up to and
including 36.0 VDC. The DRU shall be off when the steady state
power voltage is 15.0 VDC or less.
The DRU shall operate as specified herein while operating from a
power source functioning at the worst case limits of
MIL-STD-1275, excepting initial engagement surges and cranking.
The DRU shall not be damaged by input voltage polarity reversal.
The DRU shall not be damaged by surges, spikes, ripple, starting
disturbances or steady state voltages (≤ 100 VDC) as specified in
MIL-STD-1275 for normal operation, single fault conditions and
25
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