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Page Title:
Logic Signal Inputs, Differential Type (LD/R) |
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|  MIL-N-85005A(AS)
Power Sources - Logic and signal power sources shall
3.5.11.6.1
be as follows:
SIGNAL SOURCE
LOGIC POWER SOURCE
ANNUNCIATOR
SDC
NC (LD/R)
ALN (Align)
SDC
NC (LD/R)
NAV (Navigate)
SDC
NC (LD/R)
SLV (Slave)
N/A
Battery Unit (SW)
ATTD (Attitude)
IMS PS (SEL)
LMS PS
IMS FAIL
IMS GA (SEL)
CMPTR
NC (LD/R)
SDC
SEL = Single Ended Logic SW = Switch
LD/R = Line Driver/Receiver.
Logic Signal Inputs, Differential Type (LD/R) - All
3.5.11.6.2
differential logic input circuitry shall be similar to a differential
line receiver type A9615 and shall be compatible with the signal supplied
by a differential line driver similar to A9614. Input impedance shall
be nominal 130 ohms dc, balanced line load. Logic levels shall be as
defined in Figure 4.
Logic Signals, Single Ended (SEL) - Single ended
3.5.11.6.3
logic signals shall be unbalanced steady state signals as follows:
2.4 to 5.5 VDC
Logical one "1" =
0 to 0.4 VDC
Logical zero "0" =
Logic Requirements - Logic circuits shall be incorpor-
3.5.11.6.4
ated to control specific annunciators as follows:
The IMS FAIL annunciator shall illuminate when
either of the single ended logic (SEL) discretes, PS or GA, go to Zero
during the ALIGN, NAV, SLAVE and ATTD modes. The IMS FAIL annunciator
shall illuminate whenever logic power is lost during the ALIGN, NAV,
SLV, and ATTD modes. The ATTD annunciator shall illuminate upon a
switch closure signal input. This signal shall be inoperative during
the OFF, CMPTR, and ATTD modes.
The ALN, NAV, SLV, and CMPTR annunciators shall
illuminate whenever the logic signal input is "1" and shall be inopera-
tive whenever the logic power is lost.
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