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|  MIL-N-85005A(AS)
3.5.8 .4.4.2
Outputs - The radar range signal shall be transferred
on the data channel of para. 3.5.8.4.8.
3.5.8.4.5
Discrete Signal Conditioning - The SDC shall format
discretes for interface with NC. All input discretes shall be converted
to 2 wire differential line driver (Fairchild A9614 or equivalent). All
output discretes shall be received from the NC as 2 wire differential line
receivers (Fairchild A9615 or equivalent) terminated with 130 ohms dc.
3.5.8.4.5.1
Discrete Inputs - The following discrete inputs shall
be received and converted to NC signal level.
Input
Signal Level
Doppler Memory
28 VDC
Doppler Test
28 VDC
Doppler Normal
28 VDC
Search Stores Release
SPDT isolated contacts, 1 amp max
Kill Stores Release
SPDT isolated contacts, 1 amp max
Mark On Top
SPDT isolated contacts, 1 amp max
AHRS No-Go
SPDT isolated contacts, 1 amp max
ITAD No-Go
2-wire differential line driver
Battery Bite GO (IMS)
SPDT isolated contacts
3.5.8.4.5.2
Discrete Outputs - The following discretes shall be
received from the NC and output to external equipments. These discretes
outputs shall be relay contacts that are open or connected to aircraft
ground.
Output
Signal
Level
Distance Shutter
200 ma
DC
1000's Shutter
200 ma
DC
IMS No-Go
200 ma
DC
True Heading Valid
200 ma
DC
3.5.8.4.5.3
Battery Test Command - The SDC shall route the Battery
Test Command from the NC to the IMS Power Supply. When the NC is off, the
Battery Test Command shall be false.
3.5.8.4.6
Omega Interface - The SDC shall interface the computer
subsystem with the AN/ARN-99(V)1 Omega Navigational Set in accordance with
MIL-N-81675(AS). Parallel data from the Omega Receiver Converter shall be
converted to serial data to the NC.
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