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Page Title:
Sono Receiver Logic Output Drive Capability |
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|  MIL-D-81347C(AS)
(4) Ten Forced Manual Mode indicator lines (one for each pair
of processor channels). This line shall be at O V when the Forced Manual Mode is in effect.
Form of Data Transmission - Channel selection data between the
3.5.1.4.7.2.2.3
SRL and the receiver shall be in BCD Format. Data on the control lines shall be at a continuous and
uninterrupted level changing only upon receipt of proper command from the computer or upon input from
manual control. Channel selection data shall be stored in the SRL in the Auto Mode.
3.5.1.4.7.2.2.4
Logic Levels - All logic levels at the Sono Receiver/SRL Interface
shall comply with Figure 36.
Turning Data Indication - It is a systems requirement that the
3.5.1.4.7.2.2.5
sensor station operator be able to monitor the computer select channel when in the Auto mode. This is
accomplished by PRO devices that are part of the sonobuoy receiver group control indicator panels.
These PRO's are connected in parallel with the receiver group input and hence in parallel with the
SRL output. The combination receiver input, and PRO input collectively form an ORing circuit capable
of being driven from the SRL or the maintenance control panel. See Figure 33 for typical interface.
3.5.1.4.7.2.2.6
Sono Receiver Logic Output Drive Capability
(1) Output drivers shall be capable of supplying to external loads
no more than 25 microampere.
(2) Output driver circuits shall be capable of accepting from ex-
ternal sources, a maximum of 5 ma.
3.5.1.4.7.2.2.7
Sono Receiver Logic Input Gate Capability - Input gates shall re-
quire a maximum of 2 ma from external sources.
3.5.1.4.7.2.2.8
Light Off Detector Interface - The SRL Sonobuoy subunit shall
receive an input from the receiver group that is descriptive of RF level information. The input will
consist of three parallel bits. `IWO bits will define RF carrier level, the third bit will indicate when
level information from the receiver is valid, and is designated as an LOD Valid. Upon receipt of an
LOD Valid signal from the AN/ARR-72 receiver, the RF level data shall be transmitted to the computer.
Mode Select Drivers - For each of the ten pairs of data line output
3.5.1.4.7.2.2.9
groups from a subunit to the receiver there shall be one line for establishing Auto/Manual Mode control
for the associated pair of processor channels. This line shall provide a 521.5 volt level to the proces-
sor pair control indicator panel in the Manual mode of operation. It shall provide 0.0 + 0.5- 0.0V
to the processor control indicator panel when the Auto mode of operation is desired.
3.5.1.4.7.2.2.10
Output - When any pair of channels is in the Com-
Manual Mode
puter Selected Manual mode, the circuitry shall be
so arranged that the stored SRL data associated
with that pair is inhibited, thereby allowing each of
the output data lines to be controlled, on a line by
line basis, by the Manual Selectors in the receiver
group.
3.5.1.4.7.3
Test Modes - All testing shall be performed using data and control
signals from the Maintenance Control Panel described in 3.5.1.4.9.
3.5.1.4.7.3.1
I F P M - In-flight performance monitoring capability shall be pro-
vided in the SRL to the extent that any loss of functional capability may be detected and processed by
the computer as a malfunction.
3.5.1.4.7.4
Interface Requirements
3.5.1.4.7.4.1
Output Data Transfer - The SRL shall receive data from the com-
puter via the Digital Output Multiplexer (DOM). Communications between the SRL and the DOM shall
be in accordance with 3.5.1.4.2.
71
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