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|  MIL-D-81347C(AS)
The output signals to provide these functions are:
(1) One Launcher Command
(2) One Left Bank select signal
(3) One alternate Driver select signal
(4) Thirteen Relay select signals
(5) One Even select signal
(6) One Interrogate SLT signal (to be explained in
3.5.2.4.5.4.6.2.2).
(7) Spares 1, 2 and 3
All output lines (except spares 2 and 3) shall have the character-
istics of 3.5.2.4.5.4.6.1. All select commands shall be 260 10% milliseconds in duration except as
noted in Figure 91.
Spare 2 and 3 lines shall be driven by standard data line drivers.
The Launch Command Signal from the OOL shall have the same timing as the spare 2 and 3 lines, but
shall be driven by a standard relay driver. All signals shall be triggered as shown in Figure 91.'
Interrogate - An interrogation mode shall be provided to allow
3.5.2.4.5.4.6.2.2
computer confirmation of pre-flight loading information and check out of the relay selection logic
prior to and after a buoy launch command. The computer shall be able to verify the presence of a
buoy by transmitting a word which is identical to the launch command with the exception of two cate-
gory codes. A Schmitt Trigger in the aircraft ordnance system shall detect the presence or absence
of the 0.1 ohm cartridge load. The equivalent circuit for the interrogate mode is shown in Figure 92.
For SLT interrogation mode, two computer commands are re-
quired. The first command establishes the relay selection matrix with a category code octal 04 to
the OOL. The relay matrix remains in the selected condition until the computer issues an SLT in-
terrogate command category code octal 01 to the AOIL via the OOL. The relay matrix is not reset
until the completion of the AOIL interrogation command, or transmission of an SLT Launch Command.
The two redundant SCR select lines shall not be actuated for the interrogate mode.
Ordnance Select - Sono Depth and Sono Life shall be transmitted
3.5.2.4.5.4.6.2.3
via signals to the Aircraft Ordnance System. Decoding will be done in the aircraft system. These
signals shall be a logical "1" as long as the specified function is to be active. These functions will
be selected prior to launching a sonobuoy. The OOL shall consider these functions to be status type
functions (i. e. , the OOL shall store this information until the computer outputs revised data.)
Door Commands - The OOL shall, upon computer command,
3.5.2.4.5.4.6.2.4
open or close any of the three pressurized sonobuoy launcher doors. The door opening signals shall
be a logical "l" as long as the specified function is to be active. The OOL shall consider these func-
tions to be status type functions and therefore to be stored until the computer outputs revised data.
SUS Launchers
3.5.2.4.5.4.6.3
Selection - The OOL shall upon computer command select and
3.5.2.4.5.4.6.3.1
launch either SUS Deep or SUS Shallow. The output signals shall be a logical "1" for 130 milliseconds
10%
Launch Commands - The OOL shall upon computer command
3.5.2.4.5.4.6.3.2
launch the selected SUS(s). The SUS launch commands (see Figure 87) shall be a 130 10% milli-
seconds pulse.
154
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