f. Control Logic and Microprocessor Function (figure FO-23 of
appendix B).
The control logic function interfaces microprocessor U9
with the various controls and circuits in the LD/R. The microprocessor
outputs timing and control signals required for firing the laser,
activating the receiver, and monitoring the AZ, EL, and RNG data. When
you turn power on, the turn-on-reset (TOR) generator creates the TOR
signal.
The TOR signal sets up the LD/R to operate by resetting the
microprocessor and the parallel/serial interface U14 in the control logic
card A1A2, and the energy sense circuitry in the energy control card
A2A1A6.
The microprocessor communicates with the LD/R through a data bus and a
set of I/O expanders. The LD/R operates by either LD/R local controls or
by FIST remote controls.
Multiplexers interface these two sets of
signals and the microprocessor. With FIST connected to the G/VLLD, the
LD/R mode switch A1W2S2, the three code switches A1W2S5, A1W2S6, and
A1W2S7, and the RETICLE BRIGHT potentiometer A1W2R1 become disabled. The
corresponding FIST controls operate the G/VLLD.
When the LD/R is in the AZ ADJ mode, or fires in the range mode, the AZ
and EL data show in the LD/R eyepiece display. The resolver-to-digital
converter (RDC) A1A3 monitors the AZ and EL data from the traversing
unit. The AZ and EL resolvers in the TU send analog signals to the RDC.
The RDC converts these signals to digital signals. These digital signals
go to the microprocessor. The microprocessor combines this data with the
range data and outputs the total data to the display assembly A2A1A3 in
the transceiver assembly A2. The display assembly causes the information
to be displayed in the LD/R eyepiece display.
The RDC provides the reference signal to the resolvers in the TU. This
reference signal allows the AZ and EL position signals to be generated.
Each resolver produces three analog position signals:
SIN, COS, and
COMMON.
The TU sends the six analog signals to the RDC.
The RDC
converts the signals to digital data for use in the LD/R.
The
microprocessor provides a timing signal RDC CLOCK (50 kHz) to the RDC to
control the timing of the data flow. The microprocessor also supplies
the DMD and FIST with the AZ, EL, and RNG data. It transmits the signal
COMPUTER WORD to the parallel/serial interface U14. The parallel/serial
interface conditions and outputs COMPUTER WORD to the DMD and FIST.
26
OD1721
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