DATASONICS SIS-1500, System Manual

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SIS-1500 Seafloor Imaging System 4-5
SECTION 4 Theory of Operation Topside Processor Electronics
Workstation
Along with the high resolution monitor, the keyboard, and the pointing device,
the workstation comprises the following integrated components:
Host CPU. A Pentium based processor with serial communications
ports COM1 and COM2 and the parallel port LPT1.
SCSI interface. Connects to the internal hard drive and the optional
high density storage devices.
Serial I/O board. Provides two additional communications ports,
COM3 and COM4.
Graphics engine. Drives the high resolution monitor.
Synchronizer board. Inputs and formats the sonar data.
DSP engine. Processes the sonar data.
Integrated IDE controller. Interfaces with the 3.5" floppy drive.
1.44 Mbyte floppy disk drive. Provides an alternate medium for
system boot-up, the loading of programs, and the making of backup
copies.
The workstation interfaces with the digital multiplexer through its TELEM
serial port and its CLOCK IN and DATA IN connectors. The workstation’s
Pentium based host CPU runs the Chirpscan
3
software and provides the
COM1 and COM2 serial communications ports and the LPT1 parallel port.
The COM1 port, which is the TELEM serial port, outputs the downlink
commands and inputs the uplink vehicle status information and sensor data.
The COM2 port connects to the pointing device on the keyboard, and the
LPT1 port connects to an optional printer. The Synchronizer board inputs the
sonar data and the clock signals from the DATA OUT and CLOCK OUT
connectors, respectively, on the multiplexer. Using the clock signals, the
Synchronizer board extracts the sonar data and formats the data into discrete
packets for output to the DSP engine. The DSP engine is a dual TMS320C40,
60 MHz digital signal processor (DSP), which performs the match-filter
processing of the sonar data. The Graphics engine drives the high resolution
1280 x 1024 color monitor. The SCSI interface services up to seven internal
or external devices, including the installed hard drive and the optional
magneto-optical drive. The Serial I/O board provides the COM3 and COM4
serial communications ports, where COM3 receives the navigation input and
COM4, which is the AUX I/O serial port, is a spare serial port.