水文地形学の野外観測のためのデータ集録装置の試作

Abstract

A digital data logger for field observation of geomorphological processes was developed.An 8-bit CMOS microprocessor is the pivotal part of the system. An 8-bit A/D converterLSI and an ISO standard digital cassette tape deck work as the input and output of thesystem, respectively. Three snap switches and a push-button switch transmit commands of theoperator to the microprocessor, while a 32-character dot-matrix LCD informs the operator ofthe internal conditions of the system. The microprocessor works under the machine languageprogram written on a CMOS-ROM referring to a CMOS realtime clock LSI and using aCMOS-RAM as a working area. The mode of the data logging are variable according to theprogram. When 8-channel data are to be recorded every one minute, two blocks of CMTdata (each 256 bytes) occur every one hour, and the cassette becomes full in 18 days.During this period the system consumes about 13AH of a 12V battery.The construction of the hardware is orthodox and no special technique was used inthe design and manifacturing, while some devices were needed for the development of thesoftware. A training module of 6800 series microcomputer combined with a ROM writer wasused to assemble the mnemonic program, to fix the assembled program on the EP-ROM andto make de-bug.The use of digital cassette tape prevents the destruction of the recorded data at the timeof the power source down. An ISO standard cassette tape is accessible by many mainframecomputers and personal computers. Different versions of the logging system is possible throughpreparing the EP-ROMs equipped with different programs using the same hardware. Thecontrol function can be easily added be some modification in the software and hardware.