ミニコンピューターシステムのディジタルアナログ変換器出力を用いた分析機器制御ユニットの試作

概要

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A low-cost and easy-to-assemble ON-OFF control unit was devised to interface a DA converter with various analytical equipments up to 8. This unit was designed to control analytical instruments with a mini-computer which has no digital control unit without any modification in the original computer system. Since most of analytical instruments can be controlled at rather slow speed, this unit is versatile in analytical laboratories equipped with minicomputers. The unit consists of an absolute-value amplifier, a 4-bit AD converter, a BCD-to-decimal converter, a polarity detector, and a holding circuit. Any one of the 8 channels of the unit can be independently turned on or off by a pre-determined positive or negative voltage pulse, which is produced by software and output from the 12-bit DA converter of the computer system. The unit is set up on a 14×20 cm print card and working channels are indicated by light emitting diodes. It was successfully utilized to control the drive direction of a stepping motor, the chart drive of a recorder, the gain control switch of an amplifier, etc., for the multielement analysis with a computer-controlled monochromator.
1977-08-05