Computer control of microprocessor-based instruments by keypad emulation.
A keypad emulation method for controlling microprocessor-based instruments by laboratory microcomputers is presented. It is applicable to instruments that use "polled" keypad arrays; the instrument can be controlled by the laboratory computer or operated independently by manual keypad entry. To illustrate the approach, a microprocessor-based HPLC solvent-delivery system was controlled by a laboratory microcomputer which synchronized and sequenced the entire HPLC experiment, including solvent delivery, valve control for column switching and back-flushing, data-acquisition, and dataprocessing.
Wiegand
P M
PM
Department of Chemistry, Michigan State University, East Lansing, Michigan 48824-1322, U.S.A.
Crouch
S R
SR