Hardware and Software for Microprocessor Controlled HPLC: Interfacing of Converters (A/D and D/A) for Data Acquisition and Display

Abstract

To allow direct acquisition and “real-time” processing of chromatographic data, hardware interfaces and a software operating system are described here for a dual-processor Hplc controller. The interfaces consist of a multiplexed, analog-digital converter, and digital-analog converters with built-in event marker circuits. The analog amplifiers for the converters are specifically designed to permit interfacing of conventional Hplc detectors and recorders to increase the flexibility of the system. A digital logic design is developed that minimizes interface servicing during “real-time” program execution. The software operating system consists of machine-language “kernel” routines for communication between the two processors, and high-level language programs to simplify the oper.