Abstract: The management of user interface and data operation plays a key role in the development of scientific instruments, especially in the control program of an instrument. The complexity responses the same event at different states and atomic state transition should be considered seriously. In this paper, a method is proposed to resolve the management of the state in the control program of the chemistry instrument with State Pattern, which has been successfully extended into our electrochemical instrument, Amphetameter.

Key words: chemistry instrument control, State pattern, design pattern, state