The RD-23's LCD and five-button keypad provides a direct interface to the end user while the RD-23's RS-232 port, utilized with the applicable software, allows for remote PC control and configuration of the RD-23. Utilizing the five-button keypad and observing the LCD, the user is able to scroll through the various measurement functions of the RD-23 and toggle between the different menu screens. The amount of measurement information and the number of menu screens viewable is determined by the model number of the RD-23.
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