Digital I/O Hardware
Although many researchers and engineers often think of Keithley as a manufacturer of sensitive analog instruments, digital input/output boards make up a substantial part of the company's data acquisition products. Modern measurements often require reading switches and status signals, as well as setting indicators, relays and interlocks. Almost every experiment or test system includes a lot of digital I/O "glue." These on/off controls may not be the most glamorous part of the system, but they must work properly to obtain accurate measurements. This document reviews the use of Keithley's digital I/O line, with special attention to points that novice users may overlook or misunderstand. It is not intended to provide installation procedures for specific hardware or software products. Refer to the appropriate User's Guide for that information.