英文：A low-speed input device that converts graphic and pictorial data into binary, numeric inputs for a digital computer.
中文：一种低速输入设备，它将图形和图象数据转换成用于数字计算机的二进制数值输入。
英文：For analog inputs, any absolute voltage value above which the analog-to- digital converter cannot distinguish a change. The overload value can be different for plus and minus inputs.
英文：An electrical gate or mechanical device which implements the logical OR operator. An output signal occurs whenever there are one or more inputs on a multichannel input. An OR gate performs the function of the logical "inclusive OR operation" .
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