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模拟信息与数字信息具有不同的特点,而电子数字计算机是不能直接处理模拟信息的。因此,在利用电子数字计算机进行数据处理和过程控制时,往往需要把上述两种信息进行相互转换,通常称之为模/数(A/D)转换和数/模(D/A)转换。 D+7A接口板是cromemco公司生产的一块多通道模拟接口板。它具有7路模拟量输入通道、7路模拟量输出通道和一对8位字长的数字量输入、输出通道,并备有A/D和D/A转换所需要的基准电压。D+
Analog and digital information have different characteristics, and electronic digital computer can not directly deal with analog information. Therefore, when using electronic digital computers for data processing and process control, it is often necessary to convert the two kinds of information to one another, commonly referred to as A / D conversion and D / A conversion. The D + 7A interface board is a multi-channel analog interface board made by cromemco. It has seven analog input channels, seven analog output channels and a pair of 8-bit word length digital input and output channels, and with A / D and D / A conversion required by the reference voltage. D +