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opc:/National Instruments.OPCDemo/sine
, sine 是 ItemName,它是由ItemID和AccessPath一起传递的, 但当使用DataSocket连接OPC server时, 没办法给出一个与ItemID不同的AccessPath。当数据返回后通过DataSocket通信时, LabVIEW使用VariantChangeType将数据传成用户要求的原始格式。AddItems的其他输入是可选的, 通常不传递任何数据。
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