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We appreciate your patience as we improve our online experience.
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串口设备不响应命令时,请按如下步骤排除故障.。
许多仪器都需要一个回车或者一个换行来结束命令字符串。LabVIEW中的Serial Port Write.vi只发送字符串输入控件中的那些字符,不会自动加上终止字符。许多终端仿真包(如Windows HyperTerminal)会在传输结束时自动添加一个回车。而在LabVIEW中,如果仪器需要相应的终止字符,您需要在Serial Port Write.vi中的字符串输入中自己添加合适的终止字符。
有些仪器需要回车符(\r);有些则需要换行符(\n)。当您点击了键盘上的换行符之后,LabVIEW会插入一个\n(换行符)。如要插入回车符,可使用Concatenate Strings函数来添加一个回车符常量;或者从字符串快捷菜单中选择'\' Codes Display之后,手动输入\r 。关于'\' Codes Display的更多信息请参见LabVIEW帮助,LabVIEW帮助可以通过Start » Programs » National Instruments » LabVIEW 8.2 » LabVIEW Help打开。
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