{"id":24717,"date":"2025-04-19T10:36:16","date_gmt":"2025-04-19T02:36:16","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/24717.html"},"modified":"2025-04-19T10:36:16","modified_gmt":"2025-04-19T02:36:16","slug":"%e3%80%90qt-%e8%bf%90%e7%94%a8qmodbustcpclient%e7%b1%bb-%e4%b8%8emodbus%e6%9c%8d%e5%8a%a1%e5%99%a8%e9%80%9a%e4%bf%a1%e3%80%91plc%e9%80%9a%e4%bf%a1","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/24717.html","title":{"rendered":"\u3010Qt \u8fd0\u7528QModbusTcpClient\u7c7b \u4e0eModbus\u670d\u52a1\u5668\u901a\u4fe1\u3011plc\u901a\u4fe1"},"content":{"rendered":"<p>QModbusTcpClient \u662f Qt \u6846\u67b6\u4e2d\u7528\u4e8e\u5b9e\u73b0 Modbus TCP \u901a\u4fe1\u7684\u5ba2\u6237\u7aef\u7c7b\u3002\u5b83\u63d0\u4f9b\u4e86\u4e00\u4e2a\u65b9\u4fbf\u7684 API&#xff0c;\u5141\u8bb8\u7528\u6237\u901a\u8fc7 TCP \u534f\u8bae\u4e0e Modbus \u670d\u52a1\u5668\u8fdb\u884c\u901a\u4fe1\u3002\u4ee5\u4e0b\u662f QModbusTcpClient 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punctuation\">(<\/span>QModbusDataUnit<span class=\"token operator\">::<\/span>HoldingRegisters<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span> <span class=\"token operator\">*<\/span>reply <span class=\"token operator\">&#061;<\/span> client<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">sendReadRequest<\/span><span class=\"token punctuation\">(<\/span>readUnit<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>reply<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">isFinished<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span>reply<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>QModbusReply<span class=\"token operator\">::<\/span>finished<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>MyClass<span class=\"token operator\">::<\/span>onReadFinished<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">else<\/span><br \/>\n        <span class=\"token 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