{"rsdb":{"rid":"152187","subhead":"","postdate":"0","aid":"114517","fid":"55","uid":"1","topic":"1","content":"
\n

\u603b\u7ed3\u6765\u770b\u4e32\u53e3\u901a\u4fe1\u539f\u7406\uff0c\uff08\u4e5f\u53ef\u4ee5\u8bf4\u5927\u591a\u6570\u901a\u4fe1\u539f\u7406\u4e5f\u662f\u5982\u6b64\uff09\u3002<\/p> \n

\u901a\u4fe1\u9996\u5148\u8981\u6709\u4e2a\u901a\u4fe1\uff0c\u53ef\u4ee5\u7b80\u5355\u7684\u628a\u901a\u4fe1\u770b\u6210\u4e00\u4e2a\u5c0f\u6876\uff0c\u53d1\u9001\u65b9\u4f4f\u6c34\u6876\u91cc\u88c5\u6c34\uff0c\u63a5\u6536\u65b9\u4ece\u6c34\u6876\u4e2d\u53d6\u6c34\u3002\u5982\u679c\u4f60\u8981\u548c\u5bf9\u65b9\u901a\u4fe1\u9996\u5148\u9700\u8981\u5c06\u6876\u76d6\u6253\u5f00\uff0c\u518d\u5c06\u6c34\u88c5\u5165\u5230\u6876\u4e2d\uff0c\u8fd9\u65f6\u63a5\u6536\u65b9\u624d\u80fd\u591f\u4ece\u6876\u4e2d\u53d6\u5230\u6c34\u3002\u8fd9\u91cc\u5c31\u5b58\u5728\u7740\u4e00\u5b9a\u7684\u95ee\u9898\uff0c<\/p> \n

1\uff0c\u5982\u679c\u6876\u76d6\u8fd8\u6ca1\u6709\u6253\u5f00\uff0c\u53d1\u9001\u65b9\u5df2\u7ecf\u53d1\u9001\u4e86\u3002\u8fd9\u65f6\u63a5\u6536\u65b9\u518d\u4ece\u6876\u4e2d\u53d6\u6c34\uff0c\u80af\u5b9a\u53d6\u7684\u6c34\u4e0d\u5bf9\uff0c\u4f1a\u4e0d\u4e00\u90e8\u5206\u7f3a\u5931\u4e86\u3002\u89e3\u51b3\u65b9\u5f0f\u5c31\u662f\u8ba9\u6876\u76d6\u6253\u5f00\u518d\u5f80\u5176\u4e2d\u52a0\u6c34\u3002<\/p> \n

2\uff0c\u4f46\u662f\u6876\u76d6\u4f55\u65f6\u6253\u5f00\uff0c\u53d1\u9001\u65b9\u4f55\u65f6\u53d1\u9001\uff0c\u8fd9\u4e2a\u4e0d\u597d\u628a\u63e1\u3002\u89e3\u51b3\u65b9\u6cd5\uff1a\u63a5\u6536\u65b9\u63a5\u5230\u6570\u636e\u65f6\uff0c\u8981\u8fd4\u56de\u4e00\u4e2a\u5e94\u7b54\u6807\u5fd7\uff0c\u544a\u8bc9\u53d1\u9001\u65b9\u6211\u5df2\u7ecf\u53d6\u5230\u6570\u636e\u4e86\uff0c\u800c\u4e14\u662f\u53d6\u5f97\u5230\u6b63\u786e\u6570\u636e\u624d\u5e94\u7b54\uff0c\u5426\u5219\u4e0d\u7406\u4f1a\uff0c\u7ee7\u7eed\u53d6\u6570\u636e\u3002\u6216\u8005\u4e00\u76f4\u67e5\u8be2\uff0c\u76f4\u5230\u4e0e\u53d1\u9001\u65b9\u53d1\u6765\u7684\u6570\u636e\u4e00\u81f4\u518d\u505c\u6b62\u53d6\u6570\u636e\u3002
\u4e00\u822c\u7684\uff0c\u8fdb\u884c\u4e32\u53e3\u901a\u4fe1\u603b\u6709\u4e00\u4e2a\u662f\u4e3b\u52a8\u65b9\u4e00\u4e2a\u662f\u88ab\u52a8\u65b9\uff0c\u800c\u4e14\u4e8c\u8005\u4f20\u8f93\u6570\u636e\u65f6\uff0c\u4f1a\u6709\u4e00\u5b9a\u7684\u534f\u5546\u597d\u7684\u6570\u636e\u683c\u5f0f\uff0c\u4e8c\u8005\u53d1\u9001\u63a5\u6536\u90fd\u6309\u7167\u6b64\u6570\u636e\u683c\u5f0f\u8fdb\u884c\u3002<\/p> \n

\u5728\u5de5\u4e1a\u63a7\u5236\u4e2d\uff0c\u5de5\u63a7\u673a\uff08\u4e00\u822c\u90fd\u57fa\u4e8eWindows\u5e73\u53f0\uff09\u7ecf\u5e38\u9700\u8981\u4e0e\u667a\u80fd\u4eea\u8868\u901a\u8fc7\u4e32\u53e3\u8fdb\u884c\u901a\u4fe1\u3002\u4e32\u53e3\u901a\u4fe1\u65b9\u4fbf\u6613\u884c\uff0c\u5e94\u7528\u5e7f\u6cdb\u3002
\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u5de5\u63a7\u673a\u548c\u5404\u667a\u80fd\u4eea\u8868\u901a\u8fc7RS485\u603b\u7ebf\u8fdb\u884c\u901a\u4fe1\u3002RS485\u7684\u901a\u4fe1\u65b9\u5f0f\u662f\u534a\u53cc\u5de5\u7684\uff0c\u53ea\u80fd\u7531\u4f5c\u4e3a\u4e3b\u8282\u70b9\u7684\u5de5\u63a7PC\u673a\u4f9d\u6b21\u8f6e\u8be2\u7f51\u7edc\u4e0a\u7684\u5404\u667a\u80fd\u63a7\u5236\u5355\u5143\u5b50\u8282\u70b9\u3002\u6bcf\u6b21\u901a\u4fe1\u90fd\u662f\u7531PC\u673a\u901a\u8fc7\u4e32\u53e3\u5411\u667a\u80fd\u63a7\u5236\u5355\u5143\u53d1\u5e03\u547d\u4ee4\uff0c\u667a\u80fd\u63a7\u5236\u5355\u5143\u5728\u63a5\u6536\u5230\u6b63\u786e\u7684\u547d\u4ee4\u540e\u4f5c\u51fa\u5e94\u7b54\u3002<\/p> \n

\u3000\u3000\u5728Win32\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e24\u79cd\u7f16\u7a0b<\/a>\u65b9\u5f0f\u5b9e\u73b0\u4e32\u53e3\u901a\u4fe1\uff0c\u5176\u4e00\u662f\u4f7f\u7528ActiveX\u63a7\u4ef6\uff0c\u8fd9\u79cd\u65b9\u6cd5\u7a0b\u5e8f\u7b80\u5355\uff0c\u4f46\u6b20\u7075\u6d3b\u3002\u5176\u4e8c\u662f\u8c03\u7528Windows\u7684API\u51fd\u6570\uff0c\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u6e05\u695a\u5730\u638c\u63e1\u4e32\u53e3\u901a\u4fe1\u7684\u673a\u5236\uff0c\u5e76\u4e14\u81ea\u7531\u7075\u6d3b\u3002\u672c\u6587\u6211\u4eec\u53ea\u4ecb\u7ecdAPI\u4e32\u53e3\u901a\u4fe1\u90e8\u5206\u3002<\/p> \n

\u3000\u3000\u4e32\u53e3\u7684\u64cd\u4f5c\u53ef\u4ee5\u6709\u4e24\u79cd\u64cd\u4f5c\u65b9\u5f0f\uff1a\u540c\u6b65\u64cd\u4f5c\u65b9\u5f0f\u548c\u91cd\u53e0\u64cd\u4f5c\u65b9\u5f0f\uff08\u53c8\u79f0\u4e3a\u5f02\u6b65\u64cd\u4f5c\u65b9\u5f0f\uff09\u3002\u540c\u6b65\u64cd\u4f5c\u65f6\uff0cAPI\u51fd\u6570\u4f1a\u963b\u585e\u76f4\u5230\u64cd\u4f5c\u5b8c\u6210\u4ee5\u540e\u624d\u80fd\u8fd4\u56de\uff08\u5728\u591a\u7ebf\u7a0b\u65b9\u5f0f\u4e2d\uff0c\u867d\u7136\u4e0d\u4f1a\u963b\u585e\u4e3b\u7ebf\u7a0b\uff0c\u4f46\u662f\u4ecd\u7136\u4f1a\u963b\u585e\u76d1\u542c\u7ebf\u7a0b\uff09\uff1b\u800c\u91cd\u53e0\u64cd\u4f5c\u65b9\u5f0f\uff0cAPI\u51fd\u6570\u4f1a\u7acb\u5373\u8fd4\u56de\uff0c\u64cd\u4f5c\u5728\u540e\u53f0\u8fdb\u884c\uff0c\u907f\u514d\u7ebf\u7a0b\u7684\u963b\u585e\u3002

\u65e0\u8bba\u90a3\u79cd\u64cd\u4f5c\u65b9\u5f0f\uff0c\u4e00\u822c\u90fd\u901a\u8fc7\u56db\u4e2a\u6b65\u9aa4\u6765\u5b8c\u6210\uff1a<\/p> \n

\uff081\uff09 \u6253\u5f00\u4e32\u53e3
\uff082\uff09 \u914d\u7f6e\u4e32\u53e3
\uff083\uff09 \u8bfb\u5199\u4e32\u53e3
\uff084\uff09 \u5173\u95ed\u4e32\u53e3

1\u3001\u6253\u5f00\u4e32\u53e3<\/strong>

Win32\u7cfb\u7edf<\/a>\u628a\u6587\u4ef6\u7684\u6982\u5ff5\u8fdb\u884c\u4e86\u6269\u5c55\u3002\u65e0\u8bba\u662f\u6587\u4ef6\u3001\u901a\u4fe1\u8bbe\u5907\u3001\u547d\u540d\u7ba1\u9053\u3001\u90ae\u4ef6\u69fd\u3001\u78c1\u76d8\u3001\u8fd8\u662f\u63a7\u5236\u53f0\uff0c\u90fd\u662f\u7528API\u51fd\u6570CreateFile\u6765\u6253\u5f00\u6216\u521b\u5efa\u7684\u3002\u8be5\u51fd\u6570\u7684\u539f\u578b\u4e3a\uff1a<\/p> C++<\/a>\u4ee3\u7801 \n

    \n
  1. HANDLECreateFile(LPCTSTRlpFileName,DWORDdwDesiredAccess,DWORDdwShareMode,LPSECURITY_ATTRIBUTESlpSecurityAttributes,DWORDdwCreationDistribution,DWORDdwFlagsAndAttributes,HANDLEhTemplateFile); \n
    \n \n <\/div>

    lpFileName\uff1a\u5c06\u8981\u6253\u5f00\u7684\u4e32\u53e3\u903b\u8f91\u540d\uff0c\u5982\u201cCOM1\u201d\uff1b
    dwDesiredAccess\uff1a\u6307\u5b9a\u4e32\u53e3\u8bbf\u95ee\u7684\u7c7b\u578b\uff0c\u53ef\u4ee5\u662f\u8bfb\u53d6\u3001\u5199\u5165\u6216\u4e8c\u8005\u5e76\u5217\uff1b
    dwShareMode\uff1a\u6307\u5b9a\u5171\u4eab\u5c5e\u6027\uff0c\u7531\u4e8e\u4e32\u53e3\u4e0d\u80fd\u5171\u4eab\uff0c\u8be5\u53c2\u6570\u5fc5\u987b\u7f6e\u4e3a0\uff1b
    lpSecurityAttributes\uff1a\u5f15\u7528\u5b89\u5168\u6027\u5c5e\u6027\u7ed3\u6784\uff0c\u7f3a\u7701\u503c\u4e3aNULL\uff1b
    dwCreationDistribution\uff1a\u521b\u5efa\u6807\u5fd7\uff0c\u5bf9\u4e32\u53e3\u64cd\u4f5c\u8be5\u53c2\u6570\u5fc5\u987b\u7f6e\u4e3aOPEN_EXISTING\uff1b
    dwFlagsAndAttributes\uff1a\u5c5e\u6027\u63cf\u8ff0\uff0c\u7528\u4e8e\u6307\u5b9a\u8be5\u4e32\u53e3\u662f\u5426\u8fdb\u884c\u5f02\u6b65\u64cd\u4f5c\uff0c\u8be5\u503c\u4e3aFILE_FLAG_OVERLAPPED\uff0c\u8868\u793a\u4f7f\u7528\u5f02\u6b65\u7684I\/O\uff1b\u8be5\u503c\u4e3a0\uff0c\u8868\u793a\u540c\u6b65I\/O\u64cd\u4f5c\uff1b
    hTemplateFile\uff1a\u5bf9\u4e32\u53e3\u800c\u8a00\u8be5\u53c2\u6570\u5fc5\u987b\u7f6e\u4e3aNULL\u3002<\/p>

    \u540c\u6b65I\/O\u65b9\u5f0f\u6253\u5f00\u4e32\u53e3\u7684\u793a\u4f8b\u4ee3\u7801\uff1a<\/p> C++<\/a>\u4ee3\u7801 \n

    \n \n <\/div> \n
      \n
    1. HANDLEhCom;\/\/\u5168\u5c40\u53d8\u91cf\uff0c\u4e32\u53e3\u53e5\u67c4hCom=CreateFile(\"COM1\",\/\/COM1\u53e3<\/li> \n
    2. GENERIC_READ|GENERIC_WRITE,\/\/\u5141\u8bb8\u8bfb\u548c\u51990,\/\/\u72ec\u5360\u65b9\u5f0f<\/li> \n
    3. NULL,OPEN_EXISTING,\/\/\u6253\u5f00\u800c\u4e0d\u662f\u521b\u5efa<\/li> \n
    4. 0,\/\/\u540c\u6b65\u65b9\u5f0fNULL);<\/li> \n
    5. if(hCom==(HANDLE)-1){<\/li> \n
    6. AfxMessageBox(\"\u6253\u5f00COM\u5931\u8d25!\");returnFALSE;<\/li> \n
    7. }returnTRUE; \n
      \n \n <\/div>

      \u91cd\u53e0I\/O\u6253\u5f00\u4e32\u53e3\u7684\u793a\u4f8b\u4ee3\u7801\uff1a<\/p> C++\u4ee3\u7801 \n

      \n \n <\/div> \n
        \n
      1. HANDLEhCom;\/\/\u5168\u5c40\u53d8\u91cf\uff0c\u4e32\u53e3\u53e5\u67c4hCom=CreateFile(\"COM1\",\/\/COM1\u53e3<\/li> \n
      2. GENERIC_READ|GENERIC_WRITE,\/\/\u5141\u8bb8\u8bfb\u548c\u51990,\/\/\u72ec\u5360\u65b9\u5f0f<\/li> \n
      3. NULL,OPEN_EXISTING,\/\/\u6253\u5f00\u800c\u4e0d\u662f\u521b\u5efa<\/li> \n
      4. FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED,\/\/\u91cd\u53e0\u65b9\u5f0fNULL);<\/li> \n
      5. if(hCom==INVALID_HANDLE_VALUE){<\/li> \n
      6. AfxMessageBox(\"\u6253\u5f00COM\u5931\u8d25!\");returnFALSE;<\/li> \n
      7. }returnTRUE;

        2\u3001\u914d\u7f6e\u4e32\u53e3<\/strong><\/p>

        \u5728\u6253\u5f00\u901a\u8baf\u8bbe\u5907\u53e5\u67c4\u540e\uff0c\u5e38\u5e38\u9700\u8981\u5bf9\u4e32\u53e3\u8fdb\u884c\u4e00\u4e9b\u521d\u59cb\u5316\u914d\u7f6e\u5de5\u4f5c\u3002\u8fd9\u9700\u8981\u901a\u8fc7\u4e00\u4e2aDCB\u7ed3\u6784\u6765\u8fdb\u884c\u3002DCB\u7ed3\u6784\u5305\u542b\u4e86\u8bf8\u5982\u6ce2\u7279\u7387\u3001\u6570\u636e\u4f4d\u6570\u3001\u5947\u5076\u6821\u9a8c\u548c\u505c\u6b62\u4f4d\u6570\u7b49\u4fe1\u606f\u3002\u5728\u67e5\u8be2\u6216\u914d\u7f6e\u4e32\u53e3\u7684\u5c5e\u6027\u65f6\uff0c\u90fd\u8981\u7528DCB\u7ed3\u6784\u6765\u4f5c\u4e3a\u7f13\u51b2\u533a\u3002<\/p>

        \u4e00\u822c\u7528CreateFile\u6253\u5f00\u4e32\u53e3\u540e\uff0c\u53ef\u4ee5\u8c03\u7528GetCommState\u51fd\u6570\u6765\u83b7\u53d6\u4e32\u53e3\u7684\u521d\u59cb\u914d\u7f6e\u3002\u8981\u4fee\u6539\u4e32\u53e3\u7684\u914d\u7f6e\uff0c\u5e94\u8be5\u5148\u4fee\u6539DCB\u7ed3\u6784\uff0c\u7136\u540e\u518d\u8c03\u7528SetCommState\u51fd\u6570\u8bbe\u7f6e\u4e32\u53e3\u3002
        DCB\u7ed3\u6784\u5305\u542b\u4e86\u4e32\u53e3\u7684\u5404\u9879\u53c2\u6570\u8bbe\u7f6e\uff0c\u4e0b\u9762\u4ec5\u4ecb\u7ecd\u51e0\u4e2a\u8be5\u7ed3\u6784\u5e38\u7528\u7684\u53d8\u91cf\uff1a

        typedef struct _DCB{ \u2026\u2026\u2026<\/p> \n

        \n

        DWORD BaudRate;\/\/\u6ce2\u7279\u7387\uff0c\u6307\u5b9a\u901a\u4fe1\u8bbe\u5907\u7684\u4f20\u8f93\u901f\u7387\u3002\u8fd9\u4e2a\u6210\u5458\u53ef\u4ee5\u662f\u5b9e\u9645\u6ce2\u7279\u7387\u503c\u6216\u8005\u4e0b\u9762\u7684\u5e38\u91cf\u503c\u4e4b\u4e00\uff1a CBR_110\uff0cCBR_300\uff0cCBR_600\uff0cCBR_1200\uff0cCBR_2400\uff0cCBR_4800\uff0cCBR_9600\uff0cCBR_19200\uff0c CBR_38400\uff0c CBR_56000\uff0c CBR_57600\uff0c CBR_115200\uff0c CBR_128000\uff0c CBR_256000\uff0c CBR_14400<\/p> \n

        DWORD fParity; \/\/ \u6307\u5b9a\u5947\u5076\u6821\u9a8c\u4f7f\u80fd\u3002\u82e5\u6b64\u6210\u5458\u4e3a1\uff0c\u5141\u8bb8\u5947\u5076\u6821\u9a8c\u68c0\u67e5 \u2026<\/p> \n

        BYTE ByteSize; \/\/ \u901a\u4fe1\u5b57\u8282\u4f4d\u6570\uff0c4\u20148<\/p> \n

        BYTE Parity; \/\/\u6307\u5b9a\u5947\u5076\u6821\u9a8c\u65b9\u6cd5\u3002\u6b64\u6210\u5458\u53ef\u4ee5\u6709\u4e0b\u5217\u503c\uff1a EVENPARITY \u5076\u6821\u9a8c NOPARITY \u65e0\u6821\u9a8c MARKPARITY \u6807\u8bb0\u6821\u9a8c ODDPARITY \u5947\u6821\u9a8c<\/p> BYTE StopBits; \/\/\u6307\u5b9a\u505c\u6b62\u4f4d\u7684\u4f4d\u6570\u3002\u6b64\u6210\u5458\u53ef\u4ee5\u6709\u4e0b\u5217\u503c\uff1a ONESTOPBIT 1\u4f4d\u505c\u6b62\u4f4d TWOSTOPBITS 2\u4f4d\u505c\u6b62\u4f4d\n
        ON 5STOPBITS 1.5\u4f4d\u505c\u6b62\u4f4d\n <\/blockquote>

        GetCommState\u51fd\u6570\u53ef\u4ee5\u83b7\u5f97COM\u53e3\u7684\u8bbe\u5907\u63a7\u5236\u5757\uff0c\u4ece\u800c\u83b7\u5f97\u76f8\u5173\u53c2\u6570\uff1a
        BOOL GetCommState(<\/p>

        HANDLE hFile, \/\/\u6807\u8bc6\u901a\u8baf\u7aef\u53e3\u7684\u53e5\u67c4<\/p>

        LPDCB lpDCB \/\/\u6307\u5411\u4e00\u4e2a\u8bbe\u5907\u63a7\u5236\u5757\uff08DCB\u7ed3\u6784\uff09\u7684\u6307\u9488 );<\/p>

        SetCommState\u51fd\u6570\u8bbe\u7f6eCOM\u53e3\u7684\u8bbe\u5907\u63a7\u5236\u5757\uff1a<\/p>

        BOOL SetCommState( HANDLE hFile, LPDCB lpDCB );
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