java构建的网站如何跟RS485通信？ 在java的web程序中怎么使用串口通讯
\u5173\u4e8e\u4f7f\u7528Java\u5b9e\u73b0rs485\u4e32\u53e3\u901a\u4fe1\u7684\u95ee\u9898comm.jar
\u901a\u8fc7\u4e32\u53e3\uff0cPC\u673a\u53ef\u4ee5\u83b7\u53d6\u8bbe\u5907\u7684\u8f93\u5165\u6570\u636e\uff0c\u4e5f\u53ef\u4ee5\u8ba9PC\u673a\u5411\u8bbe\u5907\u8f93\u51fa\u8f93\u51fa\u3002\u4f60\u7684\u8bbe\u5907\u5e94\u8be5\u6709\u76f8\u5173\u7684\u7a0b\u5e8f\u4e0e\u8bf4\u660e\u3002
\u6700\u8fd1\u5728\u505ajava\u4e32\u53e3\u901a\u8baf\uff0c\u4e3b\u8981\u662f\u7528\u4e2a\u4eba\u7535\u8111\u901a\u8fc7\u4e32\u53e3\u4eceRS485\u8bfb\u53d6\u6570\u636e\uff0c\u5e76\u901a\u8fc7crc\u5faa\u73af\u5197\u4f59\u6821\u9a8c\uff0c\u628a\u63a5\u6536\u6b63\u786e\u7684\u6570\u636e\u89e3\u6790\uff0c\u63d2\u5165\u6570\u636e\u5e93mysql\uff0c\u5e76\u7528SSH\u6280\u672f\u628a\u6570\u636e\u5e93\u6570\u636e\u4ee5\u8868\u683c\u4ee5\u53ca\u56fe\u8868\u5f62\u5f0f\u663e\u793a
\u601d\u8def\uff1a
1.\u4e3a\u4e86\u4eceRS485\u8bfb\u53d6\u6570\u636e\uff0c\u7531\u4e8e\u6682\u65f6\u6ca1\u6709\u786c\u4ef6\u8bbe\u5907\uff0c\u7cfb\u7edf\u662fwin7\uff0c\u6545\u91c7\u7528Virtual Serial Port Drive\uff08VSPD\uff09\u8fd9\u5757\u865a\u62df\u4e32\u53e3\u8f6f\u4ef6\u4ee3\u66ff\u3002\u5e76\u4e0b\u8f7dsscom32.exe\u6a21\u62df\u4e32\u53e3\u901a\u4fe1\u8f6f\u4ef6\u3002
2. \u8981\u60f3\u5b9e\u73b0\u4e32\u53e3\u901a\u4fe1\uff0c\u7528Java\u5b9e\u73b0\u4e32\u53e3\u901a\u4fe1\uff08windows\u7cfb\u7edf\u4e0b\uff09\uff0c\u9700\u8981\u7528\u5230sun\u63d0\u4f9b\u7684\u4e32javacomm20-win32.zip\u3002\u5176\u4e2d\u8981\u7528\u5230\u4e09\u4e2a\u6587\u4ef6\uff0c\u914d\u7f6e\u5982\u4e0b\uff1a
comm.jar\u653e\u7f6e\u5230 JAVA_HOME/jre/lib/ext;
win32com.dll\u653e\u7f6e\u5230 JAVA_HOME/bin;
javax.comm.properties \u4e24\u4e2a\u5730\u65b9\u90fd\u8981\u653e
jre/lib(\u4e5f\u5c31\u662f\u5728JAVA\u6587\u4ef6\u5939\u4e0b\u7684jre),JAVA_HOME/jre/lib\u4e0b
\u8fd9\u4e2a\u914d\u7f6e\u5728\u6211\u7535\u8111\u4e0a\u6d4b\u8bd5\u6210\u529f\uff0c\u4e5f\u8bb8\u4e0d\u9700\u8981\u8fd9\u6837\u9ebb\u70e6\u3002\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u4f60\u4f7f\u7528myeclipse\uff0c\u56e0\u4e3a\u5b83\u81ea\u5e26jre\uff0c\u4f60\u9700\u8981\u5728\u5b83\u6240\u5728\u7684jre\u76f8\u5e94\u4f4d\u7f6e\u653edll\u4ee5\u53caproperties\u6587\u4ef6\u3002
\u662f\u4e0d\u662f\u611f\u89c9\u8fd9\u4e2a\u5f88\u9ebb\u70e6\uff0c\u8fd8\u6709windows\u7684\u9650\u5236\u3002\u540e\u6765\u6211\u4eec\u4e0b\u8f7drxtx\u8fd9\u6b3e\u5f00\u6e90\u5305\u4ee3\u66ff\u4e86\u521a\u624d\u7684comm\u3002\u4e0d\u4ec5windows\u4e0b\u53ef\u4ee5\uff0clinux\u4e0b\u4e5f\u53ef\u4ee5\u3002\u4f7f\u7528\u65b9\u6cd5\u5f88\u7b80\u5355\uff0c\u914d\u7f6e\u5982\u4e0b\uff1a
RXTXcomm.jar\u653e\u5230JAVA_HOME/jre/lib/ext
rxtxSerial.dll\u653e\u5230JAVA_HOME/bin
\u5982\u679c\u4f60\u4f7f\u7528myeclipse\u5de5\u5177\uff0c\u4f60\u9700\u8981\u628arxtxSerial.dll\u653e\u5230\u5b83\u81ea\u5e26\u7684jre\u91cc\u3002
3.\u65b0\u5efaeclipse\u5de5\u7a0b\uff0c\u6dfb\u52a0comm.jar\u6216\u8005RXTXcomm.jar\u5305\u3002\u56e0\u4e3ajavacomm20-win32.zip\u5305\u91cc\u6709\u6837\u4f8bSimpleRead.java\uff0c\u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e2a\u4f8b\u5b50\u6d4b\u8bd5\u4e32\u53e3\u662f\u5426\u6b63\u786e
4.\u63a5\u6536\u6570\u636e\u6b63\u786e\u540e\uff0c\u6839\u636e\u4f20\u9001\u63a5\u6536\u53cc\u65b9\u7684\u534f\u8bae\uff0c\u91c7\u7528CRC\u5faa\u73af\u6821\u9a8c\uff0c\u6839\u636e\u4f20\u8f93\u7684\u4e00\u65b9\u7684\u6821\u9a8c\u51fd\u6570\u5224\u5b9a\u662f\u5426\u662f\u6b63\u786e\u4f20\u8f93
5.\u628a\u6b63\u786e\u7ed3\u675f\u7684\u6570\u636e\u89e3\u6790\uff0c\u67e5\u770b\u81ea\u5df1\u6307\u5b9a\u7684\u901a\u8baf\u89c4\u5219\uff0c\u7136\u540e\u89e3\u6790
6.\u63d2\u5165\u6570\u636e\u5e93\uff0cjdbc\u63d2\u5165
7.\u6570\u636e\u7edf\u8ba1\uff0c\u5b9a\u65f6\u7edf\u8ba1\u6bcf\u5c0f\u65f6\uff0c\u6bcf\u5929\uff0c\u6bcf\u6708\uff0c\u6bcf\u5e74\u7684\u5e73\u5747\u503c\uff0c\u91c7\u7528quartz\u670d\u52a1\u6765\u5b9e\u73b0\u3002
8.\u5efa\u7acbweb\u5de5\u7a0b\uff0c\u91c7\u7528hibernate3\uff0cspring3\uff0cdwr\u6280\u672f\u628a\u6570\u636e\u5e93\u6570\u636e\u52a8\u6001\u663e\u793a\uff0c\u56fe\u8868\u91c7\u7528jfreechart\uff0c\u4ee5\u53caAJAX\u7684\u8fd0\u7528
不然你接收多少字节符合你改发下一寻址命令呢?程序代码处理难度较高.
实际下位机返回数据包可在其代码中补一定其它字节来达到等长,从而使接收代码变得简洁.
等长接收数据后可对接收处理清0来等待下次接收.
补充：
假如下位机的返回数据按地址号能确定接收字节长度，下列代码可实现接收不等长数据，仅供参考：
Private Sub MSComm1_OnComm()
On Error Resume Next
Dim BytReceived() As Byte
Dim strBuff As String
Dim strData As String
Dim i As Integer
Dim x As Integer
Select Case MSComm1.CommEvent
Case 2
MSComm1.InputLen = 0
strBuff = MSComm1.Input
BytReceived() = strBuff
For i = 0 To UBound(BytReceived)
If Len(Hex(BytReceived(i))) = 1 Then
strData = strData & "0" & Hex(BytReceived(i))
Else
strData = strData & Hex(BytReceived(i))
End If
Next
Text3 = Text3 + strData
If Left(strData, 2) = "00" And Len(strData) = 8 Then
Text1(0).Text = Left(strData, 8)
Call DataClear
ElseIf Left(strData, 2) = "01" And Len(strData) = 10 Then
Text1(1).Text = Left(strData, 10)
Call DataClear
End If
End Select
End Sub
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