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* ICPDAS.
* Power Meter Visual C++6.0 Demo Program
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What is it?
-----------
A simple program to read/write ICPDAS PM-21XX power meter.
This program use CModbus source code to implement modbus protocol.

What is CModbus?
----------------
CModbus is a free Windows Modbus Master project.
Free to download its  Visual C++ 6.0 Source Code,Executables and Documentation.

More information at the CModbus project web site http://mbserver.tripod.com/index.htm


Before your first compiler this program!
---------------------------------------
1.Download [modsrc02.zip] file from http://mbserver.tripod.com/index.htm
2.Decompress modsrc02.zip file, then you will see the [utilclasses] folder.
3.Copy the utilclasses folder.
4.Paste to the location that is the same layer with the [Power Meter program] folder.
5.Now you can open [mfcApp.dsw] demo program project, and compiler it.


Modify CModbus CRC Error! (Optional)
-------------------------
When use the read/write register command of CModbus,it probably get a "CRC ERROR".
Because CModbus receive the return data form a modbus slave device just once. 
If modbus master (ex: your programm) can't receive all return datas at a time,
"CRC ERROR" will happen!  
Modify CModbus "CRC Error" is optional ,not nessary.

Do the changes listed below to avoid "CRC ERROR":
1. Open the LocalModbus.h / LocalModbus.cpp file.
1. Add one parameter in function ReadResponseRTU().
   Example:
   BOOL ReadResponseRTU(CByteArray& abyResponse, //Modbus Response with crc
			DWORD& dwRead,     //Real Number of bytes read from serial port
			WORD fullLengthResponse); //Total Number of bytes should read from serial port 

2. In function CLocalModbus::TxRxMessage(), to use ReadResponseRTU like that:
   ReadResponseRTU(m_abyBuffer,dwNumberOfBytesRead,wLengthResponse)
   The "wLengthResponse" is a variance already declared in function TxRxMessage().

3. In function CLocalModbus::ReadResponseRTU(go to the Line 967 at LocalModbus.cpp).
   Use the following codes to add at Line 945:
   ****************************************
   DWORD  dwTimeOut = 0;
   WORD wError;
   dwTimeOut = ::timeGetTime() + m_lTimeOut;
   ****************************************

4. In function CLocalModbus::ReadResponseRTU(go to the Line 967 at LocalModbus.cpp).
   Use the following codes instead of the original codes at Line 968 to 979: 

   ****************************************
   fullLengthResponse = fullLengthResponse + 2; // CRC has 2 bytes

	 do{

	       if( !::ReadFile(m_hComHandle,&abyResponse[dwRead],(iRespMaxSize-INITIAL_READ),&dwNumberOfBytesRead,NULL) ) { //read one charcter 
		      if (::ClearCommError(m_hComHandle,&dwErrors,&cstStatus)){
			     TRACE("ReadFile Errors 0x=%xd",dwErrors);
			  }
		      else{
			     TRACE(" ClearCommError Failed reading");
			  }
		   
		      return (FALSE);
		   }
	   
	       dwRead=dwRead+dwNumberOfBytesRead;

	       //if no data to receive,or baudrate/stopbit changed
	       if( dwTimeOut<::timeGetTime() )
	       {
	     	      wError=(ERR_TIMEOUT);
		      dwRead=0;
                      break; // break do-while
	       }

	   }while(dwRead < fullLengthResponse);

   ****************************************

5. Compiler the program project again!