ModBus.cs
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using System;
using System.Collections.Generic;
using System.Text;
using System.IO.Ports;
using System.Reflection;
using log4net;
using System.Threading;
namespace MachineDll
{
class Modbus
{
private SerialPort _serialPort;
public static readonly ILog LOGGER = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
#region Constructor / Deconstructor
public Modbus()
{
}
public Modbus(SerialPort _serialPort)
{
this._serialPort = _serialPort;
}
#endregion
#region Open / Close Procedures
//public bool Open(string portName, int baudRate, int databits, Parity parity, StopBits stopBits)
//{
// //Ensure port isn't already opened:
// if (!sp.IsOpen)
// {
// //Assign desired settings to the serial port:
// sp.PortName = portName;
// sp.BaudRate = baudRate;
// sp.DataBits = databits;
// sp.Parity = parity;
// sp.StopBits = stopBits;
// //These timeouts are default and cannot be editted through the class at this point:
// sp.ReadTimeout = 1000;
// sp.WriteTimeout = 1000;
// try
// {
// sp.Open();
// }
// catch (Exception err)
// {
// modbusStatus = "Error opening " + portName + ": " + err.Message;
// return false;
// }
// modbusStatus = portName + " opened successfully";
// return true;
// }
// else
// {
// modbusStatus = portName + " already opened";
// return false;
// }
//}
//public bool Close()
//{
// //Ensure port is opened before attempting to close:
// if (sp.IsOpen)
// {
// try
// {
// sp.Close();
// }
// catch (Exception err)
// {
// modbusStatus = "Error closing " + sp.PortName + ": " + err.Message;
// return false;
// }
// modbusStatus = sp.PortName + " closed successfully";
// return true;
// }
// else
// {
// modbusStatus = sp.PortName + " is not open";
// return false;
// }
//}
#endregion
#region CRC Computation
private void GetCRC(byte[] message, ref byte[] CRC)
{
//Function expects a modbus message of any length as well as a 2 byte CRC array in which to
//return the CRC values:
ushort CRCFull = 0xFFFF;
byte CRCHigh = 0xFF, CRCLow = 0xFF;
char CRCLSB;
for (int i = 0; i < (message.Length) - 2; i++)
{
CRCFull = (ushort)(CRCFull ^ message[i]);
for (int j = 0; j < 8; j++)
{
CRCLSB = (char)(CRCFull & 0x0001);
CRCFull = (ushort)((CRCFull >> 1) & 0x7FFF);
if (CRCLSB == 1)
CRCFull = (ushort)(CRCFull ^ 0xA001);
}
}
CRC[1] = CRCHigh = (byte)((CRCFull >> 8) & 0xFF);
CRC[0] = CRCLow = (byte)(CRCFull & 0xFF);
}
#endregion
#region Build Message
private void BuildMessage(byte address, byte type, ushort start, ushort registers, ref byte[] message)
{
//Array to receive CRC bytes:
byte[] CRC = new byte[2];
message[0] = address;
message[1] = type;
message[2] = (byte)(start >> 8);
message[3] = (byte)start;
message[4] = (byte)(registers >> 8);
message[5] = (byte)registers;
GetCRC(message, ref CRC);
message[message.Length - 2] = CRC[0];
message[message.Length - 1] = CRC[1];
}
#endregion
#region Check Response
private bool CheckResponse(byte[] response)
{
//Perform a basic CRC check:
byte[] CRC = new byte[2];
GetCRC(response, ref CRC);
if (CRC[0] == response[response.Length - 2] && CRC[1] == response[response.Length - 1])
return true;
else
return false;
}
#endregion
#region Get Response
private byte[] GetResponse()
{
//There is a bug in .Net 2.0 DataReceived Event that prevents people from using this
//event as an interrupt to handle data (it doesn't fire all of the time). Therefore
//we have to use the ReadByte command for a fixed length as it's been shown to be reliable.
//byte[] response = new byte[21];
//for (int i = 0; i < response.Length; i++)
//{
// if (this._serialPort != null && this._serialPort.IsOpen)
// {
// byte readData = (byte)(this._serialPort.ReadByte());
// //byte readData = 0;
// if (readData != null)
// {
// response[i] = readData;
// //LOGGER.Debug("response[" + i + "] = " + readData);
// }
// }
//}
//return response;
Byte[] data = new Byte[_serialPort.BytesToRead];//获取接收缓冲区中数据的字节数
_serialPort.Read(data, 0, _serialPort.BytesToRead);
//LOGGER.Debug("data's length is " + data.Length);
if (data.Length == 0)
{
return null;
}
else
{
//for (int i = 0; i < data.Length;i++ )
//{
// LOGGER.Debug("data ["+i+"] = "+data[i]);
//}
//Array.Copy(response, data, data.Length);
return data;
}
}
#endregion
//#region Function 16 - Write Multiple Registers
//public bool SendFc16(byte address, ushort start, ushort registers, short[] values)
//{
// //Ensure port is open:
// if (this._serialPort.IsOpen)
// {
// //Clear in/out buffers:
// this._serialPort.DiscardOutBuffer();
// this._serialPort.DiscardInBuffer();
// //Message is 1 addr + 1 fcn + 2 start + 2 reg + 1 count + 2 * reg vals + 2 CRC
// byte[] message = new byte[9 + 2 * registers];
// //Function 16 response is fixed at 8 bytes
// byte[] response = new byte[8];
// //Add bytecount to message:
// message[6] = (byte)(registers * 2);
// //Put write values into message prior to sending:
// for (int i = 0; i < registers; i++)
// {
// message[7 + 2 * i] = (byte)(values[i] >> 8);
// message[8 + 2 * i] = (byte)(values[i]);
// }
// //Build outgoing message:
// BuildMessage(address, (byte)16, start, registers, ref message);
// //Send Modbus message to Serial Port:
// try
// {
// this._serialPort.Write(message, 0, message.Length);
// GetResponse(ref response);
// }
// catch (Exception err)
// {
// //modbusStatus = "Error in write event: " + err.Message;
// return false;
// }
// //Evaluate message:
// if (CheckResponse(response))
// {
// //modbusStatus = "Write successful";
// return true;
// }
// else
// {
// //modbusStatus = "CRC error";
// return false;
// }
// }
// else
// {
// //modbusStatus = "Serial port not open";
// return false;
// }
//}
//#endregion
#region Function - Read Registers
public bool SendFuction(byte address, byte funType ,ushort start, ushort registers, ref short[] values)
{
//LOGGER.Debug("modbus into sendFuction ");
//Ensure port is open:
if (this._serialPort.IsOpen)
{
//Clear in/out buffers:
this._serialPort.DiscardOutBuffer();
this._serialPort.DiscardInBuffer();
//Function 3 request is always 8 bytes:
byte[] message = new byte[8];
////Function 3 response buffer:
byte[] response ;//= new byte[5 + 2 * registers];
//Build outgoing modbus message:
BuildMessage(address, funType, start, registers, ref message);
//Send modbus message to Serial Port:
try
{
//LOGGER.Debug("modbus,before write data");
this._serialPort.Write(message, 0, message.Length);
//LOGGER.Debug("modbus,after write data and before get data");
Thread.Sleep(200);
response = GetResponse();
}
catch (Exception err)
{
//modbusStatus = "Error in read event: " + err.Message;
//LOGGER.Warn("modbus ,after write and get data :" + err.StackTrace);
return false;
}
//Evaluate message:
if ((response.Length == (5 + 2 * registers)) && CheckResponse(response))
{
//Return requested register values:返回请求的寄存器
for (int i = 0; i < (response.Length - 5) / 2; i++)
{
values[i] = response[2 * i + 3];
values[i] <<= 8;
values[i] += response[2 * i + 4];
}
//modbusStatus = "Read successful";
return true;
}
else
{
//modbusStatus = "CRC error";
return false;
}
}
else
{
//modbusStatus = "Serial port not open";
return false;
}
}
#endregion
}
}