/// <summary>
/// 读取寄存器数据
/// </summary>
/// <param name="StartAdd">int,寄存器开始地址</param>
/// <param name="PointCount">int,读取个数</param>
/// <param name="mReturnBuff">byte[],读取到的数据,mReturnBuff.Length应该为PointCount*2</param>
/// <returns></returns>
public bool StandarBoardRead(int StartAdd, int PointCount, ref byte[] mReturnBuff)
{
int i;
byte[] WriteBuff = new byte[10]; //发送数据
byte[] ReadBuff = new byte[2 * PointCount + 5]; //接收数据
int ReturnByte = 0; //返回数据
bool IsReturn = false; //是否成功返回
bool IsTimeOut = false; //是否超时
DateTime NowTime; //当前时间
TimeSpan ts; //时间差
byte CrcHi = 0, CrcLo = 0; //CRC校验
if (cMain.isDebug)
{
for (i = 0; i < PointCount; i++)
{
mReturnBuff[i] = (byte)(20 + (byte)(Num.Rand() * 10));
}
return(true);
}
if (!mStandarBoardInit)//没有初始化
{
StandarBoardInit();
return(false);
}
//byte NowByte;
try
{
WriteBuff[0] = _StandarModebusAddress;
WriteBuff[1] = 0x03;
WriteBuff[2] = (byte)((StartAdd & 0xFF00) >> 8);
WriteBuff[3] = (byte)(StartAdd & 0x00FF);
WriteBuff[4] = (byte)((PointCount & 0xFF00) >> 8);
WriteBuff[5] = (byte)(PointCount & 0x00FF);
cMain.CRC_16(WriteBuff, 6, ref CrcLo, ref CrcHi);
WriteBuff[6] = CrcLo;
WriteBuff[7] = CrcHi;
if (!comPort.IsOpen)
{
comPort.Open();
}
comPort.DiscardInBuffer();//刷新串口
comPort.Write(WriteBuff, 0, 8);
NowTime = DateTime.Now;
do
{
//System.Windows.Forms.Application.DoEvents();
Threading.Thread.Sleep(50);
if (comPort.BytesToRead >= (2 * WriteBuff[5] + 5))//收到数据
{
ReturnByte = comPort.BytesToRead;
IsReturn = true;
}
ts = DateTime.Now - NowTime;
if (ts.TotalMilliseconds > timeOut)//时间超时
{
IsTimeOut = true;
}
} while (!IsReturn && !IsTimeOut);
if (!IsReturn && IsTimeOut)//超时
{
if (ErrStr.IndexOf("接收数据已超时") < 0)
{
ErrStr = ErrStr + DateTime.Now.ToString() + ",StandarBoardRead," + ":读取失败,接收数据已超时" + (char)13 + (char)10;
}
return(false);
}
comPort.Read(ReadBuff, 0, ReturnByte);
if ((ReadBuff[0] != WriteBuff[0]) || (ReadBuff[1] != WriteBuff[1]))//数据检验失败
{
if (ErrStr.IndexOf("接收数据错误") < 0)
{
ErrStr = ErrStr + DateTime.Now.ToString() + ",StandarBoardRead," + ":读取失败,接收数据错误" + (char)13 + (char)10;
}
return(false);
}
else
{
for (i = 0; i < PointCount * 2; i++)
{
mReturnBuff[i] = ReadBuff[i + 3];
}
}
}
catch (Exception exc)
{
if (ErrStr.IndexOf(exc.ToString()) < 0)
{
ErrStr = ErrStr + DateTime.Now.ToString() + ",StandarBoardRead," + ":" + exc.ToString() + (char)13 + (char)10;
}
return(false);
}
return(true);
}