public double ReadRegRTU2(byte slaveAddress, long Address, int nTimeout = 1000)
{
try
{
Byte[] recvBytes = new Byte[1024];
int recvSize = 0;
byte[] CMD = new byte[8];
CMD[0] = slaveAddress;
CMD[1] = 0X03;
CMD[2] = (byte)((Address & 0X00FF00) >> 8);
CMD[3] = (byte)((Address & 0X00FF) >> 0);
CMD[4] = 0;
CMD[5] = 0X02;
int VALCRC = ParityType.CRC16(CMD, 6);
CMD[6] = (byte)(VALCRC & 0X00FF);
CMD[7] = (byte)((VALCRC & 0XFF00) >> 8);
_serialPort.DiscardInBuffer();
_serialPort.Write(CMD, 0, CMD.Length);
Stopwatch stopwatch = new Stopwatch();
stopwatch.Restart();
int data = 0;
do
{
if (stopwatch.ElapsedMilliseconds > nTimeout)
{
return(double.NaN);
}
try
{
Byte d = (Byte)_serialPort.ReadByte();
recvBytes[recvSize++] = d;
}
catch (Exception ex)
{
continue;
}
if (recvSize >= 2 && recvBytes[1] == 0x02)
{
return(double.NaN);
}
if (recvSize >= 9 && recvBytes[1] == 0x03)
{
data |= recvBytes[3] << 24;
data |= recvBytes[4] << 16;
data |= recvBytes[5] << 8;
data |= recvBytes[6];
return(data);
}
}while (true);
}
catch (Exception e)
{
MessageBox.Show("电抓 串口 读取数据异常 " + e.Message, "Err", MessageBoxButtons.OK, MessageBoxIcon.Error);
return(double.NaN);
}
}
public void WriteRegRTU(byte slaveAddress, long Address, int val)
{
try
{
byte[] CMD = new byte[8];
CMD[0] = slaveAddress;
CMD[1] = 0X06;
CMD[2] = (byte)((Address & 0X00FF00) >> 8);
CMD[3] = (byte)((Address & 0X00FF) >> 0);
CMD[4] = (byte)((val & 0X00FF00) >> 8);
CMD[5] = (byte)((val & 0X00FF) >> 0);
int VALCRC = ParityType.CRC16(CMD, 6);
CMD[6] = (byte)(VALCRC & 0X00FF);
CMD[7] = (byte)((VALCRC & 0XFF00) >> 8);
_serialPort.DiscardInBuffer();
_serialPort.Write(CMD, 0, CMD.Length);
}
catch (Exception e)
{
MessageBox.Show("电抓 串口 写入数据异常 " + e.Message, "Err", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
