public double ReadRegAscii(byte slaveAddress, long Address, int nTimeout = 1000)
{
Byte[] recvBytes = new Byte[1024];
int recvSize = 0;
byte[] CMD = new byte[17];
CMD[0] = 0;
string temp = (slaveAddress).ToString("X2");
//站号
CMD[1] = (byte)(slaveAddress).ToString("X2").ToCharArray()[0];
CMD[2] = (byte)(slaveAddress).ToString("X2").ToCharArray()[1];
//命令
CMD[3] = (byte)'0';
CMD[4] = (byte)'3';
//地址
byte addr = (byte)((Address & 0XFF00) >> 8);
temp = ((byte)((Address & 0XFF00) >> 4)).ToString("X2");
CMD[5] = (byte)((byte)((Address & 0XFF00) >> 8)).ToString("X2").ToCharArray()[0];
CMD[6] = (byte)((byte)((Address & 0XFF00) >> 8)).ToString("X2").ToCharArray()[1];
temp = ((byte)((Address & 0X00FF) >> 0)).ToString("X2");
CMD[7] = (byte)((byte)((Address & 0X00FF) >> 0)).ToString("X2").ToCharArray()[0];
CMD[8] = (byte)((byte)((Address & 0X00FF) >> 0)).ToString("X2").ToCharArray()[1];
//读出个数
CMD[9] = (byte)'0';
CMD[10] = (byte)'0';
CMD[11] = (byte)'0';
CMD[12] = (byte)'1';
byte[] bytesAscii = new Byte[6];
bytesAscii[0] = slaveAddress;
bytesAscii[1] = 0x03;
bytesAscii[2] = (byte)((Address & 0XFF00) >> 8);
bytesAscii[3] = (byte)(Address & 0X00FF);
bytesAscii[4] = 0x00;
bytesAscii[5] = 0x01;
int VALLRC = ParityType.LRC(bytesAscii, 6);
temp = ((byte)((VALLRC & 0XF0) >> 4)).ToString("X");
CMD[13] = (byte)((byte)((VALLRC & 0XF0) >> 4)).ToString("X").ToCharArray()[0];
CMD[14] = (byte)((byte)(VALLRC & 0X0F)).ToString("X").ToCharArray()[0];
temp = ((byte)((VALLRC & 0X0F) >> 0)).ToString("X");
CMD[15] = 0X0D;
CMD[16] = 0X0A;
CMD[0] = (byte)':';
_serialPort.DiscardInBuffer();
_serialPort.Write(CMD, 0, CMD.Length);
int data = 0;
string result = "";
Stopwatch stopwatch = new Stopwatch();
stopwatch.Restart();
do
{
if (stopwatch.ElapsedMilliseconds > nTimeout)
{
return(double.NaN);
}
try
{
Byte d = (Byte)_serialPort.ReadByte();
recvBytes[recvSize++] = d;
}
catch (Exception ex)
{
continue;
}
if (recvSize >= 5 && recvBytes[3] == (Byte)'8' && recvBytes[3] == (Byte)'3')
{
return(double.NaN);
}
if (recvSize >= 15 && recvBytes[13] == 0x0D && recvBytes[14] == 0x0a)
{
result = Encoding.Default.GetString(recvBytes);
result = result.Substring(7, 4);
data = Convert.ToInt32(result, 16);
return(data);
}
}while (true);
}
