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sp = new SerialPort ( "COM1" , 9600 , Parity.Even , 8 , StopBits.One );
sp.Open ( );
byte [ ] by = new byte [ 8 ] { 0x01 , 0x03 , 0x00 , 0x00 , 0x00 , 0x04 , 0x44 , 0x09 };
sp.Write ( by , 0 , 8 );
Thread.Sleep ( 1000 );
int iii = sp.BytesToRead;
byte [ ] buffer = new byte [ iii ];
sp.Read ( buffer , 0 , buffer.Length );
sp.Close ( );