尝试对串口返回值情况进行优化，思路，引入期望返回字节，当不是，进行重发

HSI_HexagonMI_EF3/SevenOcean/CMMIO_SERIAL.CPP

@@ -474,7 +474,10 @@ int CPSerial::ReadBlock(BYTE* abIn, int MaxLength)
 				// m_osRead.Offset=(m_osRead.Offset+dwLength)%MAXBLOCK;
 			}
 			else
+			{
 				dwLength = 0;
+			}
+				
 		}
 	}
 	return dwLength;