NPT_ERROR_BASE_SERIAL_PORT 44 extra_lib/include/platinum/NptSerialPort.h const int NPT_ERROR_NO_SUCH_SERIAL_PORT = NPT_ERROR_BASE_SERIAL_PORT - 0; NPT_ERROR_BASE_SERIAL_PORT 45 extra_lib/include/platinum/NptSerialPort.h const int NPT_ERROR_SERIAL_PORT_NOT_OPEN = NPT_ERROR_BASE_SERIAL_PORT - 1; NPT_ERROR_BASE_SERIAL_PORT 46 extra_lib/include/platinum/NptSerialPort.h const int NPT_ERROR_SERIAL_PORT_ALREADY_OPEN = NPT_ERROR_BASE_SERIAL_PORT - 2; NPT_ERROR_BASE_SERIAL_PORT 47 extra_lib/include/platinum/NptSerialPort.h const int NPT_ERROR_SERIAL_PORT_BUSY = NPT_ERROR_BASE_SERIAL_PORT - 3;