Transfer Data and System Files

The radiometer PC’s hard disk has three directories which are accessible from the host computer:

•	Data Files Directory
•	System Files Directory
•	Root Directory

The data files directory is used to store all backup measurement files with unlimited access for READ and WRITE. The system files and root directories contain files that are essential for the radiometer operation. That is why the access for these directories is READ ONLY. Its files should not be manipulated or deleted by the user. If one tries to write to these directories, the host prompts for a password to be entered. Only the radiometer administrator should know this password for software updating (overwriting 2CH.EXE). Overwriting 2CH.EXE with a non-operating software or deleting this executable file will disable all radiometer functions and requires a system re-initialisation by RPG!   
File transfer is necessary when backup data files need to be copied from the radiometer hard disk to the host computer. If ‘file backup’ is enabled for a measurement, the instrument stores all data files in its Data Files Directory. 
The System Files Directory contains the following files:

•	32RTM.EXE			runtime library
•	32STUB.EXE			stub file loaded by 2CH.EXE to enter protected mode
•	DPMI32VM.OVL		overlay file for DOS protected mode interface
•	2CH.EXE			radiometer software
•	FREQU.DAT			contains frequency list of radiometer
•	RAD.ID			contains radiometer ID (RPG-HATPRO, etc.)
•	SENSOR.SCL		sensor calibration file
•	ABSCAL.CLB		absolute calibration parameters
•	ABSCAL.HIS			absolute calibration history file
•	DELTA_F.ADJ		filter shift file for oxygen line channels

2CH.EXE is the executable that boots up when the radiometer is turned on. The program handles all automatic tasks like detector readout, calibrations, elevation scanning, file storage etc. The only reason for writing to the system file directory is the installation of a 2CH.EXE software update. Write operations to the system files directory are password protected and are reserved for authorized personnel only (contact RPG for password information).
Reading from the system files directory is required when the absolute calibration history file shall be inspected. The file ABSCAL.HIS stores all absolute calibrations (including successful tip curve calibrations). Once copied to any directory on the host hard disk, its contents can be browsed in the Inspect Calibration History menu.
Toggling between data files directory and system files directory display is achieved by pressing the Data Files Directory or System Files Directory radio buttons in the Radiometer group box.
By double clicking on one of the files in the list, the file size in Bytes is displayed. In order to delete the backup files from the data files directory, press Purge Meas. Files. This will delete all backup files from the radiometer. It is not possible to delete single backup files because they are packed together in bigger files to reduce the total number of files on the flash drive. DOMs have problems in handling large numbers of files. During a 3 month continuous operation, up to 20.000 data files are generated by the RPG-HATPRO radiometer which would overload the DOM file system capabilities if they were stored as single files. Packing these files is the only way to handle the problem. Before flushing the backup files they should all be copied to the host first (if the data was not monitored on the host PC with automatic data storage). By pressing Delete Files only single files are removed from the system files directory (password entry required).
When a file needs to be copied from the host to the radiometer, first browse through the host directory tree and mark the file in the file list. Then select Data Files Directory or System Files Directory and press <<. The copy progress is displayed in the Transfer Status group box. Copying in the other direction (from radiometer to host) is done with the >> command.
Multiple files may be selected for deleting and file transfer in both directions. If a file transfer in progress shall be aborted, the user may terminate the operation by pressing <ESC>.