Hi,

I am using a DT800 connected with Ethernet to a PC. I do use very high sample rate with high channel count in an automated application which generates great amounts of data.

I am speaking of 10+ GB. I am forced to do periodical downloads of data from the DT800 into the controlling PC, but unloading times are extremely high for my needs, even if I split the data unloading.

Is there any way to access the file system in a binary mode and take advantage of the full speed of the Ethernet? Also since I want the measurements to be fully automated, I cannot rely in someone pulling out the memory card and transferring the data to the PC using a card reader.

Any ideas will be most welcome.
Sergi
Universitat de Barcelona

Good morning Sergi,

Have you tried FTP? It will do a binary transfer.

Cheers,
Roger

Thanks Roger,

I have been trying to access the files using the built in FTP in the windows explorer, but I cannot browse into the directory named after the datataker serial number, neither can I copy the folder. I get an error that says 'not such file or directory'.

Is it a problem of the windows explorer? in the end what I want to use is the LabView 8 datasocket in FTP mode, do you think i t wil work?

Yet another question, will the DT800 accept an 8MB compact Flash without problems?

Thanks for the help.

Sergi Udina
Universitat de Barcelona

Good morning Sergi,

Windows IE does have some problems with V4 firmware. This has been fixed in Version 5 used in the DT80.

Have you tried running FTP from the command prompt? FTP works well and your LabView should be able to FTP data from the logger. I think there is an example in the LabView dataTaker drivers.

Version 4 Firmware can address ATAFlash memory cards up to 2 GB in size, so 8 MB should not be a problem.

Cheers,
Roger

I meant 8GB card, and the document your referred had the answer, though it was not the one I would have liked.

I'll be trying this FTP, I browses the Datataker VIs for LabView and haven't seen FTP access in them, though it can be I haven't opened all of them, if you come by a LabView example of FTP please refer me to it, I'll be working on this.

Thanks for your help

Sergi Udina
Universitat de Barcelona

Hello Roger and anyone interested,

FTP data download using LabView8.

I finally managed to perform the data download using ftp and Labview 8 though the process was a little tricky. Since I found no way to do it with the LabView Datasocket, I was forced to access the text ftp using the DOS command line VI provided in LabView.

Then since the command line will not allow to 'write' in the ftp console i wrote a text script for the ftp, so I told the LabView DOS command line VI to cast a ftp -s:scrptifilfe.txt command.

In the script file I did the necessary unit and directory changes and the 'get DATA_A.dxd' that brought me the file, I have observed 240Kb/s data transfer rate so far, which is almost 20 times faster than what I had using the normal Unload commands.

Hope this helps. Thanks Roger for your help and regards from the other side of the world.

Sergi Udina
Universitat de Barcelona