I'm looking for a way to wirelessly transfer files a short distance without putting the computer 'on a network.' We have industrial computers inside air-purged boxes for operation in a potentially explosive environment. We have found 'intrinsically safe' keyboards to mount outside the box to allow the computer to be controlled, with monitor visible through a window.
The only piece missing now is a way to copy files to and from the system.
I see two possibilities:
1) Some kind of intrinsically safe USB connection on the outside of the box. I haven't found this and don't think it could exist simply because when you're plugging in your flash drive, there is an exposed electrical connection which could cause a spark.
2) Some kind of wireless solution. Ideally we just run a network cable out of the box, but a further restriction is that these computers can not be on a network for security reasons. Is there a bluetooth or irDA flash drive of some sort?
Ideally I'd like to walk up to the box with a flash drive in my pocket, or held up to the window. Have it automatically or manually mount as a drive, then drag files to/from the computer.