smart card reader

[Alias500]

Hi all

I am using a pcb that switches an on board smart card communications between two dummy smart cards.  One is fitted to a device and the other is fitted to a USB smart card reader.

I have written some code that works fine once, but fails after that unless I either pull out the USB lead (works) or the dummy smart card reader (brings up a prompt to try again etc).

I am trying to figure out if it is possible to fix this issue with code rather than extra hardware or mods.

Sudo code:

Inside a Callbackcommand: 

DeleteFile *.* if ==0

then say pass

CopyFile *.* if ==0

then say pass

Switch lines to other dummy card

run code etc

Switch lines to smart card reader

finish

The errors on DeleteFile/CopyFile are either 5 or 6.

The smart card reader does not like the comms severed with out the internal switch being released.

I think I may need to close the mass storage device and reopen it maybe?  Any ideas please?

[Alias500]

maybe  getdrivetype will work?

[Chris_Jones_NIUK]

Hi,

Firstly, welcome to the NI Discussion Forums and apologies for the late reply.

Have you been able to make any progress with this issue? 

I am a little unclear as to exactly what you are doing. Would it be possible for you to clarify the following:

How does the PCB switch communications between the two devices?

Is this a custom PCB? 

You mention that one communication connection is fitted to a device - what device is this?