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#### 5.6.1 Return the serial number

This command should be used to check for the presence of a card. It is special in that it can be used to reset the card. Most other commands will return an error when a card change has been detected and the use of this function is therefore required.

Background: We want to keep the client clear of handling card changes between operations; i.e. the client can assume that all operations are done on the same card unless he call this function.

           SERIALNO

Return the serial number of the card using a status response like:

           S SERIALNO D27600000000000000000000 0

The trailing 0 should be ignored for now, it is reserved for a future extension. The serial number is the hex encoded value identified by the `0x5A` tag in the GDO file (FIX=0x2F02).