I assume you are refering to a tachograph driver card according to the ECC regulation No 3821/85, right?
In that case, the communication flow with the card would be something like the following:
SELECT tachograph application
00 A4 04 0C 06 FF544143484F
SELECT elementary file by file identifier (
xxxx
)00 A4 02 0C 02 xxxx
READ BINARY to get file data (
zz
bytes from offsetxxyy
)00 B0 xx yy zz
The card number would typically be in EF Identification (FID 0520
), 16 bytes starting at byte 1.
You can find a complete specification of the driver card's protocol and data structures as part of the regulation document (here).