Magtek mDynamo Programmer's Manual page 137

Appendix B - EMV Message Formats (EMV Only)
decrypts it, DFDF59 contains a list of TLV data objects defined by terminal setting DFDF17 and
DFDF05. For example:
FC<len>/* container for encrypted generic data */
If the device is configured to prefer MSD data, it includes that data in additional TLV data objects in TLV
data object F2.
mDynamo| OEM Secure Card Reader Authenticator | Programmer's Manual (COMMANDS)
F2<len>/* container for Transaction Data */
... /* Data tags (defined by DFDF17) */
F3<len>/* container for Reversal Data, if any */
... /* Reversal Data tags (defined by DFDF05)*/
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