Magtek eDynamo Programmer's Manual page 59

7 - Notification Messages Sent from Device to Host (Extended Notifications Only)
Offset Field Name
Complete
6..7
Data Length
8..n Data
eDynamo| Secure Card Reader Authenticator | Programmer's Manual (COMMANDS)
The total length of data for the entire notification message, summing all Partial
Data Lengths for multiple packets. This field is in big endian format. If this
value is not equal to the Partial Data Length of the current packet, the device is
sending the data using multiple packets.
May contain part or all of the notification data. The size of this field is
contained in the Partial Data Length field.
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