About The SCRA DynaFamily Programmer's Manual

These pages detail how to communicate with Secure Card Reader Authenticator (SCRA) devices which implement MagTek Messaging Schema (MMS) and the DynaFlex family, DynaFlex II Go and DynaProx system architecture.

These pages also describe how to communicate with PIN Entry Devices (PED) which implement MagTek Messaging Schema (MMS) and the DynaFlex/DynaProx family system architecture. (PED ONLY)

These pages use bold face to:

• Highlight terms / concepts being formally defined in the current sentence / paragraph

• Highlight important distinguishing keywords in sentences

• Indicate hyperlinks to other sections / tables

These pages use a small number of annotation standards that are important to understand:

• Hexadecimal values are prefixed with 0x unless the context clearly indicates an un-prefixed number is hexadecimal (for example, TLV tags, lengths, and values are always assumed to be hex).

• Binary values are prefixed with 0b unless the context clearly indicates the value is binary.

• Decimal values are not prefixed unless required for clarity, in which case the prefix is 0d.

The standard documented by these pages makes extensive use of Tag-Length-Value encoding. describes how to encode and decode TLV, and how to read the tables in this document that describe TLV data objects.