> For the complete documentation index, see [llms.txt](https://developer.magtek.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.magtek.com/api-and-command-reference/scra-dynafamily-programmers-manual/about-the-scra-dynafamily-programmers-manual.md).
# 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. **Tag-Length-Value (TLV) Encoding** describes how to encode and decode TLV, and how to read the tables in this document that describe TLV data objects.
## See Also
* [**Tag-Length-Value (TLV) Encoding** ](/api-and-command-reference/scra-dynafamily-programmers-manual/data-types-and-shared-tlv-data-objects.md)
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* 🌐 **Official Site:** [https://www.magtek.com](https://www.magtek.com/)
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**Documentation Feedback:**
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