ST5111 is SATA adapter from M.2 Socket 2. This module allows you connect any SATA device to M.2 slot through a standard SATA port. 
M2S supports M.2 socket 2 with TYPE 2242-D2-B-M of SATA SSD. SATA interface supports standard SATA 7pin data signals. ST5111 is the best solution to evaluate M.2 SATA SSD socket.

Specifications
Standard SATA interface adapter from M.2 Socket 2 slot for SATA SSD
Compliant with PCIe M.2 Specification Rev 0.7
Body Size: TYPE 2242,Type 2260, Type 2280
Module Key : B+M (Both Key B and Key M)
Interface : Standard SATA 7pin Connector
Compliant with Serial ATA Revision 3.1