diff --git a/doc/RFID READER 13.56MHz Reader_Writer SL500 User Manual Version 2.6 Dec 2009 StrongLink.pdf b/doc/RFID READER 13.56MHz Reader_Writer SL500 User Manual Version 2.6 Dec 2009 StrongLink.pdf
new file mode 100644
index 0000000..c5cb9f7
Binary files /dev/null and b/doc/RFID READER 13.56MHz Reader_Writer SL500 User Manual Version 2.6 Dec 2009 StrongLink.pdf differ
diff --git a/doc/SL500_Communication_Protocol_V35.pdf b/doc/SL500_Communication_Protocol_V35.pdf
new file mode 100644
index 0000000..0c32507
Binary files /dev/null and b/doc/SL500_Communication_Protocol_V35.pdf differ