A quick primer example:  Writing about Bits, Bytes, Words, and how to notate effectively.

I am using two very effective Nybble characters  "5" hex (5h), and "A" hex.  5 = five,   A = ten. 

 {Hex character F (1111b) being the character before a carry, is fifteen in "base-10" terminology, which we want to avoid talking "base-10" but  think in terms of Hex Counting instead..} 

okay:

1 hex char = 4 bits.   Ah = 1010b    ( A Nybble/Nibble )

2 hex char = 8-bits )byte / octet(.  5Ah  = 0101 1010b

4 hex char = 16-bits (DWORD / word).  5A5Ah = 0101 1010 0101 1010b   

so... for 2 words written in RFID:

5A5A 5A5Ah = 0101 1010 0101 1010 0101 1010 0101 1010b  ( note: this is a 32-bit variable - like 1/2 of the Reserved Memory bank for example ). 

{ FYI: notation in this message:   ####b == binary data,   ####h == hexidecimal data ;  for ease of reading - every 4 #### is spaced in writing to allow for readability.   -- Try not to do this on Demo apps though - they may get confused, and avoid doing this in Excel / CSV files.

So.... Readable vs Demoable:

E200 3A4D 00FD 0000 1111 2222h  = 'E2003A4D00FD000011112222'  when you see this in 123RFID Mobile for example { minus the single quotes of course...}

I hope this helps.