RFID
|VCC| -> Arduino +5v
|SIN| -> Arduino pin 6
|SOUT| -> Arduino pin 8
|GND| -> Arduino GND
I also have a 16x2 LCD monitor connected to the Arduino which I intend to use as a display later
1|VSS| -> Arduino GND
2|VDD| -> Arduino +5v
3|VO | -> Arduino GND pin
4|RS | -> Arduino pin 12
5|RW | -> Arduino GND
6|E | -> Arduino pin 10
7|D0 | -> Arduino - Not Connected
8|D1 | -> Arduino - Not Connected
9|D2 | -> Arduino - Not Connected
10|D3 | -> Arduino - Not Connected
11|D4 | -> Arduino pin 5
12|D5 | -> Arduino pin 4
13|D6 | -> Arduino pin 3
14|D7 | -> Arduino pin 2
15|A | -> Not Connected
16|K | -> Not Connected
EM-4100 Card : http://www.parallax.com/Store/Accessories/CommunicationRF/tabid/161/ProductID/115/List/0/Default.aspx?SortField=ProductName,ProductName
According to this, the card is compatible to the RFID, but it can only be read.