Schematic?

[nmanuel]

Do you have a schematic of your hardware setup?

[sajingeo]

Hardware Connection:
RFID Raspberry Pi(Rev2/1)
VCC ---------> P1
GND ---------> P6
TXD ---------> P8 (GPIO 14)

u can check out the readme for this project.
https://github.com/sajingeo/id12laRFID