RFID read write doc

Copyright © Parallax Inc. RFID Read/Write Module, Serial (#28440) v1.0 6/29/2010 Page 2 of 10
Connections
The RFID Read/Write Module easily interfaces to any host microcontroller using only four connections
(VCC, SIN, SOUT, GND).
Pin Pin Name Type Function
1 VCC P System power. +5V DC input.
2 SIN I
Serial input from host. TTL-level interface, 9600 bps, 8 data
bits, no parity, 1 stop bit.
3 SOUT O
Serial output to host. TTL-level interface, 9600 bps, 8 data bits,
no parity, 1 stop bit.
4 GROUND G
System ground. Connect to power supply’s ground (GND)
terminal.
Note: Type: I = Input, O = Output, P = Power, G = Ground
Use the following example circuit for connecting the Parallax RFID Read/Write Module: