599 Menlo Drive, Suite 100 General: info parallax.com Rocklin, California 95765, USA Technical: support parallax.com Office: (916) 624-8333 Web Site: www.parallax.com Fax: (916) 624-8003 Educational: www.stampsinclass.com RFID Reader Module ( 28140) RFID 54 mm x 85 mm Rectangle Tag ( 28141) RFID 50 mm Round Tag ( 28142) 2.45 (62.2mm) 2.15 (54.5mm) 0.14 (3.6mm) 0.1 (2.5mm) Introduction Designed in cooperation with Grand Idea Studio (The Parallax RFID Reader Module works exclusively with the EM Microelectronics-Marin SA EM4100-family of passive read-only transponder tags. A variety of different tag types and styles exist with the most 40 popular made available from Parallax. Each transponder tag contains a unique identifier (one of 2 , or 1,099,511,627,776, possible combinations) that is read by the RFID Reader Module and transmitted to the host via a simple serial interface. Electronic Connections The Parallax RFID Reader Module can be integrated into any design using only four connections (VCC, /ENABLE, SOUT, GND). Use the following circuit for connecting the Parallax RFID Reader Module to the BASIC Stamp microcontroller: Pin Pin Name Type Function 1 VCC P System power, +5V DC input. 2 /ENABLE I Module enable pin. Active LOW digital input. Bring this pin LOW to enable the RFID reader and activate the antenna. 3 SOUT O Serial Out. TTL-level interface, 2400bps, 8 data bits, no parity, 1 stop bit. 4 GND G System ground. Connect to power supplys ground (GND) terminal. Note: Type: I = Input, O = Output, P = Power, G = Ground Parallax, Inc. RFID Reader Module ( 28140) Updated 09/2005 v1.1 Page 2