The Radio Frequency Identification (RFID) Read/Write Module provides a low-cost solution to read and write passive RFID transponder tags up to 3 inches away. The module can be used in a wide variety of hobbyist and commercial applications, including access control, user identification, robotics navigation, inventory tracking, payment systems, car immobilization, and manufacturing automation.

The RFID Read/Write Module works exclusively with the EM Microelectronic-Marin SA EM4x50 1kbit R/W transponder tags. A variety of different tag types and styles exist from such manufacturers as HID Global and CYNTAG. The most popular compatible tags are also available from Parallax. Each tag contains a unique, read-only serial number (one of 2³², or 4,294,967,296 possible combinations) and 116 bytes of user data area stored in a non-volatile EEPROM (Electrically Erasable Read Only Memory). The user data area can be optionally secured with a 32-bit password to allow only authorized read and write operations.

Parallax, Inc. is the exclusive manufacturer and distributor of the RFID Read/Write Module (#28440). For questions and technical support, contact support@parallax.com.

Module Highlights:

• Serial TTL interface, 9600bps
• Requires single +5VDC supply
• 3.25″ L x 2.45″ W
• Bi-color LED for visual indication of activity

Documentation (from Parallax):

• Technical Manual: RFID Read/Write Module
• Sample Code: BASIC Stamp 2