Data Sheet

Connection (Serial)

The RFID Read/Write Module Serial version easily interfaces to any host microcontroller using only four

connections (VCC, SIN, SOUT, GND).

Pin Name

Type

Function

VCC

System power. 5V DC input.

2 SIN I

Serial input from host. 5V TTL-level interface, 9600 bps, 8 data

bits, no parity, 1 stop bit, non-inverted.

3 SOUT O

Serial output to host. 5V TTL-level interface, 9600 bps, 8 data

bits, no parity, 1 stop bit, non-inverted.

4 GND G

System ground. Connect to power supply’s ground (GND)

terminal.

Note: Type: I = Input, O = Output, P = Power, G = Ground

Connection (USB)

The Parallax RFID Read/Write Module USB version can be connected directly to any PC, Macintosh, or

Linux computer that has a USB port and the appropriate drivers installed. The module is powered from

the host’s USB port and uses an FTDI FT232R to provide USB connectivity. FTDI drivers are available

from www.parallax.com and www.ftdichip.com/Drivers/VCP.htm

Signal

Interface

Function

RX Serial Receive

Serial output from host. 9600 bps, 8 data bits, no parity,

1 stop bit.

TX Serial Transmit

Serial input to host. 9600 bps, 8 data bits, no parity, 1

stop bit.

When the Parallax RFID Read/Write Module is connected to the host computer, it will appear as a Virtual

COM port and will have a COM port automatically assigned to it. This COM port can be accessed by any

software application, programming language, or interface that provides COM port connectivity and will

allow you to read the data stream transmitted by the module.