XBee® Wi-Fi RF Modules
© 2013 Digi International, Inc. 26
2. RF Module Operation
Serial Communications
The XBee RF Modules interface to a host device through a logic-level asynchronous
serial port, or a Serial Peripheral Interface (SPI) port. Through its serial ports, the module
can communicate with any logic and voltage compatible UART or SPI; or through a level
translator to any serial device (for example: through a RS-232 or USB interface board).
UART Communications
UART Data Flow
Devices that have a UART interface can connect directly to the pins of the RF module as
shown in the figure below.
UART Serial Data
Data enters the module UART through the DIN pin as an asynchronous serial signal. The
signal should idle high when no data is being transmitted.
Each data byte consists of a start bit (low), 8 data bits (least significant bit first) and a
stop bit (high). The following figure illustrates the serial bit pattern of data passing
through the module.
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