Digi XBEE2 User Manual

Module operation Serial communications
XBee/XBee-PRO ZigBee RF Modules User Guide 25
Serial communications
The XBee RF Modules interface to a host device through a logic-level asynchronous serial port. Through its serial
port, the module can communicate with any logic and voltage compatible UART; or through a level translator to
any serial device; for example: through a RS-232 or USB interface board.
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.
System data flow diagram in a UART-interfaced environment
(Low-asserted signals distinguished with horizontal line over signal name.)
Serial data
Data enters the module UART through the DIN (pin 3) 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.

Digi XBEE2 Specifications

General

Brand	Digi
Model	XBEE2
Category	Control Unit
Language	English