Xbee/Xbee-Pro Rf Module Operation; Serial Communications For The Xbee/Xbee-Pro Rf Module; Uart Data Flow - Digi XBee Product Manual

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XBee/XBee-PRO RF Module operation

The XBee / XBee-PRO 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 Digi proprietary RS-

232 or USB interface board.

Devices that have a UART interface can connect directly to the pins of the RF module as shown in the

figure below.

Figure 4: 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 DI pin (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.

XBee / XBee-PRO RF Modules 802.15.4 Product Manual

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