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Operation
Serial interface
The XTC RF Module provides a serial interface to an RF link. The XTC RF Module converts serial data to RF
data and sends that data to any over-the-air compatible device in an RF network. The device can
communicate through its serial port with any logic and voltage compatible universal asynchronous
receiver/transmitter (UART), or through a level translator to any serial device.
UART data flow
Devices that have a UART interface can connect directly to the pins of the XTC RF Module as the following
figure shows. The figure shows system data flow in a UART-interfaced environment. Low-asserted signals
have a horizontal line over the signal name.
Serial data
A device sends data to the device's UART through pin 4 (DIN) as an asynchronous serial signal. When the
device is not transmitting data, the signal idles high.
For serial communication to occur, you must configure the UART of both devices with compatible settings
for the baud rate, parity, start bits, stop bits, and data bits. Each data byte consists of a start bit (low), 8
data bits (least significant bit first) and a stop bit (high). The following diagram illustrates the serial bit
pattern of data passing through the device. It shows UART data packet 0x1F (decimal number 31) as
transmitted through the device.
XBee/XBee-PRO XTend Compatible (XTC) RF Module User Guide
When operating at 1 W power output, observe a minimum separation distance of 6 ft (2 m)
between devices. Transmitting in close proximity of other devices can damage the device's
front end.
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