XBP09-DMDK Digi International, XBP09-DMDK Datasheet - Page 9

• Manufacturer Part Number: XBP09-DMDK
• Description: KIT STARTER PROMESH XBEE PRO
• Manufacturer: Digi International
• Series: XBEE-PRO™r
• Type: Transceiver, XBeePror

Specifications of XBP09-DMDK

• Frequency: 900MHz
• Wireless Frequency: 900 MHz
• Interface Type: RS-232, USB, UART
• Modulation: FHSS
• Security: 128 bit AES
• Operating Voltage: 3.3 V
• Output Power: 50 mW
• Antenna: RPSMA
• For Use With/related Products: Xbee-PRO Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 602-1130

2. RF Module Operation
Serial Communications
UART Data Flow
Serial Buffers
Microcontroller
Serial Data
The XBee-PRO®OEM 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.
System Data Flow Diagram in a UART‐interfaced environment
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.
The module UART performs tasks, such as timing and parity checking, that are needed for data
communications. Serial communications depend on the two UARTs to be configured with
compatible settings (baud rate, parity, start bits, stop bits, data bits).
The XBee-PRO modules maintain buffers to collect received serial and RF data, which is illustrated
in the figure below. The serial receive buffer collects incoming serial characters and holds them
until they can be processed. The serial transmit buffer collects data that is received via the RF link
that will be transmitted out the UART.
© 2008 Digi International, Inc.
CMOS Logic (3.0-3.6V)
DOUT (data out)
DIN (data in)
CTS
RTS
(Low‐asserted signals distinguished with horizontal line over signal name.)
UART data packet 0x1F (decimal number ʺ31ʺ) as transmitted through the RF module
Example Data Format is 8‐N‐1 (bits ‐ parity ‐ # of stop bits)
Module
XBee
Module
XBee
CMOS Logic (3.0-3.6V)
DOUT (data out)
DIN (data in)
CTS
RTS
Microcontroller
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