User Manual

XBee® Wi-Fi RF Modules

their serial port. Network clients will receive the I/O data packet as described in the

XBee IP Services chapter.

IR can be used with sleep. A module will transmit periodic I/O samples at the IR rate

until the ST timer expires, the SleepRq line is asserted, and the device can resume

sleeping. Even if the IR rate is set longer than the ST defined wake time, at least one I/O

sample will still be sent before the module returns to sleep because it sends one

immediately upon wake up. If it is not desired that a sample is sent every wake cycle,

the IF command can be used to configure how many wake cycles should elapse before

sending I/O samples at the IR rate.

Change Detection Sampling

Modules can be configured to transmit a data sample immediately whenever a

monitored digital I/O pin changes state. The IC command is a bitmask that can be used

to set which digital I/O lines should be monitored for a state change. If one or more bits

in IC is set, an I/O sample will be transmitted as soon as a state change is observed in

one of the monitored digital IO lines. Change detection samples are transmitted to the

IPv4 address specified by DL.

I/O Examples

Example 1: Configure the following I/O settings on the XBee

Configure DIO1/AD1 as a digital input with pull-up resistor enabled

Configure DIO2/AD2 as an analog input

Configure DIO4 as a digital output, driving high.

To configure DIO1/AD1 as an input, issue the ATD1 command with a parameter of 3

("ATD13"). To enable pull-up resistors on the same pin, the PR command should be

issued with bit 3 set (e.g. ATPR8, ATPR1FFF, etc.). The ATD2 command should be issued

with a parameter of 2 to enable the analog input ("ATD22"). Finally, DIO4 can be set as

an output, driving high by issuing the ATD4 command with a parameter value of 5

("ATD45").

After issuing these commands, changes must be applied before the module I/O pins will

be updated to the new states. The AC or CN commands can be issued to apply changes

(e.g. ATAC).

General Purpose Flash Memory

The XBee Wi-Fi RF modules provide 160 4096-byte blocks of flash memory which can be

read and written by the user application. This memory provides a non-volatile data

storage area which can be used for a multitude of purposes. Some common uses of this

data storage include: storing logged sensor data, buffering firmware upgrade data for a

host microcontroller, or storing and retrieving data tables needed for calculations

performed by a host microcontroller. The General Purpose Memory (GPM) is also used

to store a firmware upgrade file for over-the-air firmware upgrades of the XBee module

itself.