Digi International Inc XBEEPRO2 Manual Do Utilizador

Where most AT commands set or query register values, execution commands cause an action to 
be executed on the module.  Execution commands are executed immediately and do not require 
changes to be applied.



SM

Sleep Mode Sets the sleep mode on the RF module. An XBee loaded with router 

firmware can be configured as either a router (SM set to 0) or an end device (SM > 0).  

Changing a device from a router to an end device (or vice versa) forces the device to 

leave the network and attempt to join as the new device type when changes are applied.

RE

0-Sleep disabled (router)
1-Pin sleep enabled
4-Cyclic sleep enabled
5 - Cyclic sleep, pin wake

0 - Router
4 - End 

Device

SN

Number of Sleep Periods. Sets the number of sleep periods to not assert the On/Sleep 

pin on wakeup if no RF data is waiting for the end device. This command allows a host 

application to sleep for an extended time if no RF data is present

CRE

1 - 0xFFFF

1

SP

Sleep Period. This value determines how long the end device will sleep at a time, up to 

28 seconds. (The sleep time can effectively be extended past 28 seconds using the SN 

command.) On the parent, this value determines how long the parent will buffer a 

message for the sleeping end device. It should be set at least equal to the longest SP 

time of any child end device.

CRE

0x20 - 0xAF0 x 10ms 

(Quarter second 

resolution)

0x20

ST

Time Before Sleep Sets the time before sleep timer on an end device.The timer is reset 

each time serial or RF data is received. Once the timer expires, an end device may enter 

low power operation. Applicable for cyclic sleep end devices only. 

E

1 - 0xFFFE (x 1ms)

0x1388 (5 

seconds)

SO 

Command

Sleep Options.  Configure options for sleep.  Unused option bits should be set to 0.  

Sleep options include:
0x02 - Always wake for ST time
0x04 - Sleep entire SN * SP time
0x06 - Enabled extended sleep and wake for ST time
Sleep options should not be used for most applications.  See chapter 6 for more 

information.

E

0  -  0xFF

0

WH

Wake Host. Set/Read the wake host timer value.  If the wake host timer is set to a non-

zero value, this timer specifies a time (in millisecond units) that the device should allow 

after waking from sleep before sending data out the UART or transmitting an IO sample.  

If serial characters are received, the WH timer is stopped immediately.

E

0 - 0xFFFF (x 1ms)

SI

Sleep Immediately. See Execution Commands table below..

PO

Polling Rate. Set/Read the end device poll rate.  Setting this to 0 (default) enables 

polling at 100 ms (default rate).  Adaptive polling may allow the end device to poll more 

rapidly for a short time when receiving RF data.

E

0 - 0x3E8

0x00 (100 

msec)



AC

Apply Changes.  Applies changes to all command registers causing queued command 

register values to be applied.  For example, changing the serial interface rate with the BD 

command will not change the UART interface rate until changes are applied with the AC 

command.  The CN command and 0x08 API command frame also apply changes.

CRE

-

WR

Write. Write parameter values to non-volatile memory so that parameter modifications 

persist through subsequent resets. 
Note: Once WR is issued, no additional characters should be sent to the module until 

after the "OK\r" response is received. The WR command should be used sparingly. The 

EM250 supports a limited number of write cycles.“

CRE

--

--

RE

Restore Defaults.  Restore module parameters to factory defaults.

CRE

--

--

FR

Software Reset. Reset module. Responds immediately with an OK status, and then 

performs a software reset about 2 seconds later.

CRE

--

--

NR

Network Reset. Reset network layer parameters on one or more modules within a PAN. 

Responds immediately with an “OK” then causes a network restart. All network 

configuration and routing information is consequently lost.
If NR = 0: Resets network layer parameters on the node issuing the command. 
If NR = 1: Sends broadcast transmission to reset network layer parameters on all nodes 

in the PAN.

   CRE

0 - 1

--

SI

Sleep Immediately. Cause a cyclic sleep module to sleep immediately rather than wait 

for the ST timer to expire.

E

-

-