XB24-BPDK Digi International/Maxstream, XB24-BPDK Datasheet - Page 41

• Manufacturer Part Number: XB24-BPDK
• Description: KIT DEVELOPMENT XBEE SERIES 2
• Manufacturer: Digi International/Maxstream
• Series: XBee™r
• Type: 802.15.4/Zigbeer

Specifications of XB24-BPDK

• Frequency: 2.4GHz
• For Use With/related Products: XBee™ Series 2 Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

XBee ZNet 2.5/XBee‐PRO ZNet 2.5 ZigBee OEM RF Modules v1.x4x
Transmitting poll request to parent
(SN = 1)
On/Sleep
S e t tin g S O = 4 w ill c a u s e t h e e n d d e v ic e to s le e p fo r th e e n t ir e S P * S N tim e . T h is
O n /S le e p ( S O = 4 )
T r a n s m ittin g P o ll R e q u e s t to P a r e n t ( S O = 4 )
s h o u ld o n ly b e u s e d if t h e e n d d e v ic e w ill n o t r e c e iv e R F d a t a w h ile s le e p in g .
? t = S P * S N
? t = SP * SN
Setting SN > 1 allows the XBee to silently poll for data without asserting On/Sleep. If RF data is received
? t = S P * S N
? t = SP
Sleep_RQ
Transmitting Poll
Request
Legend
Transmitting Data to End Devices
Figure 4‐016.Polling for Data without Asserting On/Sleep
Figure 4‐017.Transmitting Poll Request to Parent
Since a parent can only buffer data up to 30 seconds, an end device should only sleep for more
than 30 seconds if it will not receive RF data when sleeping. The ST parameter can be set to keep
the end device awake after transmitting data to receive RF data. The commissioning push button
can be used to force the end device to wake for 30 seconds. See section 6.4 for details.
To reliably transmit data to an end device, SP should be set the same on the end device, the end
device’s parent, and on the device that is initiating a transmission to the end device. SP
determines the transmission timeout on the sender, the time to buffer the received packet on the
parent, and the time to sleep on the end device.
© 2008 Digi International, Inc.
when polling, On/Sleep will immediately assert.
On/Sleep
(SN = 3)
Transmitting poll request to parent
? t = SP
? t = SP * SN
40