XB24-BPDK Digi International/Maxstream, XB24-BPDK Datasheet - Page 39

• 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
Sleep_RQ
(pin 9)
Vcc
0V
Cyclic Sleep
the module will sleep once the current join attempt completes (ie scanning for a valid network to
join). While asleep, the module will not respond to serial or RF activity.
To wake a module operating in pin sleep, de-assert Sleep_RQ (pin 9). The module will wake when
Sleep_RQ is de-asserted and is ready to transmit or receive when the CTS line is low. If the
module has not joined a network, it will scan for a network to join when it wakes.
When a joined end device wakes from pin sleep, it sends a poll request to its parent to see if the
parent has buffered data for the end device. The end device will continue to send poll requests
every 100ms while it remains awake.
Figure 4‐014.Demonstration of Pin Sleep
Cyclic sleep allows modules to wake periodically to check for RF data and sleep when idle. When
the SM parameter is set to 4 or 5, the module operates in cyclic sleep mode. Setting SM to 5
allows the module to be awakened from sleep on a high-to-low transition on Sleep_RQ (pin 9).
Setting SM to 4 disables the pin wake option.
In cyclic sleep mode, if serial or RF data is received, the module will start an inactivity timer and
remain awake until this timer expires. The inactivity time is settable with the ST command. While
the module is awake, it will continue to send poll request transmissions to its parent to check for
buffered data every 100ms. The timer will be restarted anytime serial or RF data is received. The
module will resume sleep when the timer expires. This behavior is shown in the following figure.
Sleep_RQ
Transmitting Poll
Request
Dem onstration of a pin sleep end device that sends poll requests to its parent when awake
Legend
© 2008 Digi International, Inc.
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