Digi-Frame A4 Multi-Purpose Dokumentacja Pobierz pdf (Strona 71)

XBee®/XBee‐PRO®SERFModules

©2009DigiInternational,Inc. 71

In the figure above, t1, t2, and t3 represent the following events:

•T1 - Time when Sleep_RQ is asserted (high)

• T2 - Time when the XBee enters sleep (CTS state change only if hardware flow control is

enabled)

• T3 - Time when Sleep_RQ is de-asserted (low) and the module wakes.

The time between T1 and T2 varies depending on the state of the module. In the worst case

scenario, if the end device is trying to join a network, or if it is waiting for an acknowledgment

from a data transmission, the delay could be up to a few seconds.

When the XBee is awake and is joined to a network, it sends a poll request to its parent to see if

the parent has any buffered data for it. The end device will continue to send poll requests every

100ms while it is awake.

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Digi-Frame A4 Multi-Purpose Dokumentacja Strona 71