Managing End Devices XBee End Device configuration
XBee/XBee-PRO ZigBee RF Modules User Guide 92
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 100 ms while it is awake.
Figure 2: Demonstration of pin sleep
Parent and remote devices must be configured to buffer data correctly and to use adequate transmission
timeouts. See XBee ZB Router/Coordinator configuration on page 98 for details.
To Next Page
Loading...
Need help?
General
