XBee®/XBee‐PRO® ZB SMT RF Modules
In the figure above, t1, t2, and t3 represent the following events:
•T1 - Time when the module wakes from cyclic sleep
•T2 - Time when the module returns to sleep
•T3 - Later time when the module wakes from cyclic sleep.
The wake time and sleep time are configurable with software commands as described in the sections below.
Wake Time (Until Sleep)
In cyclic sleep mode (SM=4 or 5), if serial or RF data is received, the module will start a sleep timer (time
until sleep). Any data received serially or over the RF link will restart the timer. The sleep timer value is
settable with the ST command. While the module is awake, it will send poll request transmissions every
100ms to check its parent for buffered data messages. The module returns to sleep when the sleep timer
expires, or if the SI command is sent to it. The following image shows this behavior.
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DCD [ DIGITAL CORE DESIGN ]
