5.2 ZigBee Network Behavior

This section describes the various operational states that the smart outlet reference design is able to occupy as it joins and leaves a

ZigBee network. The input mechanism for operation utilizes the external push button. The green LED and red LED operates as output

signaling information as the reference design traverses or occupies a functional state.

Figure 5.1. Device Operation State Diagram

5.2.1 Power-up

After the hardware has been powered for the first time, the device will be in a factory default mode and will be placed in the ACTIVE

NTWK SEARCH state. If the reference design successfully joins a network and is powered off at a later time, upon re-powering, it will

return to the ON NETWORK state.

5.2.2 OFF NETWORK State

This state is a condition where the design is not connected to a network and is not searching for a network. To leave this state and

enter the ACTIVE NTWK SEARCH state, press the button one time.

5.2.3 ACTIVE NTWK SEARCH State

This state is a condition where the reference design is actively searching for a network but has not yet joined a network. While in this

mode, the green LED will flash once every two seconds. This operation of actively searching for a network will remain for up to 20

scans of the band, or approximately 160 seconds. If no network is found, the reference design will enter into the OFF NETWORK state.

Power-cycling or a button press while in this state will reset the timer, while keeping the reference design in this state. If a joinable

network is found it will leave this state and enter the NETWORK JOIN state.

5.2.4 NETWORK JOIN State

After leaving the ACTIVE NTWK SEARCH state and entering this state, the green LED will flash six times in three seconds to indicate

successfully finding and joining a network. This state is temporary and will place the reference design into the ON NETWORK state

once the green LED completes its flash sequence.

Operation

silabs.com | Smart. Connected. Energy-friendly.

Rev. 0.1 | 8