5. Operation

5.1 ZigBee Network Behavior

This section describes the various operational states a powered contact sensor reference design is able to occupy as it joins and leaves

a ZigBee network. The input mechanism for operation utilizes a join button, S1. The red LED operates as output signaling information

as the reference design traverses or occupies a functional state. Refer to the figure below for a pictorial representation of this process.

OFF NETWORK

No LED Flashes

ON NETWORK

No LED flashes

NETWORK JOIN

Six LED flashes

ACTIVE NTWK SEARCH

One LED flash per

two seconds

LEAVE NETWORK

Three LED flashes per

two seconds

NETWORK STATUS

Six LED flashes

IDENTIFY

Two LED flashes per

two seconds for three minutes

Button press,

or power cycle

No joinable network

found for three minutes

Two button presses

Three button presses

One button

press >1 second

TAMPER DETECTED

Alarm message sent

If button held

>4 seconds

is released

No response from

network, wait

15 minutes

No response from network

-or-

4 button presses

-or-

power cycle

REJOIN NETWORK

No LED flashes

One button

press >1 second

A button press resets

three minute timer

Button held >4

seconds activates

tamper monitoring

Blink cycle ends

Joinable network

found

Mode time out

Mode time out

Figure 5.1. Device Operation State Diagram

5.1.1 First Time Contact Sensor 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 dimmer switch successfully joins a network is powered off at a later time, upon re-powering, it will enter

the REJOIN NETWORK state instead of the ACTIVE NTWK SEARCH state.

5.1.2 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 S1 button one time.

5.1.3 ACTIVE NTWK SEARCH State

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

mode, the D1 LED will flash once every two seconds. This operation of actively searching for a network will remain for up to three mi-

nutes. If no network is found by the three minute time limit, the contact sensor will enter into the OFF NETWORK state. Power-cycling

or a button press while in this state will reset the three minute timer, while keeping the contact sensor in this state. If a network is found

it will leave this state and enter the NETWORK JOIN state.

5.1.4 NETWORK JOIN State

After a contact sensor leaves the ACTIVE NTWK SEARCH state and enters this state, the D1 LED will flash six times to indicate suc-

cessfully finding and joining a network. This state is temporary and will place the contact sensor into the ON NETWORK state once the

LEDs complete their flash sequence. Power cycling will only impair the LED flashes, and will not prevent entry into the ON NETWORK

STATE once the power is reapplied.

Operation

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