UG124 Datasheet, PDF (9/18 Pages) Silicon Laboratories – ZigBee Contact Sensor Reference Design Kit

UG124: ZigBee^® Contact Sensor Reference Design (RD-0030-0201) Kit User's Guide
Operation
5.1.5 ON-NETWORK State
The ON-NETWORK state is a condition where the contact sensor is connected to a ZigBee HA 1.2 network and is not searching for
another network. This state contains multiple entry and exit paths depending on various factors, such as the number of S1 button
presses that are within 0.5 second of each consecutive press.
If power to the contact sensor is removed and later restored, the reference design will not seek other networks unless the user forces it
to leave its joined network (as will be described within this section).
If S1 is pressed once for more than one second, the reference design will enter the LEAVE NETWORK state.
If S1 is pressed two times, the reference design will temporarily enter the IDENTIFY state while remaining on its joined network.
If S1 is pressed three times, the reference design will temporarily enter the NETWORK STATUS state while remaining on its joined
network.
If S1 is pressed four times, the reference design will enter the REJOIN NETWORK state.
If S1 is pressed and held for greater than four seconds, the reference design will activate its tamper monitoring algorithm while remain-
ing on its joined network. Tamper monitoring is used when a reference design is contained inside a housing and the opening of the
housing will release the S1 button. If tamper monitoring is activated and the S1 button is released, it will temporarily enter into the TAM-
PER DETECTED state.
5.1.6 IDENTIFY State
The purpose of this state is to help an installer (or user) identify which device is communicated to by visually flashing the D1 LED in a
specified pattern to locate the targeted device. After a contact sensor leaves the ON-NETWORK state and enters this state, the D1 LED
will flash twice per second if on a network then pause for a full second, repeating the pattern for up to three minutes. This state is tem-
porary, and the contact sensor will return to the ON-NETWORK state once the state’s timer reaches its time limit. While in this state, the
device will report any change in open/close state or any change in tamper alarm state (if tamper monitoring is enabled).
If not on a network, it will enter the ACTIVE NTWK SEARCH state.
If power cycled while in this state, the design will enter the REJOIN NETWORK state.
5.1.7 NETWORK STATUS State
The purpose of this state is to help an installer (or user) to identify if a device is successfully connected to a network. After a contact
sensor leaves the ON-NETWORK state and enters this state, the D1 LED will flash six times if on a network. This state is temporary,
and the contact sensor will return to the ON-NETWORK state once the state’s timer reaches its time limit. While in this state, the device
will report any change in open/close state or any change in tamper alarm state (if tamper monitoring is enabled).
If not on a network, it will enter the ACTIVE NTWK SEARCH state.
If power cycled while in this state, the design will enter the REJOIN NETWORK state.
5.1.8 REJOIN NETWORK State
The purpose of this state is to ensure the design can successfully rejoin a previously joined network with little user intervention, while
minimizing battery drain when searching for the network on both its original connected channel as well as searching on all channels for
the network. Upon locating its original joined network, the design will enter the ON NETWORK state where it will rejoin the network. No
LED flashes will occur during this transition.
For battery savings, if it receives no response from the network, the device will wait 15 minutes before attempting to search for the
network.
If S1 is pressed once for longer than one second, the reference design will enter the LEAVE NETWORK state.
5.1.9 TAMPER DETECTED State
As described in the ON NETWORK state, this state provides a method to act once tampering is detected with this reference design
upon the release of the held S1 button. Entering this state will trigger and launch an alarm message, promptly transmitting this event to
the host gateway on the network. Once tamper monitoring is activated, this alarm can occur in any of the network states. To disable it,
one must fully remove the CR2032 battery and re-install it.
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