
ZigBee networks
End device operation
XBee/XBee-PRO® S2C ZigBee® RF Module
71
Command Description
SD
Set the scan duration, or time that the end device will listen for beacons on each
channel.
ZS
Set the stack profile on the device.
EE
Enable or disable security in the network. This must be set to match the
EE
value
(security policy) of the coordinator.
KY
Set the trust center link key. If set to 0 (default), the link key is expected to be obtained
(unencrypted) during joining.
Once the end device joins a network, the network configuration settings persist through power cycles
as mentioned in
. If joining fails, read the status of the last join attempt in the
AI
command register.
If any of these command values change when command register changes are applied, the end device
leaves its current network and attempts to discover and join a new valid network.
When a ZigBee end device has successfully started a network, it:
n
Sets
AI
equal to
0
n
Starts blinking the Associate LED if one has been connected to the device's ASSC pin (TH pin
15/SMT pin 28)
n
Sends an API modem status frame (“associated”) out the serial port when using API mode
n
Attempts to enter low power modes
You can use the following commands to configure these behaviors:
Command
Description
D5
Enables the Associate LED functionality.
LT
Sets the Associate LED blink time when joined. Default is 2 blinks per second (end
devices).
SM
,
SP
,
ST
,
SN
,
SO
Parameters that configure the sleep mode characteristics.
Parent connectivity
The XBee/XBee-PRO ZigBee RF Module end device sends regular poll transmissions to its parent when
it is awake. These poll transmissions query the parent for any new received data packets. The parent
always sends a MAC layer acknowledgment back to the end device. The acknowledgment indicates
whether the parent has data for the end device.
If the end device does not receive an acknowledgment for three consecutive poll requests, it
considers itself disconnected from its parent and attempts to discover and join a valid ZigBee
network. For more information, see
Reset the end device
When the end device is reset or power cycled, if the orphan scan successfully locates a parent, the end
device then checks its PAN ID, operating channel and stack profile against the network configuration
settings (
ID
,
SC
,
ZS
). It also verifies the saved security policy is valid based on the security
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Страница 259: ...AT commands Execution commands XBee XBee PRO S2C ZigBee RF Module 259 Parameter range N A Default N A ...
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Страница 303: ...Load ZigBee firmware on 802 15 4 devices Background 304 Load ZB firmware 305 XBee XBee PRO S2C ZigBee RF Module 303 ...