XBP24-DMWIT-250 Digi International, XBP24-DMWIT-250 Datasheet - Page 26

• Manufacturer Part Number: XBP24-DMWIT-250
• Description: XBEE-PRO MESH 2.4 EXTENDED
• Manufacturer: Digi International
• Series: XBEE-PRO™r

Specifications of XBP24-DMWIT-250

• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: ISM
• Applications: General Purpose
• Power - Output: 18dBm
• Sensitivity: -100dBm
• Voltage - Supply: 2.8 V ~ 3.4 V
• Current - Receiving: 55mA
• Current - Transmitting: 250mA
• Data Interface: PCB, Through Hole
• Antenna Connector: On-Board, Wire Whip
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q4542387

XBee/XBee‐PRO DigiMesh 2.4 RF Modules
network will not apply the new settings until the beginning of the next wake time. See the Changing Sleep Parameters
section below for more information.
A sleeping router network is robust enough that an individual node can go several cycles without receiving a sync
message (due to RF interference, for example). As a node misses sync messages the time available for transmitting
messages in the wake time is reduced to maintain synchronization accuracy. By default a module will also reduce its
active sleep time progressively as sync messages are missed.
Synchronization Messages
A sleep coordinator will regularly send sync messages to keep the network in sync. Nodes which have not been syn-
chronized or, in some cases, which have lost sync will also send messages requesting sync information.
Deployment mode is a mode that sleep compatible nodes employ when they are first powered up and the sync mes-
sage has not been relayed. A sleep coordinator in deployment mode will rapidly send sync messages until it receives
a relay of the sync message that it has sent. This allows a network to be deployed more effectively and allows a
sleep coordinator which is accidently or intentionally reset to rapidly re-synchronize with the existing network. If a
node which has exited deployment mode receives a sync message from a sleep coordinator which is in deployment
mode the sync will be rejected and a corrective sync will be sent to the sleep coordinator. Deployment mode can be
disabled using the sleep options command (SO).
A sleep coordinator which is not in deployment mode or which has had deployment mode disabled will send a sync
message at the beginning of the wake cycle. The sleep coordinator will then listen for a neighboring node to relay
the sync. If the relay is not heard then the sleep coordinator will send the sync one additional time.
A node which is not acting as a sleep coordinator which has never been synchronized will send a message requesting
sync information at the beginning of its wake cycle. Synchronized nodes which receive one of these messages will
respond with a synchronization packet. Nodes which are configured as non-sleep coordinators (using the SO com-
mand) which have gone 6 or more cycles without hearing a sync will also send a message requesting sync at the
beginning of their wake period.
The following diagram illustrates the synchronization behavior of sleep compatible modules.
© 2010 Digi International, Inc.
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