XBP24-DMUIT-250 Digi International, XBP24-DMUIT-250 Datasheet - Page 27

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

Specifications of XBP24-DMUIT-250

• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: DSSS
• 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: U.FL
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Package / Case: -
• Applications: -
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q4197953C

XBee/XBee‐PRO DigiMesh 2.4 RF Modules
Becoming a Sleep Coordinator
A node can become a sleep coordinator in one of four ways:
Preferred Sleep Coordinator Option
A node can be specified to always act as a sleep coordinator. This is done by setting the preferred sleep coordinator
bit (bit 0) in the sleep options parameter (ATSO) to 1. A node with the preferred sleep coordinator bit set will always
send a sync message at the beginning of a wake cycle. For this reason it is imperative that no more than one node
in the network has this bit set. Although it is not necessary to specify a preferred sleep coordinator, it is oftentimes
advantageous to select a node for this purpose to improve network performance. A node which is centrally located
in the network can serve as a good sleep coordinator to minimize the number of hops a sync message must take to
get across the network. A sleep support node and/or a node which is mains powered may also be a good candidate.
The preferred sleep coordinator bit should be used with caution. The advantages gained by using the option on an
appropriate node become weaknesses to the network when used on a node which is not positioned or configured
appropriately. The preferred sleep coordinator option is also used when setting up a network for the first time.
When starting a network a node should be configured as a sleep coordinator so it will begin emitting sync messages.
After the network is setup the preferred sleep coordinator bit can be disabled.
Nomination and Election
Nomination is an optional process that can occur on a node in the event that contact with the network sleep coordi-
nator is lost. By default this behavior is disabled. This behavior can be enabled with the sleep options command
(SO). This process will automatically occur in the event that contact with the previous sleep coordinator is lost. Any
sleep compatible node which has this behavior enabled is eligible to become the sleep coordinator for the network.
© 2010 Digi International, Inc.
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