XB24-BWIT-004 Digi International/Maxstream, XB24-BWIT-004 Datasheet - Page 36

• Manufacturer Part Number: XB24-BWIT-004
• Description: MODULE 802.15.4 SER 2 WIRE ANT
• Manufacturer: Digi International/Maxstream
• Series: XBee™r

Specifications of XB24-BWIT-004

• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4
• Applications: Home/Building Automation, Industrial Control, ZigBee™
• Power - Output: 2 mW (3 dBm)
• Sensitivity: -96dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 38mA
• Current - Transmitting: 35mA
• Data Interface: PCB, Through Hole
• Antenna Connector: On-Board, Wire Antenna
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -

XBee ZNet 2.5/XBee‐PRO ZNet 2.5 ZigBee OEM RF Modules v1.x4x
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4.3.2. Parent Operation
If the end device is awake with the ST timer running (SM=4), or if Sleep_RQ is de-asserted
(SM=1), the end device will send poll requests every 100ms to ensure it receives any new RF data
from its parent.
Figure 4‐011.RF Data Sent to Sleeping End Device
When an end device joins a ZigBee PAN, it becomes a child of the (coordinator or router) device it
joined to, and the device that allowed the join becomes the end device's parent. Thereafter, the
parent will manage RF data packets for the end device. If the parent receives an RF packet
destined for the end device, it will store the data packet until one of the following occurs:
When the parent stores a packet destined for an end device child, it stores the packet for a
maximum time set by SP. The actual storage time is computed as (SP * 2.5), not exceeding 30
seconds. If end devices implement cyclic sleep, SP should be set the same on a parent as it is on
their sleeping end device children. In the case of pin sleep, where RF data could be received, the
end device should wake within SP time to ensure incoming RF data is not lost. The parent can only
store one broadcast packet (the most recently received) for its end device children.
The parent is also responsible for performing any route or address discoveries to forward data sent
by its end device child(ren) into the mesh network. The parent’s interactions with the mesh
network in behalf of its end device child(ren) are shown in the figure below. (Note address and
route discoveries occur only as needed.)
© 2008 Digi International, Inc.
• The parent runs out of storage space and cannot store a new packet.
• A packet has been stored for a period of time (timeout).
• The destination end device child sends a poll request transmission to request the data packet.
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