A24-HASM-450 Digi International/Maxstream, A24-HASM-450 Datasheet - Page 18

• Manufacturer Part Number: A24-HASM-450
• Description: ANT 2.4GHZ DIPOLE HALF-WAVE
• Manufacturer: Digi International/Maxstream
• Series: XPressr

Specifications of A24-HASM-450

• Antenna Type: Whip: 1/2 Wave, Swivel, Tilt (Right Angle)
• Number Of Bands: 1
• Frequency: 2.4GHz
• Vswr: 2
• Gain: 2.1dBi
• Termination: RP-SMA
• Mounting Type: Connector
• Height (max): 4.35" (110.5mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 70000340; Q2724499B

XBee/XBee‐PRO OEM RF Modules ‐ ZigBee ‐ v1.x1x [2007.06.01]
Src Address
Network Layer
3.2.3. Data Transmission and Routing
Dest Address
Broadcast Transmissions
Multicast Transmissions
Unicast Transmissions
Figure 3‐03. ZigBee Data Transmission Higher Layer Addressing Fields
Figure 3‐04. ZigBee Layer‐Addressing Example
All data packets are addressed using both device and application layer addressing fields. Data can
be sent as a broadcast, multicast, or unicast transmission.
Broadcast transmissions within the ZigBee protocol are intended to be propagated throughout the
entire network such that all nodes receive the transmission. To accomplish this, all devices that
receive a broadcast transmission will retransmit the packet 3 times. Each node that transmits the
broadcast will also create an entry in a local broadcast transmission table. This entry is used to
keep track of each received broadcast packet to ensure the packets are not endlessly transmitted.
Each entry persists for 8 seconds. The broadcast transmission table holds 8 entries.
Since broadcast transmissions are retransmitted by each device in the network, broadcast
messages should be used sparingly.
Multicast transmissions operate similar to broadcast transmissions. Data packets are broadcast
throughout the network in a similar fashion. However, only devices that are part of the multicast
group will receive the data packets.
Unicast ZigBee transmissions are always addressed to the 16-bit address of the destination
device. However, only the 64-bit address of a device is permanent; the 16-bit address can change.
Therefore, ZigBee devices may employ network address discovery to identify the current 16-bit
© 2007 Digi International, Inc.
ZigBee Device A
Endpoint 1
Endpoint 2
Endpoint 3
(radio A)
Cluster ID = TurnLightOff
Dest Endpoint
Cluster ID
Application Support Layer
ZigBee Device B
Endpoint 40
Endpoint 41
Endpoint 42
(radio B)
Profile ID
Chapter 3 ‐ ZigBee Networks
Src Endpoint
18