A24-HASM-450 Digi International/Maxstream, A24-HASM-450 Datasheet - Page 12

• 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]
2.2. Modes of Operation
2.2.1. Idle Mode
2.2.2. Transmit Mode
When not receiving or transmitting data, the RF module is in Idle Mode. During Idle Mode, the RF
module is also checking for valid RF data. The module shifts into the other modes of operation
under the following conditions:
When serial data is received and is ready for packetization, the RF module will exit Idle Mode and
attempt to transmit the data. The destination address determines which node(s) will receive the
data.
Prior to transmitting the data, the module ensures that a 16-bit Network Address and route to the
destination node have been established.
If the 16-bit Network Address is not known, Network Address Discovery will take place. If a route
is not known, route discovery will take place for the purpose of establishing a route to the
destination node. If a module with a matching Network Address is not discovered, the packet is
discarded. The data will be transmitted once a route is established. If route discovery fails to
establish a route, the packet will be discarded.
Figure 2‐04. Transmit Mode Sequence
When data is transmitted from one node to another, a network-level acknowledgement is
transmitted back across the established route to the source node. This acknowledgement packet
indicates to the source node that the data packet was received by the destination node. If a
network acknowledgement is not received, the source node will re-transmit the data. See Data
Transmission and Routing in chapter 3 for more information.
© 2007 Digi International, Inc.
• Transmit Mode (Serial data in the serial receive buffer is ready to be packetized)
• Receive Mode (Valid RF data is received through the antenna)
• Sleep Mode (End Devices only)
• Command Mode (Command Mode Sequence is issued)
Idle Mode
New
Transmission
Address Discovered?
Address Discovery
Address Known?
Data Discarded
16-bit Network
16-bit Network
16-bit Network
No
No
Yes
Yes
Route Discovered?
Route Discovery
Route Known?
No
No
Transmission
Successful
Chapter 2 ‐ RF Module Operation
Yes
Yes
Transmit Data
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