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參數(shù)資料
| 型號(hào)： | XBIB-U |
| 廠商： | Digi International/Maxstream |
| 文件頁數(shù)： | 16/72頁 |
| 文件大?。?/td> | 1116K |
| 描述： | BOARD USB ZIGBEE MOD PRO |
| 設(shè)計(jì)資源： | XBIB-U Shematic |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 附件類型： | 接口板 |
| 適用于相關(guān)產(chǎn)品： | XBee 和 XBee Pro 收音機(jī) |
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2.3.3. Association
Association is the establishment of membership between End Devices and a Coordinator and is
only applicable in NonBeacon (w/ Coordinator) networks. The establishment of membership is
useful in scenarios that require a central unit (Coordinator) to relay messages to or gather data
from several remote units (End Devices), assign channels or assign PAN IDs.
An RF data network that consists of one Coordinator and one or more End Devices forms a PAN
(Personal Area Network). Each device in a PAN has a PAN Identifier [ID (PAN ID) parameter]. PAN
IDs must be unique to prevent miscommunication between PANs. The Coordinator PAN ID is set
using the ID (PAN ID) and A2 (Coordinator Association) commands.
An End Device can associate to a Coordinator without knowing the address, PAN ID or channel of
the Coordinator. The A1 (End Device Association) parameter bit fields determine the flexibility of
an End Device during association. The A1 parameter can be used for an End Device to dynamically
set its destination address, PAN ID and/or channel.
Coordinator / End Device Setup and Operation
To configure a module to operate as a Coordinator, set the CE (Coordinator Enable) parameter to
1. Set the CE parameter of End Devices to 0 (default). Coordinator and End Devices should con-
tain matching firmware versions.
NonBeacon (w/ Coordinator) Systems
In a NonBeacon (w/ Coordinator) system, the Coordinator can be configured to use direct or indi-
rect transmissions. If the SP (Cyclic Sleep Period) parameter is set to 0, the Coordinator will send
data immediately. Otherwise, the SP parameter determines the length of time the Coordinator will
retain the data before discarding it. Generally, SP (Cyclic Sleep Period) and ST (Time before Sleep)
parameters should be set to match the SP and ST settings of the End Devices.
Coordinator Power-up
Coordinator power-up is governed by the A2 (Coordinator Association) command. On power-up,
the Coordinator undergoes the following sequence of events:
1. Check A2 parameter- Reassign_PANID Flag
Set (bit 0 = 1) - The Coordinator issues an Active Scan. The Active Scan selects one channel
and transmits a BeaconRequest command to the broadcast address (0xFFFF) and broadcast
PAN ID (0xFFFF). It then listens on that channel for beacons from any Coordinator operating on
that channel. The listen time on each channel is determined by the SD (Scan Duration) param-
eter value.
Once the time expires on that channel, the Active Scan selects another channel and again
transmits the BeaconRequest as before. This process continues until all channels have been
scanned, or until 5 PANs have been discovered. When the Active Scan is complete, the results
include a list of PAN IDs and Channels that are being used by other PANs. This list is used to
assign an unique PAN ID to the new Coordinator. The ID parameter will be retained if it is not
found in the Active Scan results. Otherwise, the ID (PAN ID) parameter setting will be updated
to a PAN ID that was not detected.
Not Set (bit 0 = 0) - The Coordinator retains its ID setting. No Active Scan is performed.
For example: If the PAN ID of a Coordinator is known, but the operating channel is not; the A1
command on the End Device should be set to enable the Auto_Associate and
Reassign_Channel bits. Additionally, the ID parameter should be set to match the PAN ID of
the associated Coordinator.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XBIB-U-DEV | 功能描述:界面開發(fā)工具 USB XBee-PRO profes onal interface board RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評(píng)估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| XBIB-U-SP | 功能描述:界面開發(fā)工具 USB/Xbee/Xbee-Pro Inf Brd SMT Pads RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評(píng)估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| XBIB-U-SS | 功能描述:界面開發(fā)工具 USB/Xbee/Xbee-Pro Inf Brd SMT Skt RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評(píng)估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| XBL6450BYFVR | 制造商:Texas Instruments 功能描述:ECS BLUELINK - Tape and Reel |
| XBL6450YFHR | 制造商:Texas Instruments 功能描述: |
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