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參數資料
| 型號： | XBIB-U |
| 廠商： | Digi International/Maxstream |
| 文件頁數： | 21/72頁 |
| 文件大?。?/td> | 1116K |
| 描述： | BOARD USB ZIGBEE MOD PRO |
| 設計資源： | XBIB-U Shematic |
| 標準包裝： | 1 |
| 附件類型： | 接口板 |
| 適用于相關產品： | XBee 和 XBee Pro 收音機 |
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XBee/XBeePRO"燨EM燫F燤odules??02.15.4?爒1.xAx燵2007.05.031]
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Direct Transmission
A NonBeaconing Coordinator can be configured to use only Direct Transmission by setting the SP
(Cyclic Sleep Period) parameter to 0 . Also, a NonBeaconing Coordinator using indirect transmis-
sions will revert to direct transmission if it knows the destination module is awake.
To enable this behavior, the ST (Time before Sleep) value of the Coordinator must be set to match
the ST value of the End Device. Once the End Device either transmits data to the Coordinator or
polls the Coordinator for data, the Coordinator will use direct transmission for all subsequent data
transmissions to that module address until ST time (or number of beacons) occurs with no activity
(at which point it will revert to using indirect transmissions for that module address). No activity
means no transmission or reception of messages with a specific address. Global messages will not
reset the ST timer.
Indirect Transmission
To configure Indirect Transmissions in a PAN (Personal Area Network), the SP (Cyclic Sleep Period)
parameter value on the Coordinator must be set to match the longest sleep value of any End
Device. The SP parameter represents time in NonBeacon systems and beacons in Beacon-enabled
systems. The sleep period value on the Coordinator determines how long (time or number of bea-
cons) the Coordinator will retain an indirect message before discarding it.
In NonBeacon networks, an End Device must poll the Coordinator once it wakes from Sleep to
determine if the Coordinator has an indirect message for it. For Cyclic Sleep Modes, this is done
automatically every time the module wakes (after SP time). For Pin Sleep Modes, the A1 (End
Device Association) parameter value must be set to enable Coordinator polling on pin wake-up.
Alternatively, an End Device can use the FP (Force Poll) command to poll the Coordinator as
needed.
CCA (Clear Channel Assessment)
Prior to transmitting a packet, a CCA (Clear Channel Assessment) is performed on the channel to
determine if the channel is available for transmission. The detected energy on the channel is com-
pared with the CA (Clear Channel Assessment) parameter value. If the detected energy exceeds
the CA parameter value, the packet is not transmitted.
Also, a delay is inserted before a transmission takes place. This delay is settable using the RN
(Backoff Exponent) parameter. If RN is set to 0 , then there is no delay before the first CCA is per-
formed. The RN parameter value is the equivalent of the minBE parameter in the 802.15.4 spec-
ification. The transmit sequence follows the 802.15.4 specification.
By default, the MM (MAC Mode) parameter = 0. On a CCA failure, the module will attempt to re-
send the packet up to two additional times.
When in Unicast packets with RR (Retries) = 0, the module will execute two CCA retries. Broadcast
packets always get two CCA retries.
Acknowledgement
If the transmission is not a broadcast message, the module will expect to receive an acknowledge-
ment from the destination node. If an acknowledgement is not received, the packet will be resent
up to 3 more times. If the acknowledgement is not received after all transmissions, an ACK failure
is recorded.
相關PDF資料 |
PDF描述 |
|---|---|
| XIB-E | BOARD INTERFACE ETHERNET |
| XIB-R | BOARD INTERFACE RS232/485 |
| ZMN2400HPDB | BOARD ROUTER DEV ZIGBEE 100MW |
| ZMN24HPDK-B | KIT DEV W/ZIGBEE ZMN2400HP |
| ZNI1000TC | IC TEMP SENSOR NI1000 SOT23-3 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 產品:Evaluation Boards 類型:RS-485 工具用于評估: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 產品:Evaluation Boards 類型:RS-485 工具用于評估: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 產品:Evaluation Boards 類型:RS-485 工具用于評估: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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