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XB24CZ7RIS-004 参数 Datasheet PDF下载

XB24CZ7RIS-004图片预览
型号: XB24CZ7RIS-004
PDF下载: 下载PDF文件 查看货源
内容描述: XBee® /的XBee - PRO® ZB SMT射频模块 [XBee®/XBee-PRO® ZB SMT RF Modules]
分类和应用: 射频
文件页数/大小: 155 页 / 3791 K
品牌: DCD [ DIGITAL CORE DESIGN ]
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XBee®/XBeePRO® ZB SMT RF Modules  
Parent Connectivity  
The XBee ZB end device sends regular poll transmissions to its parent when it is awake. These poll  
transmissions query the parent for any new received data packets. The parent always sends a MAC layer  
acknowledgment back to the end device. The acknowledgment indicates whether the parent has data for the  
end device or not.  
If the end device does not receive an acknowledgment for 3 consecutive poll requests, it considers itself  
disconnected from its parent and will attempt to discover and join a valid ZigBee network. See "Managing End  
Devices" chapter for details.  
Resetting the End Device  
When the end device is reset or power cycled, if the orphan scan successfully locates a parent, the end device  
then checks its PAN ID, operating channel and stack profile against the network configuration settings (ID, SC,  
ZS). It also verifies the saved security policy is valid based on the security configuration commands (EE, KY). If  
the end device's PAN ID, operating channel, stack profile, or security policy is invalid, the end device will leave  
the network and attempt to join a new network based on its network joining command values.  
To prevent the end device from leaving an existing network, the WR command should be issued after all  
network joining commands have been configured in order to retain these settings through power cycle or reset  
events.  
Leaving a Network  
There are a couple of mechanisms that will cause the router to leave its current PAN and attempt to discover  
and join a new network based on its network joining parameter values. These include the following:  
• The ID command changes such that the current 64-bit PAN ID is invalid.  
• The SC command changes such that the current operating channel (CH) is not included in the channel  
mask.  
• The ZS or any of the security command values change.  
• The NR0 command is issued to cause the end device to leave.  
• The NR1 command is issued to send a broadcast transmission, causing all devices in the network to leave  
and migrate to a different channel.  
• The commissioning button is pressed 4 times or the CB command is issued with a parameter of 4.  
• The end device's parent is powered down or the end device is moved out of range of the parent such that  
the end device fails to receive poll acknowledgment messages.  
Note that changes to command values only take effect when changes are applied (AC or CN commands).  
Example: Joining a Network  
After starting a coordinator (that is allowing joins), the following steps will cause an XBee end device to join the  
network:  
1. Set ID to the desired 64-bit PAN ID, or to 0 to join any PAN.  
2. Set SC to the list of channels to scan to find a valid network.  
3. If SC or ID is changed from the default, apply changes (make SC and ID changes take effect)  
by issuing the AC or CN command.  
4. The Associate LED will start blinking once the end device has joined a PAN.  
5. If the Associate LED is not blinking, the AI command can be read to determine the cause of join  
failure.  
6. Once the end device has joined, the OP and CH commands will indicate the operating 64-bit  
PAN ID and channel the end device joined.  
7. The MY command will reflect the 16-bit address the router received when it joined.  
8. The API Modem Status frame ("Associated") is sent out the serial port when using API mode.  
9. The joined end device will attempt to enter low power sleep modes based on its sleep  
configuration commands (SM, SP, SN, ST, SO).  
© 2010 Digi International, Inc.  
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