By Fred Eady
Книга Hands-On ZigBee: enforcing 802.15.4 with Microcontrollers Hands-On ZigBee: enforcing 802.15.4 with MicrocontrollersКниги English литература Автор: Fred Eady Год издания: 2007 Формат: pdf Издат.:Newnes Страниц: 352 Размер: 21 ISBN: 0123708877 Язык: Английский0 (голосов: zero) Оценка:Review"I suggest this publication to somebody doing 802.15.4 or ZigBee improvement. it's most probably that Eady touches at the platform you're or may be utilizing and it contrasts it good with every thing else out there." - William Wong, digital layout, August 2007 ebook DescriptionMaster ZigBee now! From simple recommendations to profitable tasks, renowned columnist Fred Eady teaches you the way to create a instant community with only one publication!
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Additional info for Hands-On ZigBee: Implementing 802.15.4 with Microcontrollers
0 ....... i0 . . . . . . . Sequence Frame = Acknowledgment . = = . . 00 000 . Mode: 16-bit PAN are Address short not ~eld address 0x0744 00 ff cf 00 00 00 ii 84 . . . . D .... 0 . . . . Capture Snippet 3. 3 give us some information about what the superframe will look like and who transmitted this Beacon. We've already discussed the macAssociationPermit attribute and you can see now where it is used. 3 MAC Payload Superframe Speci~cation: ............ .... iiii . . 0 . . 0 . .
00 . . . . . . Source Source 0000: 00 80 PAN Frame Pending not Beacon Intra PAN: Source Identi~er- Address: 0x0000 98 00 within and Acknowledgment the address PAN Mode: ~eld (0x0000) Addressing contains a (0x0002) 152 data Addressing present Reserved more Request: Not identi~er = Disabled • No required Destination = (0x0000) Enabled: Reserved = ............ 44 07 = = 00 . . . . . Number- Type- Security = o. 0 ....... i0 . . . . . . . Sequence Frame = Acknowledgment .
Only the privileged few get to party in the CFP. The CAP is a time within the superframe in which any device can attempt to use the services of the PAN by way of a slotted CSMA-CA methodology. The CFP time within the superframe is made up of blocks of time called GTSs. A GTS (Guaranteed Time Slot) is dedicated to a particular application, which most likely maps to an associated device or set of devices. Timecritical applications will generally be prime candidates for GTS slots, as the opportunity to collect or exchange data is always guaranteed at the same time in each superframe cycle.