XStream"燨EM燫F燤odule?燩roduct燤anual爒5.x00燵2006.02.24]?/DIV>
Figure?05. Data燭ransmission燬equence?/DIV>
RF Data Packet
Figure?06. RF燚ata燩acket?/DIV>
*燱hen爏treaming爉ultiple燫F爌ackets,爐he燫F營nitializer爄s爋nly爏ent爄n爁ront爋f爐he爁irst爌acket.?/DIV>
RF Initializer
An RF initializer is sent each time a new connection sequence begins. The RF initializer contains
channel information that notifies receiving modules of information such as the hopping pattern
used by the transmitting module. The first transmission always sends an RF initializer.
An RF initializer can be of various lengths depending on the amount of time determined to be
required to prepare a receiving module. For example, a wake-up initializer is a type of RF
initializer used to wake remote modules from Sleep Mode (Refer to the FH, LH, HT and SM
Commands for more information). The length of the wake-up initializer should be longer than the
length of time remote modules are in cyclic sleep.
Header
The header contains network addressing information that filters incoming RF data. The receiving
module checks for a matching Hopping Channel (HP parameter), Vendor Identification Number
(ID parameter) and Destination Address (DT parameter). Data that does not pass through all
three network filter layers is discarded.
CRC (Cyclic Redundancy Check)
To verify data integrity and provide built-in error checking, a 16-bit CRC (Cyclic Redundancy
Check) is computed for the transmitted data and attached to the end of each RF packet. On the
receiving end, the receiving module computes the CRC on all incoming RF data. Received data
that has an invalid CRC is discarded [See Receive Mode section, next page].
牋牘?006燤axStream,營nc.燙onfidential燼nd燩roprietary?/DIV>
12?/DIV>
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