XT09-MI【PDF 13/71 页】MODULE RF 900MHZ 1W 115K W/MMCX

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9XTend? ? OEM ? RF ? Module ?‐? Product ? Manual ? v2.x4x ? [2007.01.04]

Chapter ? 2 ?‐? RF ? Module ? Operation

Channel initialization is the process of sending an RF initializer that synchronizes receiving mod-

ules with the transmitting module. During channel initialization, incoming serial data accumulates

in the DI buffer.

RF data, which includes the payload data, follows the RF initializer. The payload includes up to the

maximum packet size (PK Command) bytes. As the TX module nears the end of the transmission,

it inspects the DI buffer to see if more data exists to be transmitted. This could be the case if more

than PK bytes were originally pending in the DI buffer or if more bytes arrived from the UART after

the transmission began. If more data is pending, the transmitting module assembles a subsequent

packet for transmission.

Refer to the ‘RF Communication Modes’ section to view state diagrams that illustrate channel ini-

tialization and the sequence of events that follow.

RF Packet

Figure ? 2 ‐ 06. RF ? Packet ? Components

* When streaming multiple RF packets, the RF Initializer is only sent in front of the first packet.

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 matching a Hopping Channel, VID and Destination Address. Data that does not

pass through all three network filter layers is discarded.

Refer to the ‘Addressing’ section of the “RF Communication Modes” chapter for more information.

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 [refer to the ‘Receive Mode’ section].

? ? 2007 ? MaxStream, ? Inc.

????? 13

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