XT09-MI【PDF 12/71 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

2.2. Modes of Operation

XTend RF Modules operate in six modes.

Figure ? 2 ‐ 04. XTend ? RF ? Module ? Modes ? of ? Operation

(RF ? modules ? can ? only ? be ? in ? one ? mode ? at ? a ? time)

2.2.1. Idle Mode

When not receiving or transmitting data, the RF module is in Idle Mode. The module shifts into the

other modes of operation under the following conditions:

? Transmit Mode: Serial data is received in the DI Buffer

? Receive Mode: Valid RF data is received through the antenna

? Shutdown Mode: Shutdown condition is met

? Sleep Mode: Sleep Mode condition is met

? Command Mode: Command Mode Sequence is issued

The module automatically transitions back to Idle Mode after responding to these conditions.

2.2.2. Transmit Mode

When the first byte of serial data is received from the UART in the DI buffer, the module attempts

to shift to Transmit Mode and initiate an RF connection with other modules. After transmission is

complete, the module returns to Idle Mode.

RF transmission begins after either of the following criteria is met:

1.

2.

RB bytes have been received by the UART and are pending for RF transmission.

[Refer to the RB (Packetization Threshold) Command]

At least one character has been received by the UART and is pending for RF transmission;

and RO character times of silence been observed on the UART.

[Refer to the RO (Packetization Timeout) Command]

Figure ? 2 ‐ 05. Transmit ? Mode ? Data ? Flow

The character timeout trigger can be

disabled by setting RO to zero. In this

case, transmission will not begin until

RB bytes have been received and are

pending for RF transmission. The RB

parameter may be set to any value

between 1 and the RF packet size [refer

to PK (Max RF Packet Size) parameter],

inclusive. Note that transition to Trans-

mit Mode cannot take place during RF

reception; the RF reception must com-

plete before the radio can transition into

Transmit Mode.

If RB or RO conditions are met, the

module initializes a communications channel. Serial data in the DI buffer is grouped into RF pack-

ets (up to 2048 bytes in each packet, refer to PK Command), converted to RF data and is transmit-

ted over-the-air until the DI buffer is empty.

? ? 2007 ? MaxStream, ? Inc.

????? 12

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