9XCite"燨EM燫F燤odule?燩roduct燤anual爒2.1燵2007.01.04]
2007燤axStream,營nc.
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2.2. Modes of Operation
XCite RF Modules operate in five modes.
Figure?04. Modes爋f燨peration
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)
" Sleep Mode (Sleep Mode condition is met)
" Command Mode (Command Mode Sequence is issued)
2.2.2. Transmit Mode
When the first byte of serial data comes through the DI Pin and arrives in the DI Buffer, the
modem transitions into Transmit Mode. Once in Transmit Mode, the modem initializes a communi-
cations channel. During channel initialization, incoming serial data accumulates in the DI buffer.
After the channel is initialized, data in the DI buffer is grouped into packets (up to 64 bytes in each
packet) and is transmitted. The modem continues to transmit data packets until the DI buffer is
empty. Once transmission is finished, the modem returns to Idle Mode. This progression is shown
below:
Figure?05. Transmission爋f燿ata
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