Digi 9XCite-PKG Manual descargar pdf (Pagina 14)

9XCite‐PKG‐R™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc. 14

3.2.3. Receive Mode

If a modem detects RF transmitted data while operating in Idle Mode, it transitions into Receive

Mode to start receiving packets. Once a packet is received, it goes through the receiving-end of a

CRC (cyclic redundancy check) to ensure that the data was transmitted without error. If the CRC

data bits on the incoming packet are invalid, the packet is discarded. If the CRC is valid, the packet

is placed the DO Buffer. This process is shown in the figure below:

Figure3‐05. ReceiveModeDataFlow

The modem returns to Idle Mode after valid data is no longer detected or once an error is detected

in the received data. If serial data-to-transmit is stored in the DI buffer while the modem is giving

precedence to Receive Mode, the data will be transmitted after the modem finishes receiving data

and returns to Idle Mode.

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Digi 9XCite-PKG Manual Pagina 14