Digi XStream-PKG-R RS-422 Guide de l'utilisateur télécharger pdf (Page 18)

9XTend™ RS-232/422/485 RF Modem User’s Guide

3.2.3. Receive Mode

If a modem detects RF data while operating in Idle Mode, the modem transitions to Receive Mode

to start receiving RF packets. Once a packet is received, the modem checks the CRC (cyclic redun-

dancy 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 proceeds to the

DO Buffer.

Figure 3-06. Receive Mode Data Flow

* Refer to the ‘Address Recognition’ sec-

tion for more information regarding

address recognition.

The modem returns to Idle Mode

when valid RF data is no longer

detected or after an error is

detected in the received RF data. If

serial data is stored in the DI

buffer while the modem is in

Receive Mode, the serial data will

be transmitted after the modem is

finished receiving data and returns

to Idle Mode.

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Digi XStream-PKG-R RS-422 Guide de l'utilisateur Page 18