ADEUNIS ARF73 Manual de usuario descargar pdf (Pagina 13)

RF73

User Guide

Ref. 09-07-V1-smn p 11

Transparent mode

In transparent mode, the modem acts as a wired serial link. It means that

alternately, the modem sends on the radio the data received from the serial

link and sends on the serial link the data received from the radio.

The radio frame format is :

• <Preamble><synchro>DATA <postambule>.

Preamble, synchronisation and postambule are used for the radio

reception.

Addressed mode

In addressed mode, data received on the serial link are sent on the radio link

with the following format:

• <Preamble><synchro><Address> DATA <postambule>.

Preamble, synchronisation and postambule are used for the radio

reception.

• The Address field is set up with S256 value.

• In reception mode: The <Address> field of the radio frame is

checked with the reception address contained in S252

• If the radio frame address matches the transceiver reception

address (S252), DATA (and only DATA) are transmitted on the

serial link

Otherwise received data are silently discarded.

Transceiver state machine

When operating in transceiver mode the 'RF transmission' state machine is:

Idle state of the transceiver: by default the transceiver is waiting for

incoming data on the RS232 link and for incoming radio frame on the radio

link.

The RS232 link has a higher priority than the radio link (if a radio frame is

demodulated meanwhile some RS232 characters are detected on the serial

link, the radio frame will be discarded and the RS232 incoming data will be

processed).

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ADEUNIS ARF73 Manual de usuario Pagina 13