Ref. 08-07-V5-lmn
p. 9
A
RF44
User Guide
Tips 2 :
Idle line for S214
duration
+++ (consecutive)
Idle line for S214
duration
+
+
+
TRANSCEIVER MODE
COMMAND
MODE
RXD
line
Exiting command mode
(return back in transceiver mode): send the serial
command
ATO <cr>
Transceiver mode
In transceiver mode, the module works with a transparent protocol: When
transmitting, data received from the serial link are transmitted on the radio
link. When data are received on the radio link, these data are sent on the
serial link. The module acts as a wire serial link.
The communication is always half-duplex. The radio transmission is
processed prior to the radio reception (when the transceiver is sending a
radio frame, it is not able to decode any incoming radio frame).
If no data are sent on the serial link, the modem is waiting for radio
reception. Each radio frame sent by another modem is received and the
validated data extracted from the radio frame are sent on the serial link.
All the data received on the serial link are encapsulated in a radio frame.
When acting as transceiver, the radio frame transmission starts as soon has a
char is available on the serial link.
The radio frame format is :
<Preamble><synchro>DATA <postambule>.
Preamble, synchronisation and postambule are used for the radio reception.
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