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ARF868 Radio Modems - Guide utilisateur / User guide version V2.2.2
3. Data exchange – Communication mode
Principe :
The communication mode is the default mode.
On switching on the modem is configured in RS232, 9.6kbps (serial link), 2.4kbps (RF data rate).
By default, the modem is in permanent listening mode of the RF interface and the UART port.
•
As soon as a frame from the RF link is demodulated, its content is transmitted to the UART port
FR
•
As soon as a character chain is detected on the UART port, it is transmitted to the RF link.
"Air" communication takes place according to the following choice of protocols:
•
Packetized secured or non-secured
•
Continuous asynchronous (default mode)
•
"Legacy X3Pro" continuous asynchronous
EN
3.1. Packet protocol
3.1.1 Protocol description
ARF868 modem uses a packet oriented protocol on its RF interface. The data coming from the UART interface are accumulated in an internal fifo
in the module and then encapsulated in an RF frame. The maximum amount of data that can be transferred into a single radio packet can reach
1024 Bytes.
The maximum packet size can be set up in S218 register from 1 to 1024 bytes. Each new packet introduces some latency in the transmission
delay caused by the RF protocol overhead. The RF protocols encapsulate the data payload with the following elements:
CONTINUOUS
PACKETIZED
SECURED
ASYNCHRONOUS
PACKETIZED
SECURED
LEGACY X3-
CONTINUOUS
Transparent
Adressed
Adressed
Transparent
NON
Adressed
Transparent
PRO
Adressed
With sub-
network
Without sub-
network
Without sub-
network
With sub-
network
Without sub-
network
With sub-
network
Without sub-
network
Repeater
With sub-
network
Without sub-
network
Repeater
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