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ARF868 Radio Modems- Guide utilisateur / User guide version V2.2.3
not require a specific protocol. Each octet transmitted is transferred into the air and vice versa.
Thanks to its low latency and the absence of a protocol on the UART port, the ARF868 modem used with the continuous asynchronous protocol
is completely transparent in the replacement of a wire link.
3.2.2 Implementation
The continuous asynchronous protocol is selected by the S222 register (cf §5.3).
It can use the following radio data rates: 2.4kbps, 9.6kbps, 38.4kbps and 57.6kbps. The adjustment of the radio data rate is done via the S254
register (cf § 5.3).
The notions of addressing (broadcast communication, group communication and addressed communication between products) are available and
described below.
3.2.3 Addressing
The product has various addressing modes that are configurable via the product registers. The following modes are available:
•
Transparent mode without sub-network
•
Transparent mode with sub-network
•
Addressed mode without sub-network
•
Addressed mode with sub-network
The transparent modes are intended for inter-product communication: all products are recipients of the frames transmitted. The addressed
modes enable communication to one or more products (creation of sub-groups).
Transparent mode without sub-network
•
In the Transparent mode without sub-network all products within range receive the frames from the transmitting products. The configura-
tion required for this mode of communication is as follows :
•
S220=0 (transparent mode)
•
S253=0 (no group)
Transparent mode with sub-network:
The sub-networks enable groups of products to be created that communicate with each other within the same sub-network. Products in
sub-network 1 cannot see those in sub-network 2 and vice versa. On the other hand all the products are visible between themselves within the
same sub-network.
•
S220=0 (transparent mode)
•
S253=Number of the sub-network varying from 1 to 255
when register S253 is set to 255, the frame is broadcast to the whole of the sub-network.
Addressed mode without sub-network:
In the addressed mode without sub-network a product communicates with a specified addressee. Only the addressee receives the frames from
the transmitting products. The configuration required for this mode of communication is as follows:
•
S220=1 (address mode)
•
S253=0 (no sub-network)
•
S252=local address (16 bit address)
•
S256=address of the recipient (16 bit address)
When register S256 is set to 65535, the frame is broadcast and visible by all equipment within range.
Addressed mode with sub-network:
The products always communicate within the same sub network. This means that two products with identical addresses and different sub-net-
work numbers do not communicate with each other. The only case of inter-network communication is when S256=255 and S253=255.
•
S220=1 (address mode)
•
S253= sub network number varying from 1 to 255 (255 is used for broadcast between the sub-network)
•
S252= local address (address on 8 bits)
•
S256= recipients address (address on 8 bits, 255 is the broadcast address within the sub-network)
3.3. Legacy X3-PRO protocol
The "legacy X3-PRO" protocol provides the ARF868 modem with total "air" compatibility with the previous generation adeunis® X3-PRO
type modems.
Compatibility is provided for Narrowband and Wideband modes, and for Addressed and Transparent modes.
Please refer to the dedicated application note: ARF868 Radio Modems: «Legacy X3-PRO» mode, available on our website.
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