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sigfox RC1 ANALOG PWR - Guide utilisateur / User guide version V2.0.2
4.2. Downlink frames
SIGFOX technology allows up to 4 downlink messages to be transmitted (from the network to the product) per day
depending on the subscription.
A downlink message is in fact an acknowledgment of receipt of an uplink frame with a request for acknowledg-
ment. This means that, to receive a message on the product, an uplink frame (from the product to the network)
must indicate an acknowledgment wait.
This acknowledgment downlink frame is an 8 byte message defined for the adeunis® product in the following two
paragraphs.
Hence the product sends an uplink frame with the ACK field enabled, it then returns to standby for twenty seconds
before opening a reception window (RX window) for a maximum of 30 seconds, in accordance with the diagram
below:
The configuration of the sending policy of the acknowledgment request in the adeunis® product differs according
to whether the product is in periodic or event mode:
• In periodic mode: the transmission period for the event counters (register 301) allows us to know the number of
uplink frames that the product will send per day. This number is divided by the number of downlink frames per day
(register 307) and allows us to set the schedule of acknowledgment requests so that the network can transmit its
downlink frames.
• In the event mode: the only known periodicity is that of the Keep Alive frame, defined by register 300, because
it is possible that no event occurs in 24 hours. The acknowledgment requests and hence the possibilities for the
network to transmit this data are determined by the periodicity of the Keep Alive frame (register 300).
E.g.:
• The product is running in the periodic mode
O S301 = 6 i.e. a periodicity of sending of frames of 60min, every hour or 24 times per day.
O S307 = 4, we wish to perform 4 downlink frames per day
O Result: The value of S301 gives us 24 frames per day that are divided by the value of S307 to obtain the result
of 6. Thus for all 6 Periodic frames the acknowledgment request will be transmitted thus enabling the network to
send a downlink frame.
• The product is running in the event mode
O S300 = 36 i.e. a periodicity of sending of frames of 360min, i.e. Every 6 hours or 4 times per day.
O Result: the acknowledgment request will be transmitted 4 times per day thus enabling the network to send a
downlink frame.
Caution: The configuration of the downlink frames has impacts on consumption and therefore on the life of the
product since it must then open listening windows and no longer be in standby. On the other hand, as the SIGFOX
network limits to 4 the number of downlink frames if the product configuration allows us to do a lot more, there
will be no more response from the network and the acknowledgment that the product is waiting for will not come.
4.2.1
Product configuration request frame
This frame allows to inform the product via the network that it must resend the product configuration uplink frame
(0x10).
0
1
Code
0x01
X
2
3
X
X
4
5
PAYLOAD
X
X
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