24
ATIM_ACW-MR4_UG_EN_V1.5
Frames format
Sigfox and LoRaWAN
Uplink frame
Byte 1
Byte 2
. . .
Byte n
Frame header
Frame-specific data
We can differentiate three types of frames:
•
Classic frame; New generation
: Very close to the old frames, the difference is that you can activate the timestamp.
These are for example the life frame, the error frame, the response to configuration frames, ... These last frames
are common to all ACWs but, it is also possible to have other independent frames for each ACWs.
•
Measurement frame; New generation
: These frames consist of samples of the different values of each of the
channels that an ACW can read. Beforehand, the number of samples and the depth of the history will be inserted
in the header
.
NOTE
The number of samples and the depth of the history are in common for all the channels of the frame.
•
Alert frame (threshold crossing); New generation
: These frames combine a conventional frame and a
measurement frame. They consist of a header warning that a threshold has been exceeded, followed by samples
of each of the channels for which a threshold has been exceeded.
Classic frame
If Timestamp is enabled, 4 bytes with the value of the Timestamp will precede the header (byte 1).
Byte 1 - header
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
New
generation
= 1
Timestamp =
1 - enabled
0 - disabled
Measurement
frame
= 0
Reserved
= 0
Type of frame