User's Manual

x The battery status of the tag
x Button press status
x The temperature of the tag
Mesh nodes listen for these beacon messages by filtering on a unique message type-identifier in
each message. In addition, both advertisements from tags and communication from mesh nodes are
filtered based on white listing
1
at a system level.
The mesh node can update its own firmware if supplied signed over the mesh network.
Specification of frequency band(s), power output and power management
The SRT MN-01 operates in the non-licensed sub-GHz band with following characteristics:
x Sub-GHz
x 865-868 (EU wide harmonised national radio interfaces from 25 MHz to 1 000 MHz –
L Band)
x 902-928 MHz (FCC)
x PCB Antenna +2.33 dBi gain
x External antenna +0,9dBi gain
x TX power +14dBm
x 2,4 GHz Prop mode #1 (2.4 - 2.4835GHz)
x TX power +20dBm
x Antenna – PCB (1.5dBi gain)
x 2,4 GHz Bluetooth (2.4 - 2.4835GHz)
x TX power +4 dBm
x Antenna – PCB (3,3 dBi gain)
The frequency to use for the mesh network is chosen by the onboard gateway computer and is not
overridable by users. Selection of frequencies are done by using GPS geofencing based on the work
done by marineregions.org in addition to frequency-scheme for the relevant territorial seas.
http://www.marineregions.org/downloads.php (Maritime Boundaries v11 - World 12 Nautical Miles
Zone (Territorial Seas) v3 (2019-11-18)
(demo can be found here:
http://www.marineregions.org/eezdetails.php?mrgid=5686&zone=eez_12nm)
Power usage
x ~ 10-65 mA at max power
Specification of modulation type and data protocol
The mesh nodes communicate by using the following modulations and protocols
Medium
Frequency
Modulation
Protocol
Radio
865-868MHz
GFSK
SRT-Mesh
Radio
902-928
DSSS
SRT-Mesh
Radio
2,4-2,4835GHz
O-QPSK DSSS
SRT-Mesh
Radio
2,4-2,4835GHz
GFSK
Bluetooth
USB-Cable to Gateway
Serial
Serial
Serial
1
https://en.wikipedia.org/wiki/Whitelisting