Sutron Corporation Satlink Operations & Maintenance Manual, Rev 8.04.2 11/3/2016 pg. 125
12.2.2.
Two-Way Communication
When the cell modem is online, you may use LinkComm to download the log, change the setup,
check the status, upgrade the firmware, and do almost any other operation that can be done
over USB.
12.2.3.
Scheduled Transmissions
Scheduled transmissions over cell are similar to Environmental Satellite Scheduled
transmissions. Satlink is set up with a time and interval dictating how often to deliver data. At
designated times, Satlink will power up the modem, establish a connection to the internet, get in
touch with the server and deliver the data. To use scheduled transmissions, Satlink needs to be
set up with the internet address of a primary server and, optionally, a backup server so that it
knows where to deliver the data. The backup server is contacted only if the primary server
cannot be reached.
If internet service is not an option, Satlink may be setup to transmit data via SMS (text
messages). Data can be delivered to up to three cell phone numbers for each telemetry setup.
12.2.4.
Listening
An Satlink can be set up to always be listening, which means that it will act as a server, accepting
TCP/IP incoming connections. Sutron's AutoPoll PC software can periodically reach out to a
listening Satlink station and collect sensor data from Satlink. In the listening mode, Satlink will
keep the modem on at all times, resulting in higher power consumption.
The transmission status (use LinkComm's Telemetry tab or issue STATUS TX command) indicates
the IP address assigned to Satlink by the service provider. The
Listen Port
setting determines
which port Satlink remains open.
You can send Satlink a message with the LISTEN command that would cause it to temporarily go
into listening mode.
Listening is automatically turned on by Satlink for 10 minutes :
At boot up
When the station is connected to, whether via USB, over the modem, or over Wi-Fi
When an SMS is received
When the front panel button is pressed, and when the station goes into alarms, listening is
automatically turned on for one hour.
12.2.5.
SMS Transmissions
Satlink can use SMS (text messages) to deliver sensor data.
12.3.
Missing Data Retrieval
In the case of transmission failures, Satlink offers several ways of retrieving the data from the
missing transmissions. Only sensor data collected and logged by Satlink may be retrieved; data
handed to Satlink by other loggers may not be retrieved in this fashion.
12.3.1.
On Site Data Retrieval
To retrieve missing data when on-site, download Satlink’s log. Either use a USB thumb drive or
connect to Satlink with LinkComm in order to download the log.
