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4.3.4 System
operation in
FTP mode
4.3.5 Some advantages
4-20
Point to Point and FTP Communication
After initial installation, there is no direct communication between remote
stations set for FTP mode and controller PC.
A User's FTP server with a static IP address (or, at least, with a numeric alias
if dynamic) is always necessary, presuming availability of the 4G GSM signal
at the remote station installation site, for AMS-8061 to download data to the
server itself.
When connecting to the server, the remote station will check for the existence
of any request to modify its settings or to download results related to some
specific time interval.
In case, the station will proceed accordingly, by changing its settings or by
downloading the requested data. If no special requests are found, the station
downloads all measurement results, which have been acquired since the
previous access to the server.
To avoid energy wasting, and generating undesired electromagnetic fields,
that would be measured by the station itself, the station modem, which allows
communication with the FTP server, should be set to be off for the major part
of the day.
At the programmed time, set by the User, the modem switches on and the
station access the ftp server to download its results.
Depending on the setting decided by the User, various abnormal conditions
regarding field strength and station operation, generate alarm events able to
immediately switch on the modem to access the server and/or send SMS to
the user's mobile phone (where available).
Being the modem a power consuming component, it is advisable to avoid
programming the station to access the server more than once a day to avoid,
especially during bad weather periods, affecting the energy balance between
solar panel (where installed) and battery backup.
The main interface to the system, from the operator side, is the controller PC.
When desired, through the control software 8061SW-02, the User can select
one of the remote stations from the list and access its folder opening a ftp
connection to the server.
All data not already downloaded from the server to the controller PC are then
downloaded, and eventually a new setting file, if requested by the User, is
transferred to the server to be read by the station when it will access the
server.
The controller PC needs a full internet connection allowed for FTP (File
Transfer Protocol).
Due to the network signal quality, it may happen, sometimes, that the
station is not able to access the ftp server at the scheduled time. No
data will be anyway loss: it will be downloaded at the next connection.
Any remote unit (AMS-8061 area monitor) downloads its data to the FTP
server, at scheduled time, according to the User settings.
The controller PC is able to retrieve them whenever desired, without any need
to establish a direct connection to the remote station.
Integrity check of transmitted data is automatically performed by the remote
station.
In case of network bad signal quality, remote stations automatically try several
times to access the network and download measurement results.
The small dimensions of data files normally transferred by our systems make
it convenient to choose telephone charges based on data volume usually
available for GSM/GPRS service.
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