Fieldgate FXA42
Operation
Hauser
69
Connection supervision
The connection supervision will try to connect to the first URL whenever there has been no
payload traffic for the period of time indicated. The period can be specified between 60
and 60000 seconds. If the connection to the first URL fails, the second URL will be tried. If
the second URL also fails the cellular modem connection will be re-established.
• Use the connection supervision function if the cellular modem driver could have
problems recognizing the connection. Note that this function may produce
additional network traffic.
• Connection supervision may not be disabled if the cellular modem connection is
used as a fallback connection.
• The connection supervision must be enabled for applications that require
continuous data collection. The connection supervision function supervises the
cellular modem connection and resets the modem if the connection is broken.
• The predefined supervision URLs can only be reached with SIM cards that allow
access to the Internet.
Signal strength
To ensure a stable connection and an adequate performance of all the communication
functions of the device, make sure that the signal level is at least -79 dBm (Good).
Low signal strength may decrease the transmission speed significantly or completely drop
the connection and result in a loss of function of the device.
The correlation between signal strength and connection quality is provided in the
following table:
Signal strength
Connection quality
Under -101 dBm
Bad
-101 dBm to -90 dBm
Weak
-89 dBm to -80 dBm
Medium
-79 dBm to -65 dBm
Good
Over -65 dBm
Excellent
Critical applications
Cellular telecommunication devices operate using radio signals and therefore are not
guaranteed to have a reliable connection in all conditions. For reliable continuous data
transmission, do not rely exclusively on a wireless device.
Antenna
Keeping your body close to a cellular antenna might negatively affect your health. The use
of antennas with a gain factor of more than 2.3 dBi might require additional approval at
the place of operation.
Event log messages
The following section describes the messages that the cellular modem driver may log to
the event log. All messages are prefixed with the text
Cellular Modem Driver
.
Stopped
The cellular modem driver has been stopped.
Started
The cellular modem driver has been started.
Running
The cellular modem driver is now running.