Hydro Logger H40
User manual
16
electronics for ecology
FIEDLER
GSM FIELD STRENGTH DETECTION USING MOST
When installing the station, it is advisable to place its antenna in the place with the high-
est GSM field strength. The modem in the station converts the current measured field
strength into a number on a scale from 0 to 30 (the higher the number, the better the
location for the antenna).
Although the H40G station does not include a display or any buttons, the optimal antenna
location can be found using a laptop connected to the station with a patch cable.
When looking for the optimal location of the GSM antenna, proceed as follows:
▪
Connect a PC or laptop with the MOST software installed to the H40G using the
KP232/M12 cable.
▪
Start the MOST program and use the COM icon to establish communication with
the station.
▪
In the main menu select
"Info
" ->
"Current values
" and then in the "Main infor-
mation" window select the "Modem status" tab. This procedure will display the
following information window on your monitor:
▪
The "Operator", "Signal strength" and "Modem status" fields will not be filled in
until you instruct the station to log into the GSM network by pressing the "Switch
modem on" button.
▪
During login, the signal LED will flash at a frequency of approximately 1 Hz. After
the device has logged into the network, the regular flashing of the LED will
change to short light pulses with a period of about 5 s and the GSM operator
code and signal strength will appear in the "Modem status" information window.
For reliable transmissions it is advisable to find a location for the antenna such
that the field strength is 8 or more.
▪
After installing the antenna in the optimal location and after completing the over-
all parameterization of the station according to chapter 4, you can use the "Send
data" button to transfer the current settings (valid parameter file) and the last
measured values to the database on the server.
▪
Finally, don't forget to log off the device from the GSM network by pressing
the "Turn off modem" button.
If the H40G telemetry station is located in a place with a weak GSM field, it will be
forced to repeat some data calls, it will be difficult to log into the network and the
result will be a reduction in the above mentioned operation time. Therefore, when
installing the GSM antenna, always try to ensure its optimal location (see chapter:
Installation).
" M o d e m S t a t u s "
i n f o r m a t i o n w i n d o w
L E D s t a t u s
i n d i c a t i o n