Chapter 5 Functional principle
5.4 ALOHA transmission mode
ALOHA transmission mode is a special connection mode whereby the myDatalogEASYplus
establishes a connection to the myDatanet server for a period of time configured via the "Basic
settings" configuration section (see "Aloha/wakeup duration" in chapter "Basic settings" on page
96).
There are two options for initiating the ALOHA transmission mode:
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Directly on the device by means of the solenoid switch (see "Solenoid switch" on page 65) or
button (see "Button" on page 64).. The GSM network is re-selected during this process. This
means that a list of all of the GSM networks in the receiving range of the device is created
from which the strongest GSM network is then selected that is not on the "Ban list" (see "Ban
list" on page 38) and that is part of one of the service providers supported by the integrated
SIM chip (see www.microtronics.at/footprint). The internal fault counter is pre-initialised in
such a way that if it was not possible to log into the selected GSM network, it is immediately
added to the "Ban list". In this case, the next GSM network from the previously created list is
used immediately. If the connection with all of the available GSM networks fails, the ban list is
deleted and the connection attempt is aborted. If ALOHA transmission mode is then initiated
again, the ban list is empty and all of the GSM networks in the receiving range, that are part of
one of the service providers supported by the integrated SIM chip, are taken into
consideration when selecting the network. The network selection also takes into consideration
whether GPRS is available on the selected GSM network.
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Via the myDatanet server if the "Interval & wakeup" connection type has been selected (see
"Basic settings" on page 96).
A speech bubble in the measurement instrument list (see "myDatanet Server Manual " 805002)
with the title "Aloha" indicates that a device is in ALOHA transmission mode.
Clicking on the speech bubble with the "Aloha" title opens the ALOHA data window (see
"myDatanet Server Manual " 805002), which comprises the internal "voltage", "GSM level" and
"battery" measurement values, as well as the measurement values of the 4 universal inputs. The
measurement values for the last thirty minutes are always shown in the ALOHA data window, which
means that data from a previous ALOHA transmission may be included. The ALOHA data is
generated every three seconds independently of the normal measurement value and is thus not
saved with the standard measurement data.
If a measurement dataset is recorded during ALOHA transmission mode, it is immediately transferred
to the myDatanet server and saved in the standard measurement data.
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