Microtronics myDatalogNANOamr, User Manual

Page: 23 / 125

Chapter 5 Functioning principle
5.1 ALOHA transmission mode
ALOHA transmission mode is a special connection mode whereby the myDatalogNANOamr
establishes a connection to the myDataweb server for a period of time configured via the "Basic
settings" configuration section (see "Aloha/wakeup duration" in chapter "Basic setting" on page
53).
ALOHA transmission mode is initiated directly on the device by means of a solenoid switch (see
"Solenoid switch" on page 45). 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 first
GSM network is then selected that is not on the "Ban list" (see "Ban list" on page 24) and that is
part of one of the service providers supported by the integrated SIM chip (see
www.microtronics.at/footprint).
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). It comprises the internal "GSM level" and "battery"
measurement values, as well as the measurement values of the 4 meter 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 values 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 myDataweb server and saved in the standard measurement data.
5.2 Selection of the GSM network
The GSM network to which the device should register must be selected, as the myDatalogNANOamr
is equipped with a SIM chip that provides a mobile connection via a variety of international service
providers (see www.microtronics.at/footprint ). This is completed automatically by the device. During
this process it is taken into consideration if a connection to a certain GSM network is possible but
the use of this GSM network repeatedly causes transmission errors. Such a GSM network is added to
a ban list and is ignored during the next login attempt.
The following conditions ensure that the myDatalogNANOamr logs itself into a GSM network:
l
PowerOn
l
Initiation of ALOHA transmission mode (see "ALOHA transmission mode" on page 23)
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