DTU4x0 GPRS/NB-IoT Data Loggers
User Guide. r. 2.01 | 2022-05-17
Tel.: +420 234 076 670
15
e-mail: [email protected]
Collection and storage of information
To store data, a non-volatile memory (Flash) chip is installed on the board, which stores the following
service and diagnostic information:
•
accumulated readings (number of pulses);
•
firmware version;
•
event log: history of SW and HW restarts,
S2
button clicks, information about faults at the inputs.
Algorithm of data logger connection
When setting up the schedule, the connection time is set in the "hh" format (
hh - hours, minutes are not
set
), however, if a large number of data loggers establish a connection at the same time, it may cause a
heavy load on the server. In order to reduce the load, each device connects to the server with a delay of
several minutes ahead of the specified hour. The delay has a fixed value, which is calculated based on
the IMEI number of the connected DTU and can range from 0
to 60 minutes (not more than 60 min).
SIM card operation
DTU4x0 has two SIM card slots with the ability to configure an active card and support for automatic
switching between cards if there is no connection on one of the cards. Setting the priority of SIM cards is
performed only via
DTU Configuration Tool
software when data logger is connected to a PC.
SIM operation modes
:
•
Auto
(default) – in this mode, DTU registers on SIM card, on which the connection was successfully
established earlier (when first turned on – on SIM1). If registration fails, data logger automatically
switch to another SIM and in case of successful connection remains on it.
•
SIM1/SIM2
– in this mode, a specific SIM card is selected as an active one. If the connection fails,
data logger will not switch to another SIM. The option
Enable SIM-card activity control
does not
work for this mode.
Operating in NB-IoT network
In order to connect to the NB-IoT network, you need to set a
PLMN (public land mobile network
) –
a
5-digit mobile network service area code which you can find out from your mobile provider. The PLMN
code can only be set via
DTU Configuration Tool
software, on the
System
tab, in the
Operator
line.
Backup battery power supply
DTU4x0
data loggers are powered from an external
7-30 VDC source.
DTU4x0-C
data loggers have a built-in PSU and operate from the 100-240 VAC mains.
Additionally, DTU4x0 have a built-in Li-SOCL2 3.6V battery,
which provides backup power supply and device operation
in an autonomous mode, when external power is
disconnected.
Backup battery is user replaceable.
Battery power is enabled by installing a special jumper
(included in the package
) on the
JP1
connector. When the
external power is turned off, data logger immediately
switches to battery power. When the external power is
restored, the battery power is turned off.
