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DTU2xx Data Logger Series 

User Guide. r. 2.1 | 2021-11-10 

 

 

Tel.:  +420 538 890 720 

13 

    e-mail: [email protected] 

 

The sensor is powered from an external power supply source. Such a scheme is used if the 
supply voltage at the DTU outputs (

7.5V

 and 

12V

) does not correspond to the voltage that 

must be supplied to the sensor. 

In this case, the sensor is connected according to the diagram below. 4-20mA output is 
connected to any of the inputs 

IO1-IO4

 of the DTU, the 

+Upow

 contact of the sensor is 

connected to the 

+Upow

 of the power supply, and the 

–Upow

 of the PSU is connected 

to any contact 

G

 of the data logger.  

RS-232 and RS-485 Interfaces 

RS-232 and RS-485 interfaces are designed for remote data collection 
from  devices.  DTU  allows  organizing  a  transparent  communication 
channel between serial devices and upper-level software even in cases 
where there is no external power supply at the facility, since the device 
can operate autonomously, from a 3500 mAh battery. 
The  interfaces  are  co-located,  so  all  information  received  over  a 
transparent TCP channel goes to both serial ports, and the response 
received  over  any  of  the  interfaces  is  transmitted  into  a  single 
transparent TCP channel. At one point in time, data exchange is possible 
between one of the interfaces ("Client") and a remote node ("Server"). 

The RS-232 interface

 uses three signals

: Rx, Tx, G

. 

The RS-485 interface supports 

A (+)

 and 

B (-)

 signals, and also has a 

built-in 120Ω 

(T)

 terminal resistor output that is connected to the line 

when shorted to 

B (-).

 

The load capacity of the RS-485 interface allows you to simultaneously connect: 

 

up to 32 devices with a single load (1UL); 

 

up to 64 devices with 1/2-unit load (1 / 2UL); 

 

up to 128 devices with 1/4-unit load (1 / 4UL); 

 

up to 256 devices with 1/8-unit load (1 / 8UL). 

Fig. 9. Connecting the current sensor to the DTU

 

(powered by an external power supply unit).

 

Fig. 10. RS-232 and RS-485 ports.

 

Summary of Contents for DTU2 Series

Page 1: ...GPRS NB IoT Data Loggers DTU2xx User Guide Revision 2 1 November 2021...

Page 2: ...ct may cause radio interference In such cases users may be required to take adequate measures WARNINGS Do not dispose electronic equipment as unsorted municipal waste Please use a separate collection...

Page 3: ...gorithm of data logger communication 17 SIM card operation 17 Operating in NB IoT network 17 Backup battery power supply 18 2 Getting Started 19 Important safety information 19 Installing DTU data log...

Page 4: ...n of the data logger in the event of external power failure Battery service life ranges from 4 to 10 years depending on the model GPRS or NB IoT and its use The model range of DTU2xx is represented by...

Page 5: ...ounting Example of a modification name DTU227 UCG ZR Within each group of options the letters go alphabetically If the letters of the option group are not present in the modification name then the let...

Page 6: ...NB IoT Cat NB2 Data transmission rate up to 85 6 kbps DL UL 125 kbps DL 150 kbps UL Protocol Stacks IPv4 TCP IPv4 TCP IPv4 UDP IPv4 TCP IPv4 UDP GPIO PARAMETERS Universal pulse inputs x4 IO1 IO4 Conne...

Page 7: ...V DISABLED by default Enabled when the Current loop input is activated SIM 2 x mini SIM 2FF Antenna 1 x SMA F connector DEFAULT SETTINGS Data slice saving once per hour Readings transfer to server onc...

Page 8: ...for connecting to the server configuring data logger 4 1 SIM 1 SIM card 1 holder 4 2 Button to remove SIM card 1 5 1 SIM 2 SIM card 2 holder 5 2 Button to remove SIM card 2 6 ANT SMA F connector for...

Page 9: ...OUT G Ground 3 6V 3 6 V power output 3 6V 3 6 V power output 12 XP58 connector 5V 5 V power output 7 5V 7 5 V power output 12V 12 V power output 13 1 XP69 connector 7 30 VDC DTU217 DTU227 G Ground V...

Page 10: ...when connecting high frequency impulse meters to the data logger Connection An example of a possible connection of meters to the data logger is given in figure below One wire of the meter is connecte...

Page 11: ...ger Connection The sensor has a two wire connection scheme one wire is connected to any of the IO1 IO4 contacts and the other to the 3 6V contact Connection polarity is not important The plate is plac...

Page 12: ...nsor receives power from the data line in parasitic mode Current Sensor 4 20 ma the type of input used when connecting 4 20mA current sensors to the data logger When this type is selected a 100 Ohm lo...

Page 13: ...s where there is no external power supply at the facility since the device can operate autonomously from a 3500 mAh battery The interfaces are co located so all information received over a transparent...

Page 14: ...the two channel mode On the one hand the data transfer channel from the GPIO ports via the ADGT DTU protocol is kept active and at the same time a separate transparent communication channel between RS...

Page 15: ...nt mode and independently establishes an outgoing connection with the Server to which it sends data after the connection The default Server is the online dispatching server https iot24 eu The server i...

Page 16: ...Condition Description External power connection ST1 reading is ON External power supply 12V or 230V connected ST1 reading is OFF External power is not connected Switching the device to configuration c...

Page 17: ...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 but not more than 60 min SIM card o...

Page 18: ...n power supply unit depending on the model see Product Description Therefore the devices can be powered both from an external 7 30 VDC source and from the 100 240 VAC network through a two contact ter...

Page 19: ...device does not have its own power switch and can be installed into hard to reach places electrical cabinets etc for safety reasons equip the device with an external power off switch The switch should...

Page 20: ...or LTE NB IoT SMA m antenna to the ANT SMA f connector 4 Connect meters and sensors to the corresponding DTU GPIO connectors IO1 IO4 For pinouts see section Appearance Recommended wiring diagrams are...

Page 21: ...Please observe the correct polarity G Ground negative input V 7 30 VDC positive input The maximum operating voltage input must not exceed 30V DC Reverse polarity will not cause damage but the data lo...

Page 22: ...te after connecting the power this time is required to configure the inputs and establish a connection press the SB button to transmit the readings to https iot24 eu server Remember or write down the...

Page 23: ...ion for Windows 32 bit 64 bit and Linux 64 bit versions at https adgt cz ATTENTION The DTU Configuration Tool program is written in Java therefore to start it you need to have Java Runtime Environment...

Page 24: ...ade The button should be pressed after each change of the parameters Service functions Button opens the window where it is possible to update the firmware version reboot the device reset the DTU confi...

Page 25: ...eration time time period of the device power supply operation starting from the device switch on and to the current moment The parameter is non resettable GSM connection GSM module status Enabled Disa...

Page 26: ...ansmission Disables data transmission initiated by the Data Logger The data archive is transmitted only on request from the server Sporadic data transmission enabled Enabled Disabled Inputs trigger le...

Page 27: ...operator Not set 1 31 characters GPRS password APN GPRS access point Specified by the network operator Not set 1 31 characters Enable SIM card activity control The option works only if in the Active...

Page 28: ...the parameters do not forget to click the Write settings button Unsaved changes will be highlighted in yellow Configuring Inputs Each input parameters configuration could be performed at the Inputs t...

Page 29: ...from the measur ing device non setting parameter Read from the meter Closed Opened Open short circuit Emergency discharge value Maximum pulse repetition rate at the input for 10 minutes When the pre e...

Page 30: ...Parameter Description Default Value options Serial port parameters Serial baudrate Serial port speed of the connected meter 19200 bit s from 600 to 115200 bits c Parity and length Parity check mode a...

Page 31: ...cond Allowable channel silence The parameter is only active when the device is powered by an ER18505 battery If there is silence in the channel during data transfer data is no longer transmitted the d...

Page 32: ...y of a few minutes in advance from the specified hour DTU supports three types of schedule daily weekly and monthly The schedule configuration is performed at the Schedule tab using the following algo...

Page 33: ...ters should be additionally set in case of possible connection problems Repeat if transmission failed the maximum number of attempts to transmit data on the day of the DTU connection to the Cloud Serv...

Page 34: ...o read and to send meter readings SMS for example to the housing and utility services or to the management company The parameter is directly connected with the Number of days for repeated transmission...

Page 35: ...To do this check the box in the appropriate field 2 If any of the data logger inputs operates in the Current loop mode and power is supplied to it from the 7 5V and 12V data logger outputs you need t...

Page 36: ...of the week Days of week day of the month Day of month or the time period Period in which the device should communicate d In the Transmission hour line specify the time of communication on the specifi...

Page 37: ...ut two minutes after that the device stays in the active mode for 15 minutes more and then passes to the sleep mode DTU Data Logger reset back to default settings is executed using the DTU Configurati...

Page 38: ...DTU2xx Data Logger Series User Guide r 2 1 2021 11 10 Tel 420 538 890 720 38 e mail info adgt cz Fig 33 Updating the firmware of the DTU2xx data logger...

Page 39: ...11 10 Tel 420 538 890 720 39 e mail info adgt cz Application 1 When using a DTU2xx C data logger with 230 VAC power supply for double protection against electric shock use the diagram below Fig 34 Do...

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