ST HT22IoT User manual

EnvironmEntal paramEtErs
data loggEr
HT22IoT
usEr’s manual

HT2 IoT- 9 User’s Manual 2
1. Application ....................................................................................................................................... 4
2. What is included ............................................................................................................................... 5
3. asic requirements, operational safety ............................................................................................. 5
4. Fitting ............................................................................................................................................... 6
4.1. Installation ................................................................................................................................. 6
4.2. External connections diagram ................................................................................................... 6
5. Operation .......................................................................................................................................... 7
5.1. Messages after Switching the Supply on ................................................................................... 7
5.2. Functions of the button .............................................................................................................. 8
5.3. Connection of the device – configuration ................................................................................. 9
5.4. Functions of the monitor ......................................................................................................... 10
5.5. Description of HT20IoT monitor reading field ....................................................................... 10
5.6. Ethernet 10/100- ASE-T ........................................................................................................ 12
5.6.1. Connection of 10/100 ASE-T interface ......................................................................... 12
5.6.2. Ethernet interface default parameters ............................................................................... 14
5.6.2.1. Changing the parameters of Ethernet interface ......................................................... 14
5.6.3 Web Server ......................................................................................................................... 15
5.6.3.1 General view ............................................................................................................... 16
5.6.3.2. Selection of Web server user ..................................................................................... 18
5.6.3.3. Messages to the user .................................................................................................. 19
5.6.3.4. Access to the archive file through the web server ......................................................... 20
5.6.3.5 Logic alarms ................................................................................................................... 21
5.6.4 FTP Server ......................................................................................................................... 22
5.6.4.1 Selection of FTP user ...................................................................................................... 23
5.6.5 E-mail service ........................................................................................................................ 24
5.6.6 Modbus TCP/IP ..................................................................................................................... 26
5.6.6.1. Description of implemented functions .......................................................................... 27
5.6.6.2. Map of registers ............................................................................................................. 27
5.6.6.3. Read-only registers ........................................................................................................ 28
5.6.7 MQTT Protocol ..................................................................................................................... 29
5.7. Firmware upgrade .................................................................................................................... 31
5.8. Measured values archiving ...................................................................................................... 33
5.8.1. The monitor memory structure ......................................................................................... 33
5.8.2. Configuration of archiving ............................................................................................... 33
5.8.3. File system internal memory ............................................................................................ 34
5.8.4. Structure of archive files .................................................................................................. 35
6. Accessories ..................................................................................................................................... 36

HT2 IoT- 9 User’s Manual 3
7. Technical data ................................................................................................................................. 36
8. Ordering code ................................................................................................................................. 39

HT2 IoT- 9 User’s Manual 4
1. Application
HT2 IoT monitor is designed for continuous measurement and conversion of
relative humidity and ambient temperature into a digital form (prot. Modbus TCP/IP ,
HTTP). The monitor programming is possible with the built-in web server. The monitor has
an LCD display field with 2x16 characters. The device allows you to send e-mail messages
informing about the current environmental parameters as well as events that cause
exceeding the alarm values. The monitor is powered via Ethernet - PoE (Power Over
Ethernet) or standard DC jack.
Features of HT2 IoT monitor:
●measurement, display and archiving of ambient temperature, relative humidity, dew
point and absolute humidity,
●signaling of exceeding set alarm values
●programming logic alarm outputs with reaction to the selected input value.
●real-time clock function with clock supply support in case of the monitor power
failure
●registration of input signals in programmed time
●Ethernet 1 /1 BASE-T
◦protocol: Modbus TCP/IP, HTTP, FTP,
◦services: web server, ftp server, DHCP client, SMTP client,
Values measured and calculated by the monitor:
Temperature,
relative humidity,
dew point,
absolute humidity,
wet bulb temperature,
saturated vapor pressure,
enthalpy.
All quantities and configuration parameters are available through the embedded Web
server, if the parameter is not visible, set it in the tab Settings-> registers on the website.

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Fig. 1. View of HT20IoT monitor
2. What is included
●HT2 IoT monitor 1 pc.
●User’s manual 1 pc.
3. Basic requirements, operational safety
In terms of operational safety, the monitor meets the requirements of EN 61 1 -1.
Safety instructions
●The assembly and the installation of the electrical connections may be carried out
only by a duly qualified electrician.
●Before turning on the monitor verify the connections.
●The monitor is intended for installation and use in industrial electromagnetic
environments.
●A switch or a circuit-breaker should be installed in the building or facility. It should
be located near the device, easily accessible to the operator, and suitably marked.

HT2 IoT- 9 User’s Manual 6
4. Fitting
4.1. Installation
HT2 IoT monitor is mounted on a wall using a screw connection. The monitor
housing consists of an upper and a lower part.
Fig. 2 Location of mounting holes
4.2. External connections diagram
The monitor has 2 external slots:
- Ethernet port 1 /1 base-T
- DC power socket ɸ5.5 / 2.1 mm
and 1 button to reset the device to the standard parameters - "Reset"
Fig. 3. View of the upper part of HT20IoT monitor

HT2 IoT- 9 User’s Manual 7
5. peration
After wiring, mounting and powering the monitor is ready to work with factory
settings. The monitor can be programmed using the built-in web server.
The following parameters can be programmed in the monitor:
•Ethernet interface settings,
•Modbus settings,
•Archive settings,
•alarm settings,
•SMTP client settings - e-mail (only as unencrypted connection)
•system settings.
Cautio : Do not remove the cover of the sensor as this may damage the device!
5.1. Messages after Switching the Supply on
After power is turned on the display shows the device and the manufacturer’s name
and software version. After about 4s the serial number of the device is displayed and after
subsequent 4s the IP address in the network, if the device has been connected to Ethernet
network - the address can be static or obtained from DHCP server.

HT2 IoT- 9 User’s Manual 8
Fig. 4. Startup messages of HT20IoT monitor
5.2. Functions of the button
The device contains only one physical button for restoring the factory settings or
displaying the current IP address of the monitor. This button is located on the connector
panel – fig. 3.
- restoring factory parameters - after pressing and holding the button for 1 seconds;
Note: each successive restoring of factory parameters enables or disables the service of
obtaining network address from a DHCP server, i.e. if the DHCP service is enabled and
restoring the factory parameters will be forced , the DHCP service will be disabled (you will
be informed about the change by a message on the display) and default static IP address
will be assigned to the device: 192.168.1.19 (subnet mask: 255.255.255. ), another
request for restoring the factory parameters will enable the DHCP server service -
the network parameters will be obtained dynamically from the server;
- displaying the current IP address of the monitor – occurs after a short press
of the button – about 1 sec.
5.3. Connection of the device – configuration
5.3.1. onnection of the monitor to the network equipped with a DH P server

HT2 IoT- 9 User’s Manual 9
The easiest way to connect the HT2 IoT monitor Io the Ethernet network is to use
an existing DHCP server in the network, which assigns the communication parameters to
the devices connected, i.e. IP address, subnet mask, gateway, DNS address. In order to
use the automatic configuration with DHCP server, make sure the monitor is running with
DHCP client service enabled - - to do this, switch on the power of the monitor and observe
the initial messages:
a) message about the monitor operation with DHCP
client enabled – the displayed IP address is the current
address of the monitor acquired from DHCP server;
b) message about the work of the monitor with disabled
DHCP client service - the displayed IP address is the
current address of the monitor set manually or the default
address (after restoring the default parameters); in order
to obtain the address from the DHCP server, restore the monitor to the factory parameters,
point 5.2, and restart the device - then a) message should be displayed with the IP
address obtained from the DHCP server.
In order to further configure the device a computer (tablet, phone) must be
connected to the same Ethernet network (also with DHCP client enabled - automatic
acquisition of IP address), open a web browser and in the browser address field type the
IP address displayed by HT2 IoT. This will display the login screen to log the web server
that will allow further configuration - sign up to the administrator account, p. 5.6.3.2.
After gaining access to the full configuration we recommend that you disable the
DHCP client, leaving the acquired network parameters unchanged – IP address, subnet
mask, gateway, DNS address will be stored as static parameters.
5.3.2. onnecting the monitor to the network without using
DH P server
In order to use static configuration of network parameters, make sure the monitor is
running with the DHCP client service disabled - to do this switch on the power of the
monitor and observe the initial messages:
a) message about the monitor operation with DHCP client
service enabled – the displayed IP address is the current
address of the monitor acquired from DHCP server;
to set the a static IP address factory parameters should be
restored, p. 5.2, and the device should be restarted – then a message should be displayed
b) with the static default IP address.
) a message a out the monitor operation with disa led
DHCP client service - the displayed IP address is the current
address of the monitor set manually or the default IP

HT2 IoT- 9 User’s Manual 1
address (after restoring the default parameters), if the displayed address is different from
192.168.1.19 the factory defaults should e restored twice, p. 5.2;
In order to further configure the device a computer (tablet, phone) must be
connected to the same Ethernet network (or directly to the monitor) and the automatic
acquisition of network parameters must be disabled. Then, the static parameters
corresponding to the default network parameters of HT2 IoTmust be manually entered
into the computer (tablet, phone p. 5.6.2 (the same subnet mask and any IP address from
the pool 192.168.1.X except for the address 192.168.1.19 assigned by default
to HT2 IoT). After the connection, open your web browser and type in the address field of
the browser the default IP address 192.168.1.19. This will display the login screen to log
the web server that will allow further configuration - sign up to the administrator account, p.
5.6.3.2. After logging in to the monitor web server it is possible to change the network
parameters according to our needs - especially the IP address must be changed to make
sure that the monitor does not have the default IP address, otherwise the configuration of
other monitors working in the same Ethernet network will be difficult.
5.4. Functions of the onitor
Monitor HT2 IoT performs the following functions:
•measurement of the ambient temperature and relative humidity,
•calculation of selected physical quantities,
•memory of minimum and maximum values measured and calculated:
◦temperature,
◦relative humidity,
◦absolute humidity,
◦dew point.
5.5. Description of HT20IoT onitor reading field
The HT2 IoT monitor is equipped with a backlit LCD display consisting of two lines
of 16 characters each. The top line of the display is used for the presentation of measured
values - temperature and relative humidity
and to display status pictographs of the file system internal memory. The bottom line of
the display shows the internal memory usage, status of alarm 1, time and date. During
normal operation the monitor displays measured values alternately with their symbols.

HT2 IoT- 9 User’s Manual 11
Fig. Description of the HT20IoT monitor reading field
Table 1, 2 shows the symbols displayed on the LCD, and their meanings.
Table 1
Symbol Display mode Meaning
constant file system internal memory installed and ready
for operation
flashing error of file system internal memory
flashing file system internal memory full
flashing file system internal memory installed and ready
for operation, active FTP connection
constant Alarm activity indicator - alarms 1, 2 active
constant Alarm activity indicator - alarm 1 active
constant Alarm activity indicator - alarm 2 active
constant Alarm activity indicator - alarms inactive
Table 2

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Symbol
Percentage of internal
memory usage
87.5…1 %
75…87.5% 62.5…75% 5 …62.5% 37.5…5 % 25…37.5% 12.5…25%
…12.5%
Measuring ranges exceedings are indicated by displaying special characters on the top
line of the LCD:
●- lower exceeding of the range of the displayed value
●- upper exceeding of the range of the displayed value
5.6. Ethernet 10/100-BASE-T
HT2 IoT monitors are equipped with Ethernet interface for the connection (using
RJ45 slot) to a local or global network (LAN or WAN) and the use of network services
implemented in the monitors: Web server, FTP server, Modbus Slave TCP/IP, SMTP client.
In order to use the network services Ethernet parameters of the monitor must be
configured. Standard Ethernet parameters of the monitor are shown in table 4. The basic
parameter is the IP address of the monitor - by default 192.168.1.19, which must be
unique within the network to which we connect the device. The IP address can be
assigned to the monitor automatically by DHCP server present on the network provided
that the option to acquire IP address from DHCP servers is enabled in the monitor. DHCP
service is disabled by default, then the monitor initializes with the default IP address
allowing the user to change the IP address through the website.
Cautio : The monitor allows for up to 1 connections simultaneously!! The applications
implemented in the monitor use from 1 to 2 connections:
●Modbus TCP/IP - 1 connection
●Web server - minimum 1 connection
●FTP server - 2 connections
●SMTP client - 1 connection
5.6.1. Connection of 10/100 BASE-T interface
To access the Ethernet services, it is required to connect the monitor to the network
via the RJ45 slot located at the top of the monitor, operating in accordance with TCP/IP.
Fig. 6 View and numbering of RJ4 slot pins

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Description of the monitor RJ45 slot diodes function:
●yellow LED - illuminates when HT2 IoT is properly connected to the Ethernet
network
1 Base-T, does not light up when HT2 IoT is not connected to the network or is
connected to 1 -Base-T network.
●green LED - Tx/Rx flickers when the monitor sends and receives data, illuminates
constantly when data is transmitted
In order to connect HT2 to the network the User should use twisted pair cable.
●U/FTP – twisted pair cable with each pair foiled,
●F/FTP – twisted pair cable with each pair foiled, additionally cable with foil shield,
●S/FTP (formerly SFTP) – twisted pair cable with each pair foiled, additionally cable
with wire mesh shield,
●SF/FTP (formerly S-STP) – twisted pair cable with each pair foiled, additionally with
foil and wire mesh shield,
Categories of twisted pair cable according to the European standard EN 5 173
minimum: Class D (category 5) - for high-speed local area networks, includes applications
using the frequency band up to 1 MHz. The description of the connection is shown in
table 3. For Ethernet interface the User should use twisted pair cable of STP type
(shielded) category 5 with RJ-45 connector with conductors colors (in accordance with the
colors described in table 3) acc. to the following standard:
●EIA/TIA 568A for both connectors at the so-called simple connection of HT2 IoT to
the network hub or switch,
●EIA/TIA 568A for the first connector and EIA/TIA 568B for the second connector at
the so-called patch cord connection (crossover) used, among others, when
connecting HT2 IoT to a computer.

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Table 3
Conductor
no.
Signal Conductor color acc. to standard
EIA/TIA 568A EIA/TIA 568B
1 TX+ white-green white-orange
2 TX- green orange
3 RX+ white-orange white-green
4 EPWR+ blue blue
5 EPWR+ white-blue white-blue
6 RX- orange green
7 EPWR- white-brown white-brown
8 EPWR- brown brown
5.6.2. Ethernet interface default parameters
Table 4
No. Name Default value
1. DHCP Enabled or disabled
(cycled when default parameters restoration is forced)
2. IP Address 192.168.1.19
3. Subnet mask 255.255.255.
4. Default 192.168.1.1
5. DNS 8.8.8.8
5.6.2.1. hanging the parameters of Ethernet interface
Changing the parameters of the Ethernet interface is possible through the built-in
web server.

HT2 IoT- 9 User’s Manual 15
Fig. 7. View of the window to change the parameters of the Ethernet interface
5.6.3 Web Server
HT2 IoT monitor provides its own Web server that allows remote monitoring of
measured values and remote configuration and readout of the monitor status. With the
web page the user can:
●obtain device information (serial number, execution code, firmware version,
bootloader version, variant (standard or special),
●preview the current measured values,
●read the status of the device,
●select the language for the Web page,
●perform configuration
Access to the Web server is achieved by entering the monitor IP address in the web
browser, e.g .: http://192.168.1.19 (where 192.168.1.19 is the monitor address). The
standard port for web server is port "8 ". Server port may be changed by the user.
Cautio : For proper web page operation a browser with JavaScript enabled and
compatible with XHTML 1. is required (all popular browsers, Internet Explorer, version 8
minimum).

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5.6.3.1 General view
Fig. 8. General view of the main website
The function of each tile of the website:
1) The view of measurements and after clicking on the tile displaying graphs with
trends.
2) Ethernet interface settings.
3) Archive settings and information about memory usage and the process of data
dump to the file system memory.
4) Alarm settings and information about their status.
5) Information about the device, giving an individual name to the monitor.

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6) Setting the time, LCD display and configuration of our displayed values - the groups
of 12 values of any registers of the monitor registers to which we can assign our
own name and display them as a separate tile on the website. Defined records can
be archived and control the alarms.
7) Email configuration.
8) Logging off, return to the login page.
9) Configurable device name
1 ) Changing the language
11) Time to log off during inactivity
Fig. 9. View of the window to configure the group of our own registers

HT2 IoT- 9 User’s Manual 18
Fig. 10. View of a tile displaying a group of our 12 values
5.6.3.2. Selection of Web server user
The monitor has two user accounts for the Web server secured by individual
passwords:
●user: ”admi ”, password: ”admi ” - access to configuration and the preview of
parameters
●user: ”user”, password: ”pass” - access to the preview of parameters only.
●user: "guest" - access to the preview of the measured values on the home page
only, log on to the guest account does not require entering a user name or
password, it is enough to select "Login as a guest” and then click on "Login"
Fig. 11. View of the login window to the website
Calling the monitor IP address in the browser, for examplehttp://192.168.1.19 will
display the start window in the browser where the user must enter the name and
password. Additionally, you can log in to the "guest” account when you select “Login as a

HT2 IoT- 9 User’s Manual 19
guest” on the login page. "Guest” user account is limited
to view the measured values on the main page. Log off occurs after 5 minutes of inactivity.
5.6.3.3. Messages to the user
The web server is equipped with a system of messages to the user. If the user tries
to save the settings into the monitor, a message is returned on the status of such
operation. For mobile applications there is a user notification system built-in the web
browser.
Fig. 12. View of the message window informing that parameters has been
correctly recorded in the device
Fig. 13. View of the message window informing about incorrect data
of the web form
Fig. 14. View of the message window informing about lack of permission
to view the website content.

HT2 IoT- 9 User’s Manual 2
5.6.3.4. Access to the archive file through the web server
HT2 IoT allows for access to archive files through the file manager implemented on
the web server that allows the user to retrieve and delete individual files. To start the
archive file manager, click on the tile Archive, and then click the button Browse arch.
Files.
Fig. 1 . View of the window of the file manager on the web server
In order to download the file, click the file icon, and to delete a file, click the trash
can symbol next to the file icon.
5.6.3.5 Logic alarms
HT2 IoT is equipped with 2 logic alarm outputs. Each alarm can operate in one of
six modes. Fig. 17 shows the operation of alarm in the following modes: n-on, n-off, on,
off. The other two modes: h-on and h-off mean respectively, always On and always Off.
These modes are designed for manual simulation of alarm states.