ЕТ- 485
NOVATEK-ELECTRO LTD.
Intelligent Industrial Electronics
Protocol converter
Modbus RTU/ASCII (RS-485) to
Modbus TCP (Ethernet)
ЕТ- 485
USER MANUAL
TECHNICAL DATA SHEET
www.novatek-electro.in
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CAUTIONS

Carefully study the user manual before using the appliance.

Place the unit under operating conditions and wait at least 2 hours before connecting it to the electricity
mains.

Do not use abrasives or organic compounds (alcohol, gasoline, solvents, etc.) for cleaning.
DO NOT OPEN AND REPAIR THE EQUIPMENT YOURSELF.
It may contain energized parts.
DO NOT OPERATE THIS UNIT IN CASE OF ANY MECHANICAL DAMAGE TO THE CASING.
DO NOT EXPOSE THIS PRODUCT TO WATER OR OPERATE IN A HIGH HUMIDITY ENVIRONMENT.
This is a safe in service unit if complying with operating procedures.
ET-485 NOVATEK-ELECTRO
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CONTENT
1. Purpose
2. Specifications
2.1. Main specifications
2.2. Operating conditions
3. Structure and Functioning
3.1. Structure
3.1.1. Design
3.1.2. Display and control
3.2. Functioning
4. Maintenance and safety measures
4.1. Safety measures
4.2. Maintenance procedure for ЕТ-485
5. Connecting the ЕТ-485
6. Operating the ЕТ-485
6.1. General information
6.2. Operating ЕТ-485 over the HTTP protocol
6.3. Operating ЕТ-485 over the Modbus TCP protocol
7. Settings
7.1. General information
7.2. Parameters of ЕТ-485
7.3. Configuring ЕТ-485 through WEB interface
7.4. Configuring ЕТ-485 through Modbus interface
8. Complete set
9. Service life and warranty
10. Transportation and storage
11. Acceptance certificate
12. Data on claims
Appendix A. Switching to Ethernet
Appendix B. Character codes under ASCII standard
5
6
6
7
8
8
8
9
9
11
11
11
12
13
13
13
13
14
14
15
27
28
28
29
30
30
31
32
38
NOVATEK-ELECTRO ET-485
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Terms and abbreviations
10Base-T – Ethernet standard for twisted pair communication with the speed of 10Mbit/s;
100Base-T – Ethernet standard for twisted pair communication with the speed of 100Mbit/s;
8P8C/RJ45 – is an unified socket for 10Base-T / 100Base-T network connections;
Twisted pair – is a pair of insulated conductors inside the cable, which are twisted together in order to reduce the distortion of the transmitted
signal;
Indicator – is a LED element;
Client – is a device, which is addressing the other devices (server) with a request to perform certain functions;
Package – is a block of data to be transmitted between devices;
Unit – is the ЕТ-485 Protocol converter;
Server – is a unit, which performs specific functions at the request of other units;
ASCII – is a table of standard codes for information interchange;
Ethernet – is a standard for packet network communication and transmitting data between units (e.g., PCs);
HTTP – is a protocol for transferring Web-pages and other data over "client-server " technology;
Internet – is a global routing system of units for storing and transferring data;
IP (protocol) – is a routable protocol for transferring data over Ethernet. It is a part of TCP/IP and used for Internet;
IP (address) – is a node address, which is unique within a single network, operating over the IP protocol;
IPv4 – is a four byte IP-address;
MAC (address) – is an address, used for device authentication during Ethernet transmissions. It is usually unique although qualified personnel can
change it under certain circumstances.
MAC-48 – is a six byte MAC-address;
Modbus – is a standard and protocol for packet communication over the "client-server " technology for industrial electronic units;
Modbus RTU – is a communication protocol of the unit for bite wise transfer of the package;
Modbus ASCII – is a communication protocol of the unit for the transfer of package in the form of ASCII-symbols;
Modbus TCP – is a protocol for transferring Modbus packages under the TCP/IP standard;
RS-485/EIA-485 – is a network standard for communicating units over the twisted pair;
TCP/IP – is a standard and a set of protocols for transferring data along the networks with delivery verification;
WEB – is a system for accessing documents on the server, used in the Internet.
WEB-page – is a document, file, recourse, which is available on the Web-server;
WEB-browser – is a WEB-server client for accessing the WEB-pages, which is primarily using the HTTP protocol.
ET-485 NOVATEK-ELECTRO
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1
PURPOSE
ЕТ-485 is a microprocessor unit.
It is designed to exchange data over the Ethernet
10BASE-T and 100BASE-T network using the equipment,
which is provided with the RS-485 interface and establishing
a Modbus network. The standard network mapping using the
ЕТ-485 is provided in Fig.1.
The unit fulfills the functions of a Modbus-server for
switching the Modbus-clients to the Ethernet network. It
redirects the Modbus-requests from the clients to the units in
the Modbus network and returns their answers to the clients.
ЕТ-485 has:

flexible addressing within the Ethernet network
(overloading MAC-address, static and dynamic IP-address);

access protection over the Ethernet network
(password for configuration mode, IP-address filter for setting
and switching to the Modbus network);

different data transfer modes for Modbus network
(RTU and ASCII with/without odd-even check, wide range of
transmission speeds, selectable delay).
Figure 1 – Network mapping with the unit
NOVATEK-ELECTRO ET-485
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2. SPECIFICATIONS
2.1 Main specifications
Main specifications are resulted in Table 1.
Table 1 – Main specifications of the unit
Operating supply voltage, VAC
Voltage to maintain normal operation, V
- alternating current
- direct current
Supply frequency, Hz
Data Exchange Interface over the Ethernet network
Supported Ethernet protocols
Maximum number of connections over the Modbus TCP protocol
Integrated servers
Data Exchange Interface over the Modbus network
Supported Modbus protocols
Maximum number of connected units within the Modbus network
LED
Readiness time upon switching the unit to the mains, sec, no more than
Utilized current (in case of 220 V), mA, at most
Weight, kg, at most
Dimensions, mm
Unit purpose
Nominal operation condition
ET-485 NOVATEK-ELECTRO
220
100 – 250
140 – 350
47 – 63
10BASE-T/100BASE-T (twisted pair)
Modbus TCP, HTTP
11
Modbus-server,
HTTP-server
RS-485
Modbus RTU,
Modbus ASCII
32
_
1
10
0.200
95 х 52 х 67
Communication equipment
continuous
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Terminal bus specifications
- cross-section of switched conductors, mm2
- maximum effort (torque) on screw terminals, Nm
Level of protection:
- unit
- terminal bus
Protection class against electrical shock
Climatic version
Permissible pollution density
Overvoltage category
Rated insulation voltage, V
Rated impulse withstand voltage, kV
Operating position
Pollutants in the amount,
which is not to exceed the maximum permissible concentration
0.3 – 3
0.4
ІР30
IP20
II
УХЛ3.1
II
II
450
2.5
arbitrary
none
2.2 Operating conditions
This unit is designed to operate (or to be stored) under conditions resulted in Table 2.
Table 2 – Operating and storage conditions
Operating temperature, °С
Storage temperature, °С
Atmospheric pressure, kPa
Relative air humidity (at 25°С), %
from minus 35 to +55
from minus 45 to +70
from 84 to 106.7
from 30 to 80
NOVATEK-ELECTRO ET-485
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3. STRUCTURE AND FUNCTIONING
3.1. Structure
3.1.1. Design
The unit has a standard plastic case,
which can be attached to the DIN-rails with the
width of 35 mm. The unit drawing, together with
the overall and setting dimensions, is provided
in Figure 2.
Figure 2 – Overall dimensions of the unit
ET-485 NOVATEK-ELECTRO
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3.1.2. Display and control
The front panel of ЕТ-485 is provided in Figure 3.
1 – Reset button "R" is designed to restart the unit or factory reset.
2 – Power indicator «Power» is activated if supply voltage is available.
3 – Error indicator «Error» warns about errors (to include format errors of incoming
data packages).
4 – Indicator «RS-485» is activated while waiting a reply from the unit in the
Modbus network; is flashing while data exchange over the Modbus network.
5 – Indicator «Ethernet» is activated when connected to the Ethernet network; is
flashing while data exchange over the Ethernet network.
Figure 3 – Front panel of ET-485
3.2. Functioning
Simplified structural diagram of the unit is provided in Figure 4.
32-digit RISC-processor with ARM architecture provides data routing between the Modbus RTU/ASCII (RS-485)
network and Ethernet (10base-T/100base-T) network. The operating speed and availability of channels for direct access to the
memory allows to process the high-speed data flow. Indicators provide information on the connection status and data transfer
over the Modbus and Ethernet networks. The "Reset" button allows of restart the unit, without switching it off the mains, or do a
factory reset:

to do a factory reset – press and hold down the reset button "R" for 8 seconds; "Error" indicator shall be activated in 2
seconds; the unit shall be restarted and the indicator "RS-485" shall be activated and deactivated after 8 seconds of
holding down the button; release the "R" button;

to reset the unit while saving user configurations – press and hold down the reset button "R"; release the "R" button
when "Error" indicator shall become activated.
Note – when restarting the unit, the clients may need to renew the connections.
NOVATEK-ELECTRO ET-485
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The unit has a memory to save settings. Every unit is provided with a globally unique MAC-address (during the
production) and can be connected to local networks with a protected access to Internet.
Control panel
DC power
LED module
(unit status
indication)
Reset button
Processor ARM cortex
m3
Figure 4 – Structural diagram of the unit
ET-485 NOVATEK-ELECTRO
~ 11 ~
4 MAINTENANCE AND SAFETY MEASURES
4.1
Safety measures
4.1.1 ЕТ-485 IS OPERATING A POTENTIALLY LETHAL VOLTAGE; Power off the unit, as well as any
other units connected to it, before maintenance, trouble-shooting or installation works.
4.1.2 The unit is not designed for operation under impact or vibration conditions.
4.1.3 Do not expose the inner electric components of the unit, as well as input contacts of terminal blocks and sockets,
to water.
4.1.4 Do not operate the unit in aggressive environment with the presence of acids, alkalies, oils, etc. in the air.
4.1.5 Switching, adjustment and maintenance of the unit should be conducted by the qualified personnel, who is familiar
with the provisions of this user manual.
4.2.6 The following regulations should be enforced while operating and maintaining the unit: GOST 12.3.019-80,
"Operational regulations of Electrical Installations", and "Safety Regulations for the Operation of Electrical
Installations".
4.2 Maintenance procedure for ЕТ-485
Suggested maintenance interval – every six month.
The maintenance procedure includes visual inspection to verify the connection of cables to the ЕТ-485 terminals, as
well as the absence of fractures and cracks on the case.
All safety regulations provided under section 4.1 should be enforced during the maintenance.
5 SWITCHING OF ЕТ-485
NOVATEK-ELECTRO ET-485
~ 12 ~
The unit is switched according to the diagram, see Fig. 5.
1)
Switch the cable connection with Modbus network (twisted
pair cable of Cat.1 or higher) to the "RS- 485" socket and
Modbus network (or directly to the unit with RS-485
interface).
Note: Contact “A” is designed for transferring noninverted signal, while contact “B” is used for the
inverted signal.
2)
Switch the cable connection with Ethernet network
(supplied) to the “Ethernet” socket and Ethernet network.
Any connection peculiarities depending on the type of
network are resulted in Appendix A.
3)
Switch the power cable connection (copper stranded
2
conductor cable with the cross-section of 0.75 mm and
maximum operating voltage of no less than 380V) to
“220V” socket, and then connect the cable to the power
supply 220V, 50 Hz.
Figure 5 – Unit connection diagram
ET-485 NOVATEK-ELECTRO
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6. OPERATING ЕТ-485
6.1. General information
Powering up the unit will activate "Error" and "RS-485" indicators, while the unit shall start initiating transceivers. Both
indicators become deactivated in 0.5 seconds and the unit proceeds to perform the server functions (Ethernet network
connection may take more time depending on the settings of the unit as well as other units connected to the network).
WARNING! CONTINUOUS ACTIVATION OR FLASHING OF “ERROR” INDICATOR IN THE ABSENCE OF
CONNECTIONS TO THE UNIT INDICATES UNIT MALFUNCTION.
Ethernet network connection pending. The network connection is established, if “Ethernet” indicator becomes activated.
Flashing of “Ethernet” indicator stands for transmitting data over the network.
6.2. Operating ЕТ-485 over the HTTP protocol
ET-485 waits for a connection to an Ethernet network using the HTTP protocol on port 80. PC connection can be
established using the WEB-browser.
When a client connects to port 80, the unit starts expecting requests for HTML-pages. These requests may contain
certain parameters. In case of a valid request, those parameters are processed and the client receives the text of a selected
HTML-page. In case of a request without an indication of certain page, the client is returned to the title page. When the page is
transferred, the unit deactivates the client and awaits for further connection.
6.3. Operating ЕТ-485 over the Modbus TCP protocol
While operating, the ET-485 waits for a connection to an Ethernet network using the Modbus TCP protocol on port 502.
The connection port for Modbus TCP can be changed by the user. PC connection can be established using any software –
Modbus TCP of the clients. Client software for ОС Windows can be downloaded from the manufacturer's web-site
(http://novatek-electro.com/programmnoe_obespechenie.html).
NOVATEK-ELECTRO ET-485
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When a request for client connection to the Modbus TCP port is received, the unit starts verifying the client's IP-address
(if connection filtering over IP is activated). If this address does not correspond with the preset value, the connection is
rejected. Otherwise, the unit starts checking the list of available connections. In case of no available connections, the unit
(depending on the configuration) can connect a new client instead of the previously connected one (if no activity of the client
was registered over a set period of time, or if the connection is maintained longer than prescribed).
When a client is connected to a Modbus TCP port, the unit adds it to the internal list of clients (the number of clients
cannot be greater than provided under specifications). In case of any request from the client, if the request is addressed to ET485, the unit processes it and provides a response to the client. If the request is addressed to another unit, the unit sends the
request into the Modbus network and waits for a response from a unit on the network (“RS-485” indicator is activated in this
case). “RS-485” indicator is deactivated if the data is received or the waiting time is out. If the response is provided in a proper
format, ЕТ-485 transmits it to the client that requested it. In case of any format errors, an “Error” indicator shall become
activated for 0.5 seconds and no response is provided to the client. If no response is provided, ET-485 generates and
transmits the proper Modbus exemption code to the client (code 11).
7. SETTING
7.1 General information
Configurable parameters are described in section 7.2. All parameters are saved at the power off.
Unit configuration can be done in two ways:

through WEB-interface, see Section 7.3;

through Modbus-interface, see Section 7.4;
WARNING! ANY CHANGES IN UNIT CONFIGURATION MAY RESULT IN BLOCKING OR OBSTRUCTION WHILE
TRYING TO REACH THE UNIT OVER THE NETWORK.
In this case, all parameters should be factory reset (see Section 3.2).
ET-485 NOVATEK-ELECTRO
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7.2 Parameters of ЕТ-485
A collection of parameters available via Modbus protocol is provided in Table 3 . The inner structure of any collection of
parameters is similar to the structure of collection, which is described in table 7 (apart from start-address).
The presentation format of parameters in Modbus registers is detailed in Table 4.
All parameters to control the current operating mode of the unit (available for read and write) are provided in Table 5.
All parameters to determine the current condition of the unit (available for read-only) are provided in Table 6.
All parameters available in the configuration mode only are provided in Table 7.
Table 3 – Collection of parameters available via Modbus protocol
Collection
Description
Access
Acting settings
Current unit configuration
Saved
settings
Factory
settings
Changeable
settings
The collection is saved regardless of power supply and
further used as the restart.
Fixed collection, which can be activated as shown in
sections 7.3 and 7.4
All parameters in Table 7, which can be modified and
incorporated as described in Section 7.4
Address
In any mode,
read-only
In configuration mode only,
read-only
In configuration mode only,
read-only
In configuration mode only,
reading and writing
200-262
300-362
400-462
500-562
Table 4 – Presentation format of parameters in Modbus registers
Parameter
Range of values
Number
0-65535
Number
0-4294967295 in two registers,
upper part – first
Description
Number of Registers
Integer (16 bits) in a standard range of Modbus
register
Integer number, which can not exceed the limit
for Modbus register (65535)
Set of values, each of which is equal to code 1 of
1
NOVATEK-ELECTRO ET-485
2
~ 16 ~
Character
string
In every register – ASCII character
code or 0 (end of string)
the ASCII character (see Appendix B) If the
string is shorter than maximum length, last
character is followed by the code 0.
A set of four byte IPv4 address, from left to right
IP-address In every register – one byte (0-255)
(IP-mask)
MACIn every register – one byte (0-255)
A set of six byte MAC-48 address, from left to
address
right
Table 5 – Parameters to control the current operating mode of the unit
Parameter
Min – Max
Initial value
Entering
password
String of characters
0
0-3,
writing in the
configuration
mode
Control
command
0
Maximum length
of the string for the
given parameter
4
Description
6
Address
Configuration mode is available upon entering the valid 100-119
password
0: no activity
1: «Restart» – unit restart
120
2: «Save» – save the changed settings on the Modbus
3: «Factory reset» – reset the unit to factory settings
Table 6 – Parameters to determine the current condition of the unit
Parameter
Mode
Current IP-address
Current MAC-address
Number of Modbus TCP clients
Maximum number of Modbus TCP
clients
Time, min
ET-485 NOVATEK-ELECTRO
Description
Address
0: User mode
1: Configuration mode
IP-address of the unit in Ethernet network
MAC-address to authenticate the unit in Ethernet network
Number of connections provided over the Modbus TCP protocol
Total number of possible connections to Modbus TCP
121
122-125
126-131
132
133
Number of minutes since the start
134-135
~ 17 ~
Parameter
Description
Address
Modbus TCP loading, requests/sec
Number of Ethernet network
congestions
Number of communication errors
Number of requests processed in a second
Number of incoming buffer overflows for Ethernet (which may result
in a data loss) – since the start
Number of identified errors (connection/communication) after which
the work was continued, - since the start
Number of preset restarts – during the whole period of operation
136
137
Number of identified errors (failures) resulting in a restart of the unit during the whole period of operation
140
Number of periodic restarts
Number of critical errors
138
139
Table 7 – Unit configuration settings
Parameter
Min – Max
Factory setting
Description
Address
Addressing in the Ethernet network
Static IP-address
Subnet mask
Gateway
Enable dynamic
addressing via
DHCP-server
IP192.168.0.111
address
IP-mask 255.255.255.0
IP-address 192.168.0.1
0-1
0
IP-address of the unit in Ethernet network shall be equal to this 500–503
value if dynamic addressing is disabled or not available.
Used only together with a static IP-address
504-507
Used only together with a static IP-address, or as an IP-address
filter for DHCP-server
508-511
0: preset IP-address, mask and gateway is used for addressing
in Ethernet.
512
1: DHCP network server is used by the unit to determine IPaddress, mask and gateway. The parameters for static
addressing are used if server is unavailable
NOVATEK-ELECTRO ET-485
~ 18 ~
Parameter
Enable IPaddress filter of
the DHCP server
Enable manually
set MAC-address
Min – Max
Factory setting
0-1
0
0-1
0
manually set
MACUnique for
MAC-address
address
every unit
Switching to Ethernet network
Connection port for 1-65535
Modbus TCP
IP-address of the
primary client
IP-address
Enable the IPconnections
0-1
filter for
configuration
Enable the IPconnections
0-1
filter over
Modbus TCP
ET-485 NOVATEK-ELECTRO
502
192.168.0.2
0
0
Description
Used if dynamic addressing is enabled.
0: unit receives addressing data from the first DHCP-server to
respond
1: unit receives addressing data only from DHCP-server with IPaddress of the gateway
0: unique value for every unit, stored in the memory shall be
used as a MAC-address
1: manually set value is used for MAC-address
Used if manually set MAC-address is enabled for the
authentication of unit in the Ethernet network
Used in case of TCP-connection to the unit via Ethernet to
exchange data over Modbus TCP protocol
IP-address, for which one connection via Modbus TCP is
reserved. Address, which is used for unit configuration.
0: setting parameters via Modbus-interface or WEB-interface
from any address (password protected)
1: setting parameters via Modbus-interface or WEB-interface
is only allowed from the IP-address of the main client
0: Modbus TCP connections are available from any address
1: any Modbus TCP connections are available only from the
IP-address of the main client
Address
513
514
515-520
521
522-525
526
527
~ 19 ~
Parameter
Enable
replacement of
non-active
clients
Maximum query
timeout, sec
Enable the queue
for the last busy
Modbus TCP
connection
Min – Max
0-1
0-9999
0-1
The maximum hold
time of the last
0-600,000
connection to
Modbus TCP,
msec
Modbus network
Own Modbusidentifier of the unit
0-247
Factory setting
1
Description
0: Modbus TCP connection is maintained regardless of the
time period between requests from the client
1: if all connections to Modbus TCP are busy, the new client,
requesting for a connection, can be connected instead of the
client, who provided no requests over the longer then preset
period
Used, if replacement of non-active clients is enabled
90
0
60,000
111
Address
528
529
0: Modbus TCP connection is maintained regardless of the
connection hold time
1: if all connections to Modbus TCP are busy, the new client,
requesting for a connection, can be connected instead of the last
connected client, if the hold time is more than a preset time
530
Used, if the queue is enabled for the last connection to Modbus 531–532
TCP
0: unit forwards all Modbus TCP requests into the Modbus
network, unit registers via Modbus TCP are unavailable
1–247: units responds to Modbus TCP requests bearing the
given Modbus-identifier without forwarding them to the Modbus
network
NOVATEK-ELECTRO ET-485
533
~ 20 ~
Parameter
Bit rate in Modbusnetwork, bit/sec
Enable the oddeven check
Enable the oddeven check
(to verify odds)
Min – Max
75 –
1,500,000
9,600
0-1
0
0-1
0
Response time
0-60,000
from Modbus RTU,
msec
ET-485 NOVATEK-ELECTRO
Factory setting
200
Description
Address
Used in case of data exchange between the units in Modbusnetwork, the same value for all units in Modbus-network
534-535
Used in case of data exchange between the units in Modbusnetwork, the same value for all units in Modbus-network
0: unused, byte is completed with 2 stop bits
1: byte is completed with parity bit and 1 stop bit
Used in case of data exchange between the units in Modbusnetwork, if odd-even check is enabled. The same value for all
units in Modbus-network
0: Parity check
1: Imparity check
Used in case of data transfer via the Modbus-network in RTU
mode. Waiting for a response is terminated if the first byte of the
response has not been received within the given time after
sending the request. The response is always expected longer
then time of silence between frames (time of silence depends
on the bit rate and shall be equal to the time required for
transmitting 3.5 bytes, or 1.75 msec for bit rate over 19,200
bits/sec).
536
537
538
~ 21 ~
Parameter
Enable ASCII
exchange in
Modbus network
Response time for
subsequent
Modbus ASCII
character, msec
Min – Max
Factory setting
0-1
0
0-60,000
1000
0–1
5-7200
0
7200
Description
Exchange mode in Modbus-network, the same value for all
units in Modbus-network
0: RTU exchange mode (format: 1start bit, 8 data bits, 1 parity
bit or stop-bit or 1 stop bit – total 11 bits).
1: ASCII exchange mode (format: 1start bit, 7 data bits, 1 parity
bit or stop-bit or 1 stop bit – total 10 bits).
Used in case of data transfer via the Modbus-network in ASCII
mode. Waiting for a response is terminated if the subsequent
byte of the response has not been received within the given
time, as indicated for the reception of response. Waiting time
shall not be less then time required for transmission of a single
character (depending on the bit rate).
Address
539
540
Miscellaneous
Enable periodic
restart of the unit
Unit restart
interval, min
Password to enter String of
the setup mode
characters
11111
0: periodic restart disabled
1: unit restarts at a specified interval of time
Used if periodic restart of the unit is enabled
Used to access the setup mode for Modbus TCP. Any string of
5 to 20 characters can be used as a password. It may not
contain spaces or special characters listed in quotes below:
«; : " < > * + = \ | / ? ,»
NOVATEK-ELECTRO ET-485
541
542
543-562
~ 22 ~
7.3 Configuring ЕТ-485 through WEB interface
WEB-browser is used for setting via WEB-interface.
Write the unit IP-address in your browser (factory setting - 192.168.0.111) and proceed to the specified address.
Note: If the browser is set to use the proxy server, the access to the unit over local network shall be granted
only after adding the IP- address into the exceptions list as indicated in the browser documentation.
This will open home page with tabs for transferring into the other modes.
Select “Settings” to start the configuration of unit Ethernet network.
Password request shall appear before granting access to setup mode (factory setting 11111).
Enter password and press "Enter". If the password is correct, you shall be granted access to the setup mode. Settings
page appears with a list of parameters detailed in Table 7. If the password is incorrect, the password request shall be
displayed once again.
Click "Save" after making changes to the settings. This will check all the changed parameters. If no errors is detected,
new parameters will be stored in the memory (new parameters will become effective upon the following restart/activation of the
unit). In case of any errors detected upon clicking the "Save" button, none of the parameters is saved, while the names of
erroneous parameters are highlighted in red.
Click "Factory reset" to restore the default value of parameters.
Click "Restart" to stop all connections and interrupt all receive/transmit operations, with the following restart of the unit.
In case of any changes to the parameters, either introduced or stored in the memory, these changes shall be implemented.
ET-485 NOVATEK-ELECTRO
~ 23 ~
Note: If the addressing parameters in Ethernet network (MAC-address, IP- address, DHCP settings) are
modified and saved, the browser may not load the page after the restart of the unit by pressing the “Restart” button.
This can happen as the browser continues to reply over the previous address. In this case, the connection should be
made anew.
Clicking the “Exit” button the will close the setup mode and a password request appears once again.
7.4 Configuring ЕТ-485 through Modbus interface
Setting via Modbus-interface shall be provided if the unit is connected over the Modbus client, which is supporting the
Modbus TCP protocol. The connection is established using its IP-address (factory setting - 192.168.0.111) with the indication
of Modbus-identifier (factory setting - 111).
Write the password string into the password input register (see Table 5) before setting parameters. Factory set
password – is 11111, i.e. write 49 (ASCII-code for one) to record the factory set password to registers 0 - 4. If the password is
correct, the mode register (see Table 6) takes the value of 1 – setup mode.
The instruction register (see Table 5), as well as registers for the collection of Modbus customizable parameters (see
Table 7) are available for writing in the setup mode. When the required value is written to the registers of customizable
parameters, write 2 (instruction for “Saving”) in the instruction register. The accuracy of values for the stored parameters can
be checked by comparing the collections of customizable parameters and saved parameters. If collections are the same, new
values and settings shall be accepted and saved.
To reset the saved parameters to factory settings, write 3 (instruction for “Restoring to factory”) in the instruction
register.
Restart the unit for the saved settings to take effect. To restart via Modbus interface, write 1 (instruction for “Restarting”)
in the instruction register.
NOVATEK-ELECTRO ET-485
~ 24 ~
To exit the setup mode, write 0 instead of any character in password input register. This will clear all the password input
registers and instruction register (turn the values to 0).
8 COMPLETE SET
ET-485 is supplied with:
- ET-485 protocol converter ....................................................................................................... 1 piece
- User manual, passport ............................................................................................................ 1 piece
- Cable for Ethernet connection ................................................................................................. 1 piece
- Shipping box ............................................................................................................................ 1 piece
9 SERVICE LIFE AND WARRANTY
9.1
9.2
9.3





9.4
Service life – is 10 years. Contact manufacturer upon the expiry of the service life.
Guaranteed storage life – is 3 years.
Warranty period – is 36 moth from the date of sale.
The manufacturer shall provide a free repair of the unit within the warranty period if all the provisions of user
manual were complied with by the consumer.
The unit shall not be subject to warranty service in the following cases:
end of warranty period;
mechanical damage;
traces of moisture or foreign objects inside the unit;
traces of tampering;
damage by electric shock at a voltage, which is higher than maximum permissible voltage, as indicated in
the user manual.
Warranty service shall be provided at a place of purchase.
ET-485 NOVATEK-ELECTRO
~ 25 ~
9.5
9.6
The manufacturer's warranty does not apply to compensation for direct or indirect damages, loss or injury
associated with transporting the unit to the place of purchase or to the manufacturer.
Post-warranty service is provided by the manufacturer.
Note: Users are earnestly requested to indicate the reason for the return in case of a return of the unit or
transferring unit for warranty or post-warranty service in a special field (Data on claims).
10 TRANSPORTATION AND STORAGE
ET- 485 in the shipping box should be stored indoors at a temperature of -45 to +70C and relative humidity of no more
than 80% with no vapors available in the air, capable of producing harmful effect on the shipping box and unit materials.
When transporting ET- 485, the user should provide some protection against mechanical damage.
11 ACCEPTANCE CERTIFICATE
12 DATA ON CLAIMS
ET- 485 No. _____________________ is manufactured
and accepted in accordance with the applicable technical
documentation and considered fit for use.
Head of quality division ___________________
_____________________________
_____________________________
_____________________________
_____________________________
_____________________________
_____________________________
NOVATEK-ELECTRO ET-485
~ 26 ~
Place of stamp
Date of manufacture___________________
Please contact the manufacturer should you have any
questions.
NOVATEK ELECTRO INDIA PVT. LTD.
C-30, Patparganj Industrial Area, 1st flr. Delhi-110092, INDIA
Tel. +91 11 42143253, Tel/Fax. +91 11 43010600
Email: [email protected]
Web: www.novatek-electro.in
ET-485 NOVATEK-ELECTRO
_____________________________
_____________________________
_____________________________
_____________________________
_____________________________
_____________________________
Date of sale___________________
~ 27 ~
Appendix A
Switching to Ethernet
WARNING! Switching the unit to Ethernet network requires mutual coordination of settings on the connected devices.
Connecting the misconfigured unit to the network may affect the communication level of other units on the network. As a rule,
all connections to a network of more than 2 units are carried out by the qualified personnel (network administrator) only.
1.
IP-addressing
When units are communicating over Ethernet network using TCP/IP protocol, every unit is using a set of IP-addressing settings to identify
the sender and receiver of the data. The unit memory contains a personal and unique, within a single subnet, IP-address (four bytes are written as
four integers, separated by dots, in the range of 0-255), subnet mask, which is the same for all units within the subnet (written similar to IP-address),
and IP-address of the gateway, which is used to communicate with other networks. Proper communication between units of a subnet is possible
under several conditions:
1)
All units of a subnet have similar mask. Most of small LANs are using 255.255.255.0 mask.
2)
Mask starts with a group of bits set to 1, followed by a group of bits turned to 0.
3)
All bits set to 1 in the mask are similar for all the IP-addresses of units in subnet and indicate the subnet address. 192.168 is most
frequently used address in LANs for the mask 255.255.255.0. The third byte may be used as a subnet number in a complex LAN. In smaller
LANs, the third byte is usually equal to 0.
4)
A set of bits in IP-address of the unit, which is set to 0 in the mask, is unique to each unit within the same subnet .
5)
In most cases, the unit like router, which is already communicating with other networks, is switched to the network. This unit often gets the
following address 192.168.0.1, 192.168.0.100, or 192.168.0.101. In this case, other units in the network shall have this IP-address of the
unit as the gateway address. This address is not necessary for communication between units in a subnet, and is only used to connect units
of one subnet to units of other networks.
NOVATEK-ELECTRO ET-485
~ 28 ~
Factory addressing settings for ET-485 Interface Converter are listed in Table A.1.
Table А.1 – Factory settings for ET-485 addressing
Parameter
Value
IP-address
192.168.0.111
Subnet mask
255.255.255.0
Gateway
192.168.0.1
In order to communicate with ET-485, which is set to factory settings, the client unit (or any other units on the same subnet) should have
255.255.255.0 as a mask and address starting with 192.168.0. The fourth byte of the address can take any value in the range from 1 to 255, except
for 111. If the connection between ET-485 and a client unit is not provided directly but via a network with a number of units, the mentioned address
can not be equal to any of the addresses of other units on the subnet . If network has several units with the mask and the first three bytes of the IPaddress, which are different from those specified in Table A.1, or the ET-485 factory IP-address is already taken, the configurable unit should be
temporarily removed from the network to avoid addressing conflicts and establish a communication between this unit and ET- 485 directly. This will
allow to configure the unit and ET-485 for direct communication or switching ET-485 to the network.
2.
Configuring the client unit
The unit addressing is set according to documents and software it uses.
Below is an example of configuring the personal computer (PC) on Windows XP or Windows 7 to communicate directly with the ET-485 on
factory settings.
Open the list of OS network connections to configure the network address in Windows. To do this, follow the steps below (mind the OS
version):

For Windows XP:
1)
Log in as administrator.
2)
Select Start-Control Panel.
3)
If control panel items are divided into categories, select "Network and Internet Connections".
4)
Go to "Network Connections".
ET-485 NOVATEK-ELECTRO
~ 29 ~

For Windows 7:
1)
Log in as administrator.
2)
Select Start-Control Panel.
3)
If control panel items are divided into categories, select "Network and Internet".
4)
Go to "Control Center Network and Sharing Center".
5)
In the task bar (on the left), select "Change adapter settings".
Next, perform the following steps:
In the Connections window, select the desired connection via an adapter with the addressing that you want to change. Many
computers have only one adapter and one connection, which will be displayed in this window. If the window shows several
connections, select the connection you want , using the adapter name in the information on connection or contact your system
administrator.
2)
Click the icon of the connection with the right button, and select "Properties" in the drop-down menu. The Properties window opens
(see Fig. A.3).
3)
Select "Internet Protocol (TCP/IP)" from the list of connection components in the next window. Make sure that the component i s
enabled (flagged in the list) . Click "Properties". The TCP/IP properties window opens (see Fig. A.4).
4)
Select "Use the following IP- address".
5)
Specify the address in the "IP- address" field within the range from 192.168.0.1 to 192.168.0.255 (except for 192.168.0.111, which
is used by ET-485).
6)
Specify "255.255.255.0" in the “Subnet Mask” field.
7)
The fields "Default Gateway", "Preferred DNS-server", and "Alternative DNS- server" should be left blank.
8)
Press "OK" to close the Protocol Settings window.
9)
Press "OK" to close the Connections Settings window.
10)
If prompted by the OS to restart the PC after closing the windows, answer yes.
1)
NOVATEK-ELECTRO ET-485
~ 30 ~
Figure А.3 – Connection properties window
in Windows OS
ET-485 NOVATEK-ELECTRO
Figure А.3 – TCP/IP properties window
in Windows OS
~ 31 ~
3.
Switching to Internet
WARNING! The user is strongly recommended to connect the unit to Internet under the supervision of the LAN system
administrator and/or representative of Internet service provider.
Use the following guidelines to connect the unit to Internet:
acquire a dedicated line with a static IP-address from your Internet Service Provider (hereinafter referred to as – ISP);
several connection options are possible if your ISP binds the connection to MAC-address, and the given Internet connection was already
used by personal computers or other units:
a) connect the unit directly to the PC (see Section 5.2.1) to learn the MAC-address of the unit (see Section 7). Inform the ISP on the change of
MAC-address to the MAC-address of the unit;
b) determine the MAC-address for Internet connection from the unit settings, which was previously using this connection, or acquire it from your
ISP. Connect the unit directly to the PC and change the parameters "Enable manual MAC-address" and "Manually set MAC-address" to
have the manual MAC-address enabled and values of the unit correspond to MAC- address with an Internet connection binded;

direct connection of the unit to the ISP cable is not recommended; in case of a router connection, the ISP cable is connected to the "Uplink"
socket on the router (It is usually marked with color and has no numbers. The marking depends on the router manufacturer, see the router
documentation). The straight-through (supplied) Ethernet cable is used for connecting unit to the router. Set the router for Internet
connection as per ISP recommendations using the router documentation. The router settings should also provide for the redirection of
requests, which are coming to static IP-address provided by the ISP, to the unit IP-address (factory setting - 192.168.0.111);

verify if the Internet connection is protected by standard means (see below);

when referring the unit via Internet, use IP-address provided by your ISP.


NOVATEK-ELECTRO ET-485
~ 32 ~
4.





Protection of connection
ET-485 has basic protection against unauthorized access over Ethernet.
IP-address filter for configuration can be enabled to restrict access to HTTP and Modbus interfaces of the unit to a single specified address,
without restricting access to the Modbus (RS-485);
IP-address filter for Modbus TCP can be enabled to restrict access via Modbus TCP to the Modbus network (RS- 485) and unit to a single
specified address;
unit settings can be changed remotely by entering the password (minimum 5 characters). Entering several incorrect passwords while trying
to determine the correct one is blocked by the unit.
when entering the password, all settings shall be only available to a given client using a given protocol. In case of no requ ests from the
client over the long period, the access returns to locked mode.
Note: The setup mode is provided over an unprotected connection upon entering the correct password. The users are strongly
recommended to enable the "IP-connections filter for configuration" option of ET- 485 in case of network configuration (especially for
networks without other types of protection).


The unit protection system is not designed to counter malicious network attacks (especially those, which are not trying to ge t access to the
unit but to block it instead);
In case of complex and large networks (especially when providing access to the ET-485 via Internet), the users are recommended to
separate the unit from unprotected networks with standard protective equipment (router, configured to filter the transmissions, Firewall,
etc.).
ET-485 NOVATEK-ELECTRO
~ 33 ~
Appendix B
Character codes under ASCII standard
Code
*
Characte
r
Code
*
Characte
r
Code
*
Characte
r
Code
*
Characte
r
Code
*
Characte
r
Code
*
Characte
r
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
(space)
!
“
#
$
%
&
‘
(
)
*
+
,
.
/
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
0
1
2
3
4
5
6
7
8
9
:
;
<
=
>
?
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
@
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
P
Q
R
S
T
U
V
W
X
Y
Z
[
\
]
^
_
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
`
a
b
c
D
e
f
g
h
i
j
k
l
m
n
o
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
p
q
r
s
t
u
v
w
x
y
z
{
|
}
~
* – all codes are provided in decimal numeration system
NOVATEK-ELECTRO ET-485
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