Novatek ET- 485 User manual

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

~ 2 ~
ET-485 NOVATEK-ELECTRO
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.

~ 3 ~
NOVATEK-ELECTRO ET-485
CONTENT
1. Purpose
5
2. Specifications
6
2.1. Main specifications
6
2.2. Operating conditions
7
3. Structure and Functioning
8
3.1. Structure
8
3.1.1. Design
8
3.1.2. Display and control
9
3.2. Functioning
9
4. Maintenance and safety measures
11
4.1. Safety measures
11
4.2. Maintenance procedure for ЕТ-485
11
5. Connecting the ЕТ-485
12
6. Operating the ЕТ-485
13
6.1. General information
13
6.2. Operating ЕТ-485 over the HTTP protocol
13
6.3. Operating ЕТ-485 over the Modbus TCP protocol
13
7. Settings
14
7.1. General information
14
7.2. Parameters of ЕТ-485
15
7.3. Configuring ЕТ-485 through WEB interface
27
7.4. Configuring ЕТ-485 through Modbus interface
28
8. Complete set
28
9. Service life and warranty
29
10. Transportation and storage
30
11. Acceptance certificate
30
12. Data on claims
31
Appendix A. Switching to Ethernet
32
Appendix B. Character codes under ASCII standard
38

~ 4 ~
ET-485 NOVATEK-ELECTRO
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.

~ 5 ~
NOVATEK-ELECTRO ET-485
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).
Web based interface for easy configuration and
monitoring.
Maximum current consumption 10mA (220VAC) Figure 1 –Network mapping with the unit

~ 6 ~
ET-485 NOVATEK-ELECTRO
2. SPECIFICATIONS
2.1 Main specifications
Main specifications are resulted in Table 1.
Table 1 –Main specifications of the unit
Operating supply voltage, VAC
220-240
Voltage to maintain normal operation, V
- alternating current
- direct current
100 –250
140 –350
Supply frequency, Hz
47 –63
Data Exchange Interface over the Ethernet network
10BASE-T/100BASE-T (twisted pair)
Supported Ethernet protocols
Modbus TCP, HTTP
Maximum number of connections over the Modbus TCP protocol
11
Integrated servers
Modbus-server,
HTTP-server
Data Exchange Interface over the Modbus network
RS-485
Supported Modbus protocols
Modbus RTU,
Modbus ASCII
Maximum number of connected units within the Modbus network
32
LED
_
Readiness time upon switching the unit to the mains, sec, no more than
1
Utilized current (in case of 220 V), mA, at most
10
Weight, kg, at most
0.200
Dimensions, mm
95 х 52 х 67
Unit purpose
Communication equipment
Nominal operation condition
continuous

~ 7 ~
NOVATEK-ELECTRO ET-485
Terminal bus specifications
- cross-section of switched conductors, mm2
- maximum effort (torque) on screw terminals, Nm
0.3 –3
0.4
Level of protection:
- unit
- terminal bus
ІР30
IP20
Protection class against electrical shock
II
Climatic version
УХЛ3.1
Permissible pollution density
II
Overvoltage category
II
Rated insulation voltage, V
450
Rated impulse withstand voltage, kV
2.5
Operating position
arbitrary
Pollutants in the amount,
which is not to exceed the maximum permissible concentration
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
from minus 35 to +55
Storage temperature, °С
from minus 45 to +70
Atmospheric pressure, kPa
from 84 to 106.7
Relative air humidity (at 25°С), %
from 30 to 80

~ 8 ~
ET-485 NOVATEK-ELECTRO
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

~ 9 ~
NOVATEK-ELECTRO ET-485
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.

~ 10 ~
ET-485 NOVATEK-ELECTRO
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.
Figure 4 –Structural diagram of the unit
DC power
Processor ARM cortex
m3
Control panel
LED module
(unit status
indication)
Reset button

~ 11 ~
NOVATEK-ELECTRO ET-485
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

~ 12 ~
ET-485 NOVATEK-ELECTRO
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 non-
inverted 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
conductor cable with the cross-section of 0.75 mm2and
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

~ 13 ~
NOVATEK-ELECTRO ET-485
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).

~ 14 ~
ET-485 NOVATEK-ELECTRO
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 ET-
485, 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).

~ 15 ~
NOVATEK-ELECTRO ET-485
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
Address
Acting settings
Current unit configuration
In any mode,
read-only
200-262
Saved
settings
The collection is saved regardless of power supply and
further used as the restart.
In configuration mode only,
read-only
300-362
Factory
settings
Fixed collection, which can be activated as shown in
sections 7.3 and 7.4
In configuration mode only,
read-only
400-462
Changeable
settings
All parameters in Table 7, which can be modified and
incorporated as described in Section 7.4
In configuration mode only,
reading and writing
500-562
Table 4 –Presentation format of parameters in Modbus registers
Parameter
Range of values
Description
Number of Registers
Number
0-65535
Integer (16 bits) in a standard range of Modbus
register
1
Number
0-4294967295 in two registers,
upper part –first
Integer number, which can not exceed the limit
for Modbus register (65535)
2
Set of values, each of which is equal to code 1 of

~ 16 ~
ET-485 NOVATEK-ELECTRO
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.
Maximum length
of the string for the
given parameter
IP-address
(IP-mask)
In every register –one byte (0-255)
A set of four byte IPv4 address, from left to right
4
MAC-
address
In every register –one byte (0-255)
A set of six byte MAC-48 address, from left to
right
6
Table 5 –Parameters to control the current operating mode of the unit
Parameter
Min –Max
Initial value
Description
Address
Entering
password
String of characters
0
Configuration mode is available upon entering the valid
password
100-119
Control
command
0-3,
writing in the
configuration
mode
0
0: no activity
1: «Restart» –unit restart
2: «Save» –save the changed settings on the Modbus
3: «Factory reset» –reset the unit to factory settings
120
Table 6 –Parameters to determine the current condition of the unit
Parameter
Description
Address
Mode
0: User mode
1: Configuration mode
121
Current IP-address
IP-address of the unit in Ethernet network
122-125
Current MAC-address
MAC-address to authenticate the unit in Ethernet network
126-131
Number of Modbus TCP clients
Number of connections provided over the Modbus TCP protocol
132
Maximum number of Modbus TCP
clients
Total number of possible connections to Modbus TCP
133
Time, min
Number of minutes since the start
134-135

~ 17 ~
NOVATEK-ELECTRO ET-485
Parameter
Description
Address
Modbus TCP loading, requests/sec
Number of requests processed in a second
136
Number of Ethernet network
congestions
Number of incoming buffer overflows for Ethernet (which may result
in a data loss) –since the start
137
Number of communication errors
Number of identified errors (connection/communication) after which
the work was continued, - since the start
138
Number of periodic restarts
Number of preset restarts –during the whole period of operation
139
Number of critical errors
Number of identified errors (failures) resulting in a restart of the unit -
during the whole period of operation
140
Table 7 –Unit configuration settings
Parameter
Min –Max
Factory setting
Description
Address
Addressing in the Ethernet network
Static IP-address
IP-
address
192.168.0.111
IP-address of the unit in Ethernet network shall be equal to this
value if dynamic addressing is disabled or not available.
500–503
Subnet mask
IP-mask
255.255.255.0
Used only together with a static IP-address
504-507
Gateway
IP-address
192.168.0.1
Used only together with a static IP-address, or as an IP-address
filter for DHCP-server
508-511
Enable dynamic
addressing via
DHCP-server
0-1
0
0: preset IP-address, mask and gateway is used for addressing
in Ethernet.
1: DHCP network server is used by the unit to determine IP-
address, mask and gateway. The parameters for static
addressing are used if server is unavailable
512

~ 18 ~
ET-485 NOVATEK-ELECTRO
Parameter
Min –Max
Factory setting
Description
Address
Enable IP-
address filter of
the DHCP server
0-1
0
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 IP-
address of the gateway
513
Enable manually
set MAC-address
0-1
0
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
514
manually set
MAC-address
MAC-
address
Unique for
every unit
Used if manually set MAC-address is enabled for the
authentication of unit in the Ethernet network
515-520
Switching to Ethernet network
Connection port for
Modbus TCP
1-65535
502
Used in case of TCP-connection to the unit via Ethernet to
exchange data over Modbus TCP protocol
521
IP-address of the
primary client
IP-address
192.168.0.2
IP-address, for which one connection via Modbus TCP is
reserved. Address, which is used for unit configuration.
522-525
Enable the IP-
connections
filter for
configuration
0-1
0
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
526
Enable the IP-
connections
filter over
Modbus TCP
0-1
0
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
527

~ 19 ~
NOVATEK-ELECTRO ET-485
Parameter
Min –Max
Factory setting
Description
Address
Enable
replacement of
non-active
clients
0-1
1
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
528
Maximum query
timeout, sec
0-9999
90
Used, if replacement of non-active clients is enabled
529
Enable the queue
for the last busy
Modbus TCP
connection
0-1
0
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
The maximum hold
time of the last
connection to
Modbus TCP,
msec
0-600,000
60,000
Used, if the queue is enabled for the last connection to Modbus
TCP
531–532
Modbus network
Own Modbus-
identifier of the unit
0-247
111
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
533

~ 20 ~
ET-485 NOVATEK-ELECTRO
Parameter
Min –Max
Factory setting
Description
Address
Bit rate in Modbus-
network, bit/sec
75 –
1,500,000
9,600
Used in case of data exchange between the units in Modbus-
network, the same value for all units in Modbus-network
534-535
Enable the odd-
even check
0-1
0
Used in case of data exchange between the units in Modbus-
network, 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
536
Enable the odd-
even check
(to verify odds)
0-1
0
Used in case of data exchange between the units in Modbus-
network, if odd-even check is enabled. The same value for all
units in Modbus-network
0: Parity check
1: Imparity check
537
Response time
from Modbus RTU,
msec
0-60,000
200
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).
538