Novatek-electro ET-485 Manual de usuario

NOVATEK-ELECTRO LTD

Intellectual Industrial Electronics

Protocol converter

Modbus RTU/ASCII (RS-485)–

Modbus TCP (Ethernet)

ЕТ- 485

OPERATING MANUAL

Quality control system on the production complies with requirements ISO 9001:2008

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.

UKRAINE, Odessa

www.novatek-electro.com

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ЕТ-485

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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

6.4 The operation of ET-485 in the mode of active connection to the client

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

APPENDIX A. Switching to Ethernet

APPENDIX B. Character codes under ASCII standard

APPENDIX C. Symbol codes according to ASCII

1 DESIGNATION

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ЕТ-485

ЕТ-485 is a microprocessor unit.

The unit is designed to provide data exchange between the equipment, connected to Ethernet 10BASE-T and

100BASE-T network, and the equipment, supplied with RS-485 interface and forming Modbus network. The

examples of network topology with application of ЕТ-485 are shown in appendix B.

The unit fulfills the functions of a Modbus-server for switching the Modbus-clients to the Ethernet network.

The unit provides functions of Modbus-server for connecting Modbus-clients within Ethernet network. In the RS-

485 master mode, the unit redirects Modbus-queries from the clients in Ethernet network to the devices in Modbus

network and returns the answers from the devices to the clients. In the query redirection to remote server mode,

the unit maintains the connection to Modbus TCP server in Ethernet network and in addition directs client queries

to this server. In the RS-485 slave mode, the unit in addition accepts RS-485 queries from a Modbus-client within

Modbus network.

ЕТ-485 has:

flexible addressing within the Ethernet network (overloading MAC-address, static and dynamic IP-address);

different data transfer modes for Modbus network (RTU and ASCII with/without odd-even check, wide range of

transmission speeds, selectable delay;

adjustable redirection of queries;

security access (IP address filtration and/or access password for condition reading, for setting the unit, for

connection to Modbus network, and for recording/reading within Modbus network).

ET-485 meets the following requirements:

Information processing equipment. Safety. Part 1. General requirements (ІEC 60950-1:2001).

Technology equipment. Radio disturbance characteristics. Limits and methods of measurement (СІSPR 22:2006).

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;

ACC - Active Connection to the Client, where connecting side acts as a server;

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;

DCRS - Data Collection Remote Server, to which ET-485 connects in the ACC mode

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.

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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

230

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

Integrated servers

Modbus-server, HTTP-server

Data Exchange Interface over the Modbus network

RS-485

Modbus network exchange modes

Driving (Master) / Driven (Slave)

Supported Modbus protocols

Modbus RTU, Modbus ASCII

RS-485 driver maximum output voltage, V

3.3

RS-485 output current of short circuit driver (limiting), mA

250

Integrated terminator resistance, Ohm

300

Recommend number of connected units within the Modbus network*

32, not more

Indication

LED’s

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

0.200

Dimensions, mm

95 х 52 х 67

Unit purpose

Communication equipment

Nominal operation condition

continuous

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

Permissible pollution density

Overvoltage category

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

* –when input current of connected device receivers equals 1 mA and equivalent resistance of RS-485 bus

terminators equals 60 ohm.

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

3. STRUCTURE AND FUNCTIONING

3.1. STRUCTURE

3.1.1. Design

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ЕТ-485

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 1.

Figure 1 –Overall dimensions of the unit

3.1.2. Display and control

The front panel of ЕТ-485 is provided in Figure 2.

1 –Reset button "R" (the «R»reset button (is under the body

and accessible for pressing through the opening in the body)

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 2 –Front panel of ET-485

3.2. FUNCTIONING

Simplified structural diagram of the unit is provided in Figure 3.

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.

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Note –When restarting the unit, the clients may need to renew the connections.

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 3 –Structural diagram of the unit

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.

4.1.6 The following regulations should be enforced while operating and maintaining the unit: "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

The unit is switched according to the diagram, see Fig. 4.

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 400V) to “230V” socket, and then connect the cable to the power supply

230V, 50 Hz

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.

After that, both indicators go out within 0.5 second and the unit starts working (Ethernet network connection may

take more time depending on the settings of the unit as well as other units connected to the network).

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ЕТ-485

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.

Figure 4 –Unit connection diagram

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).

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 connecting a client to Modbus TCP port, the unit adds it to the internal list of served clients (but not

exceeding the number of clients, specified in the technical characteristics).

When connection of the client is established, the unit awaits a Modbus-query from the client. In the RS-485 slave

mode,the device also accepts RS-485 queries from the master device of Modbus network.

When the query from the client has been received, the unit analyzes the query and, depending on the

requested function code and the current rights of the client, either processes or blocks it. When the query is

blocked, ET-485 can generate and transfer the client-specified Modbus exception code (default –code 1) to the

client. The rights of the client, depending on the settings, are determined according to its IP address (the Modbus

network master IP address is considered to be 127.0.0.1) and input passwords.

If the query is addressed to ЕТ-485, the unit does not redirect the query, processes it and transfers the answer

to the client.

In the RS-485 master mode, queries to other devices are redirected to Modbus network and an answer form

Modbus network is awaited –herewith the «RS-485»indicator will start to glow. If the data have been received or

the standby time has run out, the «RS-485» indicator will go out.

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In the remote server redirection mode, if connection to the client-specified Modbus TCP server in Ethernet

network has been established, queries to other devices are also sent to this server and an answer from it is awaited.

Note –The answer is received from the first answering addressee, therefore there must be no devices

with same Modbus addresses (identifiers) in Modbus network and among the addressees, available through

the remote server.

If a query failed to be redirected (e.g. in the RS-485 slave mode, if connection to the remote server was broken),

ET-485 can generate and transfer the client-specified Modbus exception code (default –code 10) to the client.

If there is no answer, ET-485 can generate and transfer the client-specified Modbus exception code (default –

code 11) to the client.

If the answer to the query has been received, ЕТ-485 transfers it to the client, which sent the query.

In case of any format errors, an “Error” indicator shall become activated for 0.5 seconds and no response is

provided to the client.

6.4 THE OPERATION OF ET-485 IN THE MODE OF ACTIVE CONNECTION TO THE CLIENT

In this mode in addition to providing other connections ET-485 autonomously establishes and further maintains

active connection to the client (data collection remote server) with a set host name or IP address.

ET-485 receives Modbus TCP queries from this client and returns responses. The mode allows one user to work with

one or more ET-485 units viathe Internet without static address assignment to each unit (see appendix B).

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).

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.

The unit describing parameters are given in Table 5.

The unit current mode parameters are available for reading and recording and specified in Table 6.

All parameters to determine the current condition of the unit (available for read-only) are provided in Table 7.

All parameters available in the configuration mode only are provided in Table 8.

ACC identification state parameters (table 9) are available for ACC and in a parameter mode.

ACC identification control parameters are available only for ACC and are described in table 10.

Table 3 –Collection of parameters available via Modbus protocol

Collection

Description

Access

Address

Acting settings

Current unit configuration

In any mode,

read-only

200–298,

1200–1241

Saved settings

The collection is saved regardless of power supply

and further used as the restart.

In configuration mode only,

read-only

300–398,

1300–1341

Factory

settings

Fixed collection, which can be activated as shown in

sections 7.3 and 7.4

In configuration mode only,

read-only

400–498,

1400–1441

Changeable

settings

All parameters listed in table 8, which can be modi-fied

and incorporated as described in Section 7.4

In configuration mode only,

reading and writing

500–598,

1500–1541

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

Number

0-4294967295 in two

registers,

upper part –first

Integer number, which can not exceed the limit for

Modbus register (65535)

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ЕТ-485

Character

string

In every register –ASCII

character code or 0 (end of

string)

The set of values, each one of which is equal to code

1 of a symbol in ASCII code.

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

MAC-

address

In every register –one byte

(0-255)

A set of six byte MAC-48 address, from left to right

Table 5 –The Unit Describing Parameters

Parameter

Description

Address

Unit type

Code identifying the Modbus unit by the manufacturer (12 –ET-485)

Firmware version

Version of firmware of the integrated software of the unit

Table 6 –The Unit Current Mode Parameters

Parameter

Min –Max

Initial value

Description

Address

Entering

password

String of

characters

When a valid password is input, the corresponding permit is

given to the client (see registers 543-580).

When an empty string is input, the rights of the client are reset

to the level of rights at the moment of connection.

100–119

Control

command

0-3,

writing in the

configuration

mode

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 7 –Parameters to determine the current condition of the unit

Parameter

Description

Address

Mode

(more detailed see register 141)

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

Modbus TCP clients limit

Total number of Modbus TCP connections (herewith, one

connection is always reserved for the main client)

133

Time, min

Number of minutes since the start

134–135

Modbus TCP loading, requests/sec

Number of requests processed in a second

136

Number of Ethernet network

congestions

Number of input buffer overflows for Ethernet –from the

moment of start-up

137

Number of communication errors

Number of identified errors (connection/communication) after

which the work was continued, - since the start

138

Number of programmed resets

Number of resets according to user’s setting – during all

working time of the unit

139

Number of critical errors

Number of identified errors (failures) resulting in a restart of the

unit - during the whole period of operation

140

Access mode flags

Bit 0

0: the connected client cannot get the permit for

requesting functions of non-recording the devices,

connected to ET-485

1: the connected client can get the permit for requesting

functions of non-recording the devices, connected to

ET-485

141

Bit 1

0: the connected client does not have the permit for

requesting functions of non-recording the devices,

connected to ET-485

1: the connected client has the permit for requesting

functions of non-recording the devices, connected to

ET-485

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Parameter

Description

Address

Bit 2

0: the connected client cannot get the permit for

requesting functions of recording the devices,

connected to ET-485

1: the connected client can get the permit for requesting

functions of recording the devices, connected to ET-485

Bit 3

0: the connected client does not have the permit for

requesting functions of recording the devices,

connected to ET-485

1: the connected client has the permit for requesting

functions of recording the devices, connected to ET-485

Bit 4

0: the connected client cannot get the permit for access

to ET-485 registers, except for registers of version,

password, mode and access flags

1: the connected client cannot get the permit for access

to ET-485 registers, besides registers of version,

password, mode and access flags

Bit 5

0: the connected client does not have the permit for

access to ET-485 registers, except for registers of

version, password, mode and access flags

1: the connected client has the permit for access to ET-

485 registers, except for registers of version, password,

mode and access flags

Bit 6

0: the connected client does not have the permit for

requesting function of recording ET-485

1: the connected client has the permit for requesting

function of recording ET-485

Bit 7

0: the connected client does not have the permit for

setting ET-485

1: the connected client has the permit for setting ET-485

(similar to register 121)

Bit 8

0: the client is not the main client

1: the client is the main client

Bit 9

1: the client has the right for connection

(always read as “1” after connection)

Bit 10

0: the client is connected not by ACC

1: the client is connected by ACC

Maximum of Modbus TCP clients

Maximum observed number of Modbus TCP clients (from the

moment of start-up)

142

Maximum of queries, queries/sec

Maximum observed load of Modbus (from the moment of start-

up)

143

Frequency of answered queries,

queries/sec

Number of processed queries per second, to which the answer

is formed without any errors

144

Time before connection to Modbus

TCP remote server

0: connection to remote server established

1: connection to remote server is being established

2 –65534: number of seconds to repeated connection

65535: redirection to remote server is off

145

Time before active connection to

the client (or DCRS)

0: ACC is established

1: ACC is being established

2 –65534: number of seconds to repeated ACC

65535: ACC is off

146

Table 8 –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 with static IP address

504–507

Gateway

IP-

address

192.168.0.1

Used only with static IP address or as an IP filter for

DHCP server

508–

511

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