Template:Networking rut manual modbus

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Summary

Modbus is a serial communications protocol. Simple and robust, it has become a de facto standard communication protocol and is now a commonly available means of connecting industrial electronic devices. This chapter is an overview of the Modbus TCP functionality for {{{name}}} devices.

The information in this page is updated in accordance with the [[Media:{{{fw_version}}}_WEBUI.bin|{{{fw_version}}}]] firmware version.

Modbus TCP

Modbus TCP provides users with the possibility to set or get system parameters. The Modbus daemon acts as slave device. That means it accepts connections from a master (client) and sends out a response or sets some system related parameter in accordance with the given query.

The figure below is an example of the Modbus TCP window section and the table below provides information on the fields contained in that window:

[[File:{{{file_modbus_tcp}}}]]

Template:Networking rut9xx manual modbus modbus tcp table

Get Parameters


Modbus parameters are held within registers. Each register contains 2 bytes of information. For simplification, the number of registers for storing numbers is 2 (4 bytes), while the number of registers for storing text information is 16 (32 bytes). The register numbers and corresponding system values are described in the table below:

{{Template: Networking_{{{name}}}_manual_modbus_modbus_tcp_get_parameters_table}}

Set Parameters


The Modbus daemon can also set some device parameters. These parameters and explanations on how to use them are described in the table below:

{{Template: Networking_{{{name}}}_manual_modbus_modbus_tcp_set_parameters_table}}

* All ON/OFF commands only accept 0 and 1 values, which represent the following:

  • 1 - ON
  • 0 - OFF

Modbus TCP Master

A Modbus master device can request data from Modbus slaves. The Modbus TCP Master section is used to configure Modbus TCP slaves. To add a new slave, enter a custom name, slave's ID, IP address and port and click the "Add" button: [[File:{{{file_add_new_slave}}}]]

Button Description
Edit Redirects you to the slave's configuration page (more information in [[{{{name}}} Modbus#Slave_device_configuration|section 3.1]])
Delete Deletes the slave configuration
Alarms Redirects you to the slave's alarm configuration page (more information in [[{{{name}}} Modbus#Alarm_configuration|section 3.3]])
Clone Creates an identical slave configuration

You can create a maximum of 10 slave configurations.

Slave device configuration


The figure below is an example of the Slave device configuration and the table below provides information on the fields contained in that section:

[[File:{{{file_slave_configuration}}}]]

Field Value Description
Enabled yes | no; default: no Turns communication with the slave device on or off.
Name string; default: none Slave device's name, used for easier management purposes.
Slave ID integer [0..255]; default: none Slave ID. Each slave in a network is assigned a unique identifier ranging from 1 to 255. When the master requests data from a slave, the first byte it sends is the Slave ID. When set to 0, the slave will respond to requests addressed to any ID.
IP address ip; default: none Slave device's IP address.
Port integer [0..65535]; default: none Slave device's Modbus TCP port.
Period integer [1..6400]; default: none Interval at which requests are sent to the slave device.
Timeout integer [1..30]; default: none Maximum response wait time.

Requests configuration


A Modbus request is a way of obtaining data from Modbus slaves. The master sends a request to a slave specifying the function code to be performed. The slave then sends the requested data back to the Modbus master. You can create a maximum of 64 request configurations for each slave device.

The figure below is an example of the Requests configuration section and the table below provides information contained in the fields of that section:

[[File:{{{file_requests}}}]]

Field Value Description
Name string; default: Unnamed Parameter Request name. Used for easier management purposes.
Data type 8bit INT | 8bit UINT | 16bit INT, high byte first | 16bit INT, low byte first | 16bit UINT, high byte first | 16bit UINT, low byte first | 32bit float, Byte order 1,2,3,4 | 32bit float, Byte order 4,3,2,1 | 32bit float, Byte order 2,1,4,3 | 32bit float, Byte order 3,4,1,2; default: 16bit INT, high byte first How read data will be stored.
Function 1 | 2 | 3 | 4 | 5 | 6 | 15 | 16; default: 3 A function code specifies the type of register being addressed by a Modbus request. The codes represent these functions:
  • 1 - read Coil Status
  • 2 - read Input Status
  • 3 - read Holding Registers
  • 4 - read Input Registers
  • 5 - force Single Coil
  • 6 - preset Single Register
  • 15 - force Multiple Coils
  • 16 - force Multiple Registers
First Register integer [1..65536]; default: 1 First Modbus register number from which data will be read.
Note.: RUT9XX Modbus Master uses register numbers, which value is +1 higher than address value.
Number of Registers integer [1..2000]; default: none Number of Modbus registers that will be read during the request.
Enabled yes | no; default: no Turns the request on or off.
Test - (interactive button) Generates a Modbus request according to given parameters in order to test the request configuration. You must first save the configuration before you can use the Test button.
Delete - (interactive button) Deletes the request.
Add - (interactive button) Adds a new request configuration.

Alarm configuration


Alarms are a way of setting up automated actions when some Modbus values meet user specified conditions. The figure below is an example of the Alarm configuration page and the table below provides information on fields that it contains:

[[File:{{{file_alarms}}}]]

Field Value Description
Enabled yes | no; default: no Turns the alarm on or off
Function code Read Coil Status (1) | Read Input Status (2) | Read Holding Registers (3) | Read Input Registers (4); default: Read Coil Status (1) Modbus function used in Modbus request.
Register integer [0..65535]; default: none Number of the Modbus coil/input/holding register/input register that will be read.
Condition More than | Less than | Equal to | Not Equal to; default: Equal to When a value is obtained it will be compared against the value specified in the following field. The comparison will be made in accordance with the condition specified in this field.
Value various; default: none The value against which the read data will be compared.
Action SMS | Trigger output | Modbus Request; default: SMS Action that will be taken if the condition is met. Possible actions:
  • SMS - sends and SMS message to a specified recipient(s).
  • Trigger output - changes the state of a specified output(s).
  • Modbus Request - sends a Modbus request to a specified slave.
SMS: Message string; default: none SMS message text.
SMS: Phone number phone number; default: none Recipient's phone number.
Trigger output: Output Open collector output | Relay output | Both; default: Open collector output Which output(s) will be triggered.
Trigger output: I/O Action Turn On | Turn Off | Invert; default: Turn On Action that will taken on the specified output.
Modbus Request: IP address ip | host; default: none Modbus slave's IP address.
Modbus Request: Port integer [0..65535]; default: none Modbus slave's port.
Modbus Request: Timeout integer [1..30]; default: 5 Maximum time to wait for a response.
Modbus Request: ID integer [1..255]; default: none Modbus slave ID.
Modbus Request: Modbus function Read Coil Status (1) | Read Input Status (2) | Read Holding Registers (3) | Read Input Registers (4) | Force Single Coil (5) | Preset Single Register (6) | Force Multiple Coils (15) | Force Multiple Registers (16); default: Force Single Coil (5) A function code specifies the type of register being addressed by a Modbus request.
Modbus Request: First register integer [0..65535]; default: none Begins reading from the register specified in this field.
Modbus Request: Number of registers integer [0..65535]; default: none The number of registers that will be read from the first register.


Modbus Data to Server

The Modbus Data to Server function provides you with the possibility to set up senders that transfer data collected from Modbus slaves to remote servers. To add a new data sender, enter the server's address, specify the data sending period and click the "Add" button:

[[File:{{{file_add_new_sender}}}]]

Data sender configuration


When you add a new data sender, you will be redirected to its configuration window. The figure below is an example of that window and the table below provides information on the fields that it contains:

[[File:{{{file_sender_configuration}}}]]

Enabled yes | no; Default: no Turns the data sender ON or OFF
Name string; Default: none Data sender's name. used for easier management purposes
Protocol HTTP(S) | MQTT; Default: HTTP(S) Data sending protocol
JSON format json string; Default: {"ID":"%i", "TS":"%t","ST":"%s","VR":"%a"} Provides the possibility to fully customize the JSON segment
Segment count 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10; Default: 1 Max segment count in one JSON string sent to server
URL host | ip; Default: none Address of the server to which the data will be sent. .
Important note: when using HTTPS, remember to add the https:// prefix before the URL
Period integer [1..6400]; Default: none Data sending frequency (in seconds)
Data filtering All data | By slave ID | By slave IP; Default: All data Which data this sender will transfer to the server
Retry on fail yes | no; Default: no Specifies whether the data sender should retry failed attempts
Custom header string; Default: no Adds a custom header(s) to HTTP requests

See also

Template:Networking device modbus see also

[[Category:{{{name}}} Services section]]