RUTX09 Modbus

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Main Page > RUTX Routers > RUTX09 > RUTX09 Manual > RUTX09 WebUI > RUTX09 Services section > RUTX09 Modbus

The information in this page is updated in accordance with firmware version RUTX_R_00.02.04.1.

Summary[edit | edit source]

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 manual page provides an overview of the Modbus functionality in RUTX09 devices.

If you're having trouble finding this page or some of the parameters described here on your device's WebUI, you should turn on "Advanced WebUI" mode. You can do that by clicking the "Basic" button under "Mode", which is located at the top-right corner of the WebUI.

Networking rutx manual webui basic advanced mode v1.gif

Modbus TCP slave[edit | edit source]

A Modbus TCP slave listens for connections from a master (client) and sends out a response or sets some system related parameter in accordance with the given query. This provides the user with the possibility to set or get system parameters.

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:

Networking rutos manual modbus modbus tcp slave v2.png

Field Value Description
Enable yes | no; default: none Turns Modbus TCP on or off.
Port integer [0..65535]; default: 502 TCP port used for Modbus communications.
Device ID integer [0..255]; default: 1 The device's Modbus slave ID. When set to 0, it will respond to requests addressed to any ID.
Allow Remote Access yes | no; default: no Allows remote Modbus connections by adding an exception to the device's firewall on the port specified in the field above.
Keep persistent connection yes | no; default: no Allows keep the connection open after responding a Modbus TCP master request.
Connection timeout integer; default: 0 Sets TCP timeout in seconds after which the connection is forcefully closed.
Enable custom register block yes | no; default: no Allow custom register block.

Get Parameters[edit | edit source]


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:

required value register address register number number of registers representation
System uptime 1 2 2 32 bit unsigned integer
Mobile signal strength (RSSI in dBm) 3 4 2 32 bit integer
System temperature (in 0.1 °C) 5 6 2 32 bit integer
System hostname 7 8 16 Text
GSM operator name 23 24 16 Text
Router serial number 39 40 16 Text
LAN MAC address 55 56 16 Text
Router name 71 72 16 Text
Currently active SIM card slot 87 88 16 Text
Network registration info 103 104 16 Text
Network type 119 120 16 Text
Current WAN IP address 139 140 2 32 bit unsigned integer
GPS latitude coordinate 143 144 2 32 bit float
GPS longitude coordinate 145 146 2 32 bit float
GPS fix time 147 148 16 Text (Unix timestamp×1000)
GPS date and time 163 164 16 Text (DDMMYYhhmmss)
GPS speed 179 180 2 32 bit integer
GPS satellite count 181 182 2 32 bit integer
GPS accuracy 183 184 2 32 bit float
Mobile data received today (SIM1) 185 186 2 32 bit unsigned integer
Mobile data sent today (SIM1) 187 188 2 32 bit unsigned integer
Mobile data received this week (SIM1) 189 190 2 32 bit unsigned integer
Mobile data sent this week (SIM1) 191 192 2 32 bit unsigned integer
Mobile data received this month (SIM1) 193 194 2 32 bit unsigned integer
Mobile data sent this month (SIM1) 195 196 2 32 bit unsigned integer
Mobile data received last 24h (SIM1) 197 198 2 32 bit unsigned integer
Mobile data sent last 24h (SIM1) 199 200 2 32 bit unsigned integer
Active SIM card 205 206 1 32 bit unsigned integer
Mobile data received last week (SIM1) 292 293 2 32 bit unsigned integer
Mobile data sent last week (SIM1) 294 295 2 32 bit unsigned integer
Mobile data received last month (SIM1) 296 297 2 32 bit unsigned integer
Mobile data sent last month (SIM1) 298 299 2 32 bit unsigned integer
Mobile data received today (SIM2) 300 301 2 32 bit unsigned integer
Mobile data sent today (SIM2) 302 303 2 32 bit unsigned integer
Mobile data received this week (SIM2) 304 305 2 32 bit unsigned integer
Mobile data sent this week (SIM2) 306 307 2 32 bit unsigned integer
Mobile data received this month (SIM2) 308 309 2 32 bit unsigned integer
Mobile data sent this month (SIM2) 310 311 2 32 bit unsigned integer
Mobile data received last 24h (SIM2) 312 313 2 32 bit unsigned integer
Mobile data sent last 24h (SIM2) 314 315 2 32 bit unsigned integer
Mobile data received last week (SIM2) 316 317 2 32 bit unsigned integer
Mobile data sent last week (SIM2) 318 319 2 32 bit unsigned integer
Mobile data received last month(SIM2) 320 321 2 32 bit unsigned integer
Mobile data sent last month (SIM2) 322 323 2 32 bit unsigned integer
Digital non-isolated input (4 PIN connector) 324 325 1 32 bit unsigned integer
Digital open collector output (4 PIN connector) 325 326 1 32 bit unsigned integer
Modem ID 328 329 8 Text
IMSI 348 349 16 Text

Set Parameters[edit | edit source]


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

value to set register address register value description
Switch mobile data connection (ON/OFF*) 204 1 | 0 Turns mobile data connection ON or OFF
Switch SIM card 205 1 | 2 | 0 Changes the active SIM card slot
  • 1 - switch to SIM1
  • 2 - switch to SIM2
  • 0 - switch from the the SIM card opposite of the one currently in use (SIM1 → SIM2 or SIM2 → SIM1
Reboot 206 1 Reboots the router
Change APN 207 APN code Changes APN.
The number of input registers may vary depending on the length of the APN, but the very first byte of the set APN command denotes the number of the SIM card for which to set the APN. This byte should be set to:
  • 1 - to set APN for SIM1
  • 2 - to set APN for SIM2
Switch PIN 4 state 325 1|0 Toggles PIN 4 ON or OFF, when output is selected

Modbus TCP Master[edit | edit source]

A Modbus master device can request data from Modbus slaves. The Modbus TCP Master section is used to configure Modbus TCP slaves.

Networking rutos manual modbus modbus tcp master v1.png

To add a new slave, simply click the 'Add' button.

You can create a maximum of 10 slave configurations.

Slave device configuration[edit | edit source]


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

Networking rutos manual modbus modbus tcp master slave configuration v1.png

Field Value Description
Enabled off | on; default: off 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..86400]; default: 60 Interval at which requests are sent to the slave device.
Timeout integer [1..30]; default: 5 Maximum response wait time.

Requests configuration[edit | edit source]


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:

Networking rutos manual modbus modbus tcp master requests configuration v1.png

Field Value Description
Name string; default: Unnamed 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 Read coils (1) | Read input coils (2) | Read holding registers (3) | Read input registers (4) | Set single coil (5) | Set single coil register (6) | Set multiple coils (15) | Set multiple holding registers (16); default: Read holding registers (3) Specifies the type of register being addressed by a Modbus request.
First Register integer [0..65535]; default: 1 First Modbus register from which data will be read.
Register Count / Values integer [1..2000]; default: 1 Number of Modbus registers that will be read during the request.
Enabled off | on; default: off Turns the request on or off.
Delete [ X ] - (interactive button) Deletes the request.

After having configured a request, you should see a new 'Testing' section appear. It is used to check whether the configuration works correctly. Simply press the 'Test' button and a response should appear in the box below.

Networking rutos manual modbus modbus tcp master requests configuration testing v1.png

Alarms Configuration[edit | edit source]


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 Alarms Configuration list.

Networking rutos manual modbus modbus tcp master alarms configuration v1.png

It is empty by default. So, to begin editing click the 'Add' button and you should be redirected to a page such as this:

Networking rutos manual modbus modbus tcp master alarms configuration alarm configuration v1.png

Field Value Description
Enabled off | on; default: off 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 for this alarm's Modbus request.
Register integer [1..65536]; default: none Number of the Modbus coil/input/holding-register/input-register to read from.
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.
Value integer [0..65535]; default: none The value against which the read data will be compared.
Action frequency Every trigger | First trigger; default: Every trigger Describes how frequently the specified action will be taken.
Redundancy protection off | on; default: off Protection against executing a configured action too often.
Redundancy protection period integer [1..86400]; default: none Duration to activate redundancy protection for, measured in seconds. This field becomes visible only when 'Redundancy protection' is turned on.
Action SMS | MODBUS Write Request; default: MODBUS Write Request Action that will be taken if the condition is met. Possible actions:
  • SMS - sends and SMS message to a specified recipient(s).
  • Modbus Request - sends a Modbus Write request to a specified slave.
SMS: Message string; default: none SMS message text.
SMS: Phone number phone number; default: none Recipient's phone number.
MODBUS Write Request: IP address ip | host; default: none Modbus slave's IP address.
MODBUS Write Request: Port integer [0..65535]; default: none Modbus slave's port.
MODBUS Write Request: Timeout integer [1..30]; default: 5 Maximum time to wait for a response.
MODBUS Write Request: ID integer [1..255]; default: none Modbus slave ID.
MODBUS Write Request: Modbus function Read 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 Write Request: First register integer [0..65535]; default: none Begins reading from the register specified in this field.
MODBUS Write Request: Values integer [0..65535]; default: none Register/Coil values to be written (multiple values must be separated by space character).

See also[edit | edit source]