RUT955 Modbus: Difference between revisions

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==Summary==
==Summary==


'''Modbus''' is a serial communications protocol. Simple and robust, it has since 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.
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==Modbus TCP==
==Modbus TCP==


'''Modbus TCP''' interface allows the user to set or get router parameters like modem temperature, signal strength, etc. In other words, Modbus TCP allows you to control the router's behavior and get its status information. Modbus daemon acts as slave device. That means it accepts connections from the master (client) and sends out a response or sets some system related parameter. By the default Modbus will only accept connections through LAN interface. In order to accept connections through WAN interface also, Allow Remote Access must be checked.
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[[File:Rut9xx webui services modbus modbus tcp v1.png]]
[[File:Rut9xx webui services modbus modbus tcp v1.png]]


{| class="wikitable"
{{Template: webui_services_modbus_modbus_table}}
|+
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enable
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles Modbus TCP ON or OFF
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Port
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer [0..65535]; Default: " "
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Specifies which port to use for Modbus connections
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Allow Remote Access
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | If enabled, allows Modbus access from remote devices (from WAN)
|-
|}


===Get Parameters===
===Get Parameters===

Revision as of 10:42, 5 November 2018

Main Page > EOL Products > RUT955 > RUT955 Manual > RUT955 WebUI > RUT955 Services section > RUT955 Modbus

Summary

Template:Webui services modbus summary

Modbus TCP

Template:Webui services modbus modbus tcp

Template:Webui services modbus modbus table

Get Parameters

To obtain parameters from the system, the read holding registers command is used. Router parameters are held within registers. Each register contains 2 bytes of information. For simplification the number of registers for storing numbers is 2, while the number of registers for storing text information is 16. The register numbers and corresponding system values are described below:

REQUIRED VALUE REPRESANTATION REGISTER NUMBERS NUMBER OF REGISTERS
System uptime 32 bit unsigned integer 1 2
GSM signal strength (dBm) 32 bit integer 3 2
System temperature in 0.1 degrees Celcius 32 bit integer 5 2
System hostname Text 7 16
GSM operator name Text 23 16
Router serial number Text 39 16
Router MAC address Text 55 16
Router name Text 71 16
Current SIM card Text 87 16
Network registration Text 103 16
Network type Text 119 16
Digital input 1 32 bit integer 135 2
Digital input 32 bit integer 137 2
Current WAN IP address 32 bit unsigned integer 139 2
Analog input 32 bit integer 141 2

Set Parameters

The Modbus daemon also supports setting of some system parameters. For this task the Write holding register command is used. System related parameters and how to use them are described below. The register number specifies where to start writing the required values. All commands, except “Change APN”, accepts only one input parameter. For the APN the number of input registers may vary. The very first byte of APN command denotes a number of SIM card for which set the APN. This byte should be set to 1 (in order to change APN for SIM card number 1) or to 2 (in order to change APN for SIM card number 2).

VALUE TO SET DESCRIPTION REGISTER NUMBER REGISTER VALUE
Digital output 1 (on/off) Change the state of the digital output number 1 201 1/0
Digital output 2 (on/off) Change the state of the digital output number 2 202 1/0
Switch WiFi (on/off) Allows to switch WiFi on or off 210 1/0
Switch mobile data connection (on/off) Turns mobile data connection on or off 211 1/0
Switch SIM card (SIM1, SIM2, SIM1->SIM2 and SIM2->SIM1) Allows to change SIM card in use, 3 possible options are supported 212 0/1/2
Change APN Allows to change APN 213 APN code
Reboot Reboots the router 220 1

See also

You can find more information on how to use Modbus with RUT routers here: Monitoring via Modbus

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