Revision as of 05:06, 16 December 2022

Introduction

Modbus enables communication among many devices connected to the same network, for example, a system that measures temperature and humidity and communicates the results to a computer. Modbus is often used to connect a supervisory computer with a remote terminal unit (RTU) in supervisory control and data acquisition (SCADA) systems.

Many of the data types are named from its use in driving relays: a single-bit physical output is called a coil, and a single-bit physical input is called a discrete input or a contact.

Modbus Service is a Windows/Linux system service for WISE Agent to read sensor data from Modbus device or write data into Modbus device. After sensor data are acquired, WISE Agent will upload the data to the WISE-PaaS Cloud.

Features

EdgeSense Modbus-Master aims to collect data from Modbus Slave.

Feature:

• Support connection with multiple Modbus slave.
• Support access both Modbus TCP and RTU in one service.
• Support individual read interval by connection.
• Configurable sensor alias.
• Support byte swap.
• Support Modbus Coil, Descrete input, Input register & Holding register data.
• Support maximal 10 links, 5 devices for each link, and 10 sensors for each device.
• Default data report interval: 100ms, configable sensor R/W interval, default is 1000ms. 

How to

Installation

Windows:

1. Download Modbus-Master for Windows from Release Table.

2. Double click the installer to launch the installer to install it to the machine.

Debian:

1. Download Modbus-Master for Debian from Release Table.

2. Launch the installer to install it to the machine.

sudo ./device-modbus-master-3.0.1-Debian_9.9-rk3399.run

Configuration

How to config Model

Step 1. Go to "Plug-ins" / Plugin Config to select Modbus-Master Plug-in

Setp 2. From Modbus-Master Configuration, open Model Management tab, click "+" to add new Model.

Setp 3. Input Model name and Description for new Model.

Step 4. Click "+" to add Sensor - Input Sensor Name - Select Address Space, Access mode, Data Type, Data Format and input Address, Data Length, Minimal/Maximal Value for new sensor's attributes. - Input below timing attributes. . Period (second) . Delay (ms, range: 0~1000ms) . Retry

• Click "Save" button to save the new sensor.

Step 5. Repeat Step 4 to add another sensor.

modbus_config_XLSJYyn.png

modbus_config_qsox6hM.png

modbus_config_qpMUDCj.png

Modbus config bQUoHri.png

Step 6. Click "Save" button to save the new sensors.

modbus_config_oXbCCsc.png

Step 5. Click "Save" button to save the new model.

modbus_config_kXoLU5M.png

How to config Link

Step 1. From Modbus-Master Configuration, open Link Management tab, click "+" to add a new Link.

modbus_config_Sz3fL8f.png

Step 2. Input Link Name, Link Type for the new Link.

for Modbus-TCP link, set parameters: - IP - Port

for Modbus-RTU link, set parameters: - COM port - Baudrate - Data bits - Stop bits - Parity mode

Click "+" icon to add a new device.

modbus_config_Dvkgjc2.png

Step 3. Input Device Name, Station Id and select Model Profile for the new device. Model Profile should be added by upper Model Management steps.

Click "Save" button to save the new device.

modbus_config_CkZoH3H.png

Step 4. Click "Save" button to save the new link.

modbus_config_jGIBhIa.png

Step 5. Click "Apply" button to apply the new link.

modbus_config_YudsLa4.png

Apply new settings Successfully

modbus_config_7rvJoo5.png

Step 6. Go to Plugin List and select Modbus-Master plugin, the new sensor will be shown in this page

modbus_config_Sys1ZZH.png

How to import plugin settings

Step 1. Click Import button from Modbus-Master Configuration

modbus_config_T6zjSoj.png

Step 2. Select target file you like to import

modbus_config_ZYeZTw5.png

Import successful

modbus_config_k3N8BQO.png

Step 3. Click APPLY to use imported configuration

modbus_config_JTgo9CB.png

Apply new settings Successfully

modbus_config_WZGsmXR.png

How to export plugin settings

Step 1. Click Export button from Modbus-Master Configuration

modbus_config_tH3zFyI.png

Step 2. Explore the exported file

modbus_config_IU83MxX.png

Use case

Connect and upload data for Modbus Temperature and Humidity sensor

Use Modsim32 to simulate a modbus TCP device with a temperature sensor and a humidity sensor, config Modbus-Master to read these two sensors and upload iEdge cloud.

Config Modbus simulator

Step1. Open Modbus Simulator: Launch ModSim32 and click "New" in program menu to create a new simulator page.

Step2. Set parameter as below:

• Device Id: 1
• Address: 0001
• Length: 2
• Modbus Point Type: INPUT REGISTER

Step3. Enable Auto Simulation:

• Double click on the sensor address 30001
• Click "Auto Simulation"

Step4. Set simulation parameters:

• Check "Enable"
• Simulation Type: Increment
• Change Interval (secs): 5
• Step VAlue: 1
• Low Limit: 10
• High Limit: 20

Step5. Do the same step for the address 30002 and set simulation parameter as below:

• Simulation Type: Decrement
• Change Interval (secs): 5
• Step VAlue: 1
• Low Limit: 60
• High Limit: 80

Step6. Set Connection to Modbus/TCP Svr:

• Click Connection
• Click Modbus/TCP Svr to simulate Modbus TCP connection

Step7. Config Modbus-Master

• Config Modbus-Master plugin as upper steps to complete the settings.

Release

This is an overview that displays Modbus Service versions and some stats and numbers for each release.

Above files are available at local server, please paste file's url in File Explorer to copy file. (How to access to EOSSFS file server )