MODBUS COMMUNICATION

Dear all,

ModBus communication using ARDUINO UNO and mach3 CNC Analyzer. For this we used simple ModBus slave library. Here are the screenshots for easy understanding and configuration of mach3.

Download and install the mach 3 CNC Analyzer.

Open your session profile in mach3mill.

Open the ports and pins window by clicking on the config tab on the left top corner of the mach3 window. In this select the port enable, modBus input output support and also the ModBus plug-in support after that click on the OK tab.

After this select setup serial modBus in the cofig’s function next to config tab. Here enable the config tab by clicking on it and give the names as shown in the below figure. PORT number is the one which your Arduino is connected, address modBus is the address of the variable which you are going to read, direction input output is the IO for modBus, ensure that you have mentioned the correct baud rate and 8-2-N: 1 start bit, 8 data bits, 2 stop bits.

 Now click on the test modBus tab on the right top corner of the window. You can see another window.

Give the correct slave id(other than zero), starting address, total number of register you need to access from the Arduino and click on the open port now it will display no error message in the status bar. Click on the read tab to read the register values.

Now open the brain editor window in the operator tab. A new window will open when you click on the + tab. In this select the modBus and configure the parameters as shown in the below image. Similarly add other input, save the file with extension of .brn and close the window

In a dialogue box it will ask whether you want to terminate the label or not.

Open the brain control window in the operator tab

Click on all brains tab it will display the previously saved files and enable the correct file by selecting on it. Finally click on the view brain tab.