Greetings to all newcomers seeking guidance in polling data from a Modbus slave, specifically the Thermo 43i Analyzer, using RS-232. I am facing challenges with the Read_Var function and the Modbus Serial IOScanner. My goal is to retrieve data from holding registers utilizing the modbus command 0x03. Any assistance on this matter would be greatly valued, as tutorials on establishing this communication within the Ecostruxure Expert - Basic program are scarce. Thank you.
If you're looking for information on Modbus RTU, check out this helpful video: https://www.youtube.com/watch?v=OvRD2UvrHjE. Additionally, you can learn more about Modbus and its frequently asked questions at https://www.simplymodbus.ca/FAQ.htm. Once you've grasped the basics, consider setting up the M221 as the master (client) by following the guidelines here: https://damrexelprod.blob.core.windows.net/medias/241f740c-630a-42ce-8195-4ba057a1871e. Don't forget to configure your slave (server) on the Thermo 43i Analyzer, ensuring that the serial communication matches and the unit number is correctly set. I trust this information will be beneficial to you.
-> Verify the serial configuration settings including baud rates, parity, and data bits. -> Look into any communication errors (CommError) or operational errors (OperError) indicated by the READ_VAR function. -> Confirm the device ID (Modbus address) to ensure it matches the specific device being accessed. -> Take note of any block size limitations that may restrict reading certain blocks in a single request. For example, some devices may require reading entire data types rather than specific registers. This can impact the ability to read blocks like 40001&40002 for SO2 concentration or 40007&40008 for LO SO2 concentration in Dual/Auto Range mode. (This information is sourced from the specifications of the Thermo 43i Analyzer).
Hi there! I also struggled with the same issue when I started working with Ecostruxure and Modbus. From what I've learned, you need to ensure your IOScanner setup is correct. Start by selecting the equipment variable you want to read, keep in mind this uses 1-based addressing. When using command 0x03, remember this is a function to read multiple holding registers, so specify how many consecutive registers you want to read. Lastly, always do a Modbus data conversion, as most devices store data in Big Endian format. The Ecostruxure Expert then converts this data according to its own Little Endian format. Hope this helps and hang in there, once you get the hang of it, it'll feel like second nature.
It sounds like you're in the thick of a challenging task! With EcoStruxure, the trick often lies in getting the configuration exactly right. In this case, ensure that your serial port configuration matches the settings of the Thermo 43i. To read from the holding registers, use function code 0x03, and remember that Modbus protocol starts counting from zero, while many devices start from one. So, check if you have the correct start address. Additionally, verify the data type match-up between the Thermo 43i and the Read_Var function in EcoStruxure Basic. Lastly, monitor the communication using a tool like Modbus Poll to track what's happening. Hope this helps!
Hi there! I've worked with the Thermo 43i Analyzer before and it sounds like you're facing a similar challenge to what I did initially. First, check that your device ID, baud rate, stop bit, and parity are set correctly. For the Modbus Serial IOScanner configuration, have you tried function code 03 (Read Holding Registers)? Make sure your first register and number of registers are correct. If all of this is correct, then your issue might be with the variable declaration section, ensure there's one that matches the Modbus map of the Thermo 43i Analyzer. I agree, specifics for this process online can be sparse, but once you get a hang of it, it's quite intuitive.
Hey there! I totally get how tricky it can be to work with Modbus and specific devices like the Thermo 43i. A few things to check: firstly, make sure the baud rate and parity settings on the RS-232 communication match what you have configured in both the analyzer and your software. Also, double-check the address of the holding registers you're trying to read, as it might be slightly different from what you expect. If you haven't already, using a Modbus testing tool can help confirm if the device is responding as expected before diving deeper into your code. Good luck, and I hope you get it working smoothly!
Hey there! It sounds like you're diving into some interesting stuff with the Thermo 43i Analyzer. For the Read_Var function and using Modbus command 0x03, make sure you're addressing the correct registers and that your baud rate settings match between your analyzer and the Modbus client. I’ve found that sometimes the connection issues can be related to cable quality or port settings, so double-check those too. Although tutorials are lacking, I’d recommend reaching out to the manufacturer’s support for specific guidance on Ecostruxure Expert, as they may have insights tailored for your setup. Good luck, and I hope you get it working smoothly!
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Answer: 1. How can I troubleshoot Modbus communication issues with the Thermo 43i Analyzer using RS-232? - To troubleshoot Modbus communication issues with the Thermo 43i Analyzer over RS-232, ensure that the Read_Var function and Modbus Serial IOScanner are configured correctly. Verify that the modbus command 0x03 is being used to retrieve data from holding registers. Seek assistance if tutorials on establishing this communication within the Ecostruxure Expert - Basic program are scarce.
Answer: - The recommended approach for polling data from a Modbus slave such as the Thermo 43i Analyzer is to use the Read_Var function and Modbus command 0x03 to retrieve data from holding registers via RS-232 communication.
Answer: - If tutorials on establishing Modbus communication with the Thermo 43i Analyzer within the Ecostruxure Expert - Basic program are scarce, consider reaching out to relevant forums, community boards, or contacting technical support for assistance and resources.
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