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For those who prefer C language: #include <stdio.h> #include <stdint.h> #include <string.h> #include <ctype.h> // Calculate Kermit CRC-16 (CCITT polynomial 0x1021) with reversed polynomial 0x8408 uint16_t calculate_kermit_crc(const uint8_t *data, size_t length) { uint16_t crc = 0; for...

It seems that on Ebay you can find what you need: https://www.ebay.com/sch/i.html?item=162942860907&rt=nc&_trksid=p4429486.m145687.l2562&_ssn=psxrepairs

Google translation: In many small industrial installations, we only need: - 20-100 devices - Modbus TCP/RTU - location visualization - alarms - data collection and storage systems. However, most SCADA systems are designed for large enterprises. We have developed a lightweight SCADA architecture...

Sorry, I realized you mean the Modbus Poll program found here: https://www.modbustools.com/download.html I downloaded it, installed and ran two instances of mbpoll.exe program. From each instance I can connect to a different modbus TCP server.

If you mean the program found here: https://www.modbusdriver.com/modpoll.html You need to open two Command Prompt windows and enter the commands in each window: modpoll.exe -m tcp 10.20.30.40 modpoll.exe -m tcp 10.20.30.41

It seems that on Ebay you can find what you need: https://www.ebay.com/sch/i.html?item=162942860907&rt=nc&_trksid=p4429486.m145687.l2562&_ssn=psxrepairs

There is also the guide link: https://plc247.com/invt-goodrive-20-modbus-rtu-via-modbus-poll/ where it says: In order for the INVT GD20 inverter to communicate with Modbus-RTU RS485, we need to set the following parameters: P00.01 = “2” (Motor Control via RS485) P00.06 = “8” (Frequency...

Hi, please watch this video about Modbus Poll & INVT GD20 VFD Modbus-RTU via RS485

Hi, I have found the manual here: https://www.invt.com/uploads/file1/20231009/INVT%20GD27%20Series%20Smart%20VFD%20Manual_V1.1.pdf There is a note on page 142: Note: Some parameters in the preceding table are valid only after they are enabled. For example, for the running or stop operation, you...

Hi, you can convert modbus RTU to MQTT with IndigoSCADA, the SCADA can act as protocol converter: https://sourceforge.net/projects/indigoscada/ The MQTT paylod is encoded as Sparkplug B, not JSON.

Here is a free useful tool: https://sourceforge.net/projects/iedexplorer/

Here is another converter: https://www.adfweb.com/home/products/NMEA2000_Modbus.asp?frompg=nav6_8

Here is a discussion about using WorkstationST OPC DA Server: https://control.com/forums/threads/workstationst-opc-da-server.46510/

Here is another interesting link: https://honeywellprocess.my.site.com/opcsupport/s/article/How-is-my-MatrikonOPC-Server-for-MarkVVI-connecting-to-the-turbine-Ref-KB-513

Hi, please check these two links: https://www.matrikonopc.com/opc-drivers/opc-mark-vi-direct/base-driver-details.aspx https://www.matrikonopc.com/opc-drivers/491/index.aspx

Hi, actually the 0x in 0x0033 address means COIL type, not hexadecimal number. You need to change the code: const uint16_t COIL_ADDRESS = 32; // Address for a single coil The "on-the-wire" address that's actually encoded into the packet is 0-based, so I subtract 1. It should work.

Other two links: https://gateway-iot.com/article/lonworks-to-opc-ua-i00268i1.html https://store.chipkin.com/products/opc-ua-to-lonworks-quickserver-gateway

Here there is another interesting link: https://www.matrikonopc.com/downloads/587/drivers/index.aspx

The NLStartOPC OPC server is probably no more available

The article is dated November 2003. If you click on http://www.newron-system.com/ link it redirects to https://global.abb/