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Functions/Routines: Initialize(Caller As Object,EventName As String, unitId As Byte) CreateConnection(IPaddress As String, Port As Int, Timeout As Int, ReadTime As Int) As ConnectionParams Return the type ConnectionParams that simply contain all informations CreateQuery(Function As Short, StartAddr
link: I used my lib with S7-1200/1500 and ET200SP without problem. If doesn't work the cause is Siemens, from V17 i found a bug on Modbus block that don't c
link: Hi, this should work with a Siemens plc?
link: See #1 I guess it is this part Sub SetQuery() Dim Myquery1 As ModbusQuery = ModbusClient.CreateQuery(1,0,100) Dim Myquery2 As ModbusQuery = M

Come funziona: Da codice si crea Query per indicare la funzione che si vuole eseguire ciclicamente. Prima di registrarla in una lista analizza il parametro "Count" (questo perchè ho notato appunto che posso arrivare a chiedere dati fino a una quantità massima di 125) Adatta la Query ed eventualment
link: Ne so poco di Modbus se non quello che si legge su Wikipedia. Complimenti per la libreria, hai esordito alla grande, mettila nel forum internaziona
link: Urca, very interessante questa A che hardware ti vai a collegare?
link: Si trova gratis, Si esegue su windows ed simula un server modbus TCP e permette di vedere il protocollo che riceve e la sua risposta in merito ed è mo

This Panasonic manual has a clear description of the Modbus protocol
link: Try this library with the Arduino IDE: https://github.com/4-20ma/ModbusMaster If it works then I can help you wrap it.
link: I did ModBus but over rs422. As long as I remember, rs485 must be switched active/passive.
link: I have just had the device delivered today, it will be the weekend before I get time to play with it. Will report back, thanks

Here is another link for Modbus Library for Arduino. Can experts convert it to B4X? Thanks. https://github.com/emelianov/modbus-esp8266
link: No. The code will be too different.
link: Hi, There is Modbus Java Library https://github.com/rossmann-engineering/EasyModbusTCP.Java and https://github.com/kochedykov/jlibmodbus As I unders
link: Hi, All Question about app structure and variables in the project. If i need a server app for B4J (Win or maybe Linux) and FW for B4R controller, all

If your equipments support Modbus TCP, perhaps this can help you.

Hi DonManfred... Modbus RTU is an open serial protocol derived from the Master/Slave architecture originally developed by Modicon (now Schneider Electric). It is a widely accepted serial level protocol due to its ease of use and reliability. Modbus RTU is widely used within Building Management Syst
link: What is MODBUS RTU?
link: Hi B4A Masters... Can anyone here help me to wrapping MODBUS RTU? I have to create an application which will communicate with Bluetooth HC05 @ PLC B

Follow Erel's example (see his post). The modbus device is listenling via TCP/IP to a special port. So try to connect to this port with the example code and send some data.
link: thanks for your reply....but this example not use protocol Modbus TCP on my PLC i have only Modbus TCP...is an international standard industrial prot
link: A few years ago, I implemented the ModBus protocol on PC under VB 6.0 and in C on an ARM microcontroller. From what I remember, you could reuse a lot
link: You will need to implement the protocol yourself. I'm not familiar with Modbus so I cannot say whether it will be simple or not. ByteConverter and Ra

This is your lucky day, here you will find the complete description of a readable MODBUS format specification
link: Assuming that your MODBUS is ASCII, this might both fix up your split packets, and parse out the packets for you: Sub Process_Globals Dim StartO
link: Working on a modbus RTU project on which i send a predefined command of few bytes and in response also few bytes are send by the MODBUS RTU (REMOTE TE
link: That is precisely correct. On the bright side, knowing the problem is half of the solution = Don't Panic! (yet) One day I will get around to writing

90263 Modbus Function Code Support
link: Delta HMI connection with Servo High Torque Arduino(B4R) via Modbus RTU over Rs485 90351 399324537
link: If I understand correctly, your goal is to read the registers of a device. For this purpose, you need a code that is in Master mode, but the above cod
link: Hi @OGmac I'm looking to create a little project that requires ModBus. I've looked at your Code module above and have a question. Can it only 'Set' R

Hello everyone, Here a small quick and dirty implementation of the modbus TCP protocol in B4J as a server / slave. Please note that this is not a complete library! The following limitations are: -Only READING (not writing) of holding registers possible by modbus master(function code 03) from 0-200

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