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Hello everyone, Here is a Modbus library that I just wrapped to test some industrial Modbus TCP... B4A apps directly to industrial devices (PLCs) over TCP to read and write Modbus data. Your app...
link: Hello Were you able to do anything for the Modbus server part to simulate a Modbus hardware...
link: name. Enjoy... XUI (B4A/B4J) - Future cross-platform libraries: I’ll be releasing a Modbus TCP Server...
link: versions connect via TCP. I've also wrapped and am currently testing 2 more Modbus libraries...

SubName: Modbus CRC-16 is used to ensure data integrity in Modbus RTU (Remote Terminal Unit... string. The following code calculates the Modbus RTU CRC-16 (LSB-first / little-endian), the standard CRC (Cyclic Redundancy Check) used for Modbus frames. Let's use 010107DE000A as an example to calculated it's Modbus CRC-16 checksum value, which is 43 DD. Dim BC As ByteConverter Dim Data() As Byte = BC.HexToBytes("010107DE000A") Log(CalcModbusCRC(Data)) Sub...

ModBus RTU module 'v.2.0 'Slave code © OGmac https://www.b4x.com/android/forum/members/ogmac...* unused) { ::Serial2.begin(b4r_modbus::_port_speed, SERIAL_8N1, b4r_modbus::_rx_gpio, b4r_modbus::_tx_gpio); b4r_modbus::_serialnative2->wrappedStream = &::Serial2; } #End If #Region Functions Private Sub Stream_Error Log("Modbus stream error") End Sub Private Sub Receive....Modbus_NewData(c) 'pass the received data block to needed module Else...

Hi everyone I found this library by @Walter95 and it seems pretty cool. I already did some test with a PLC and I’m able to read something. However, my question is: if I have multiple devices (PLC) is it possible to have them all connected simultaneously or I’ve to circle between them periodically to get data and sensor readings? Thanks in advance...

Hello, I have to calculate the CRC16 of a MODBUS string. Unfortunately I have no idea how can I do...------------------------------------------------- ' returns the MODBUS CRC of the lbuf first bytes of "buf" buffer (buf is a global...
link: sting my modbus data : 010107DE000A ----> crc DD43 ( expand modbus why different I dont know...
link: Mr. taktrashe, I really thank you, your code was very helpful. When I used COM Port Monitor, I wo...
link: I tried BAJ and it is work.. 010107DE000A----> CRC 17373 43DD hex thanks for share...

Hi, All Anyone already tried to implement Master side of Modbus protocol over RS485 interface ? Any shared code (even to be paid) ?...
link: (ReceivedCRC, CalculatedCRC) = 0 Then Main.Modbus_NewData(c) 'pass the received data block...
link: Hi, All Anyone already tried to implement Master side of Modbus protocol over RS485 interface...

cross-platform coding of MODBUS RTU sensor's protocol ? Any links to MODBUS code modules ?...
link: Here is another link for Modbus Library for Arduino. Can experts convert it to B4X? Thanks. https...
link: Hi, There is Modbus Java Library https://github.com/rossmann-engineering/EasyModbusTCP.Java and...
link: No. The code will be too different....

Hello, Has anyone successfully created a project that can communicate (Get & Set) with ModBus RTU I have already seen this post --> https://www.b4x.com/android/forum/threads/modbus-rtu...
link: 90263 Modbus Function Code Support...
link: THanks. BUt how to use with such adapter ? 117759 In this model, the converter automatically sends...
link: Thanks. But how to use with such adapter ? Without direction. 117759117760...

Hello everyone, Here a modbus TCP master library, fully programmed in b4j. This library is asynchronous, by use of the asyncstreams and Callback method. The response is an event, a separate sub...
link: I saw in the The example was made to only read holding registers. The datatype is a conversion of r...
link: The example was made to only read holding registers. The datatype is a conversion of returned holdin...
link: : https://www.b4x.com/android/forum/threads/modbus-tcp-library.144028/#content Kind regards, Coldrestart...

b4r, esp8266, modbus communication (over rs485). Any way to do it? I have a rs485 to ttl adaptor, Cheers...
link: Yes that is correct The MAX485 has an input to allow selection between send and receive...
link: I did ModBus but over rs422. As long as I remember, rs485 must be switched active/passive....
link: This Panasonic manual has a clear description of the Modbus protocol...