EasyModbusTCP/UDP/RTU .NET Activity
Modbus TCP, UDP and Modbus RTU client/server library
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Activity for EasyModbusTCP/UDP/RTU .NET
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Daniel J Palmer posted a comment on discussion General Discussion
Hello, I am using the demo project and I am getting errors reading any registers above 4095. I know the variables in the program can handle the higher numbers, but the program crashes when I try 4096 or above. I assume I am doing something wrong, but not sure what. Any help is appreciated. Thanks !
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anon-user-c modified a comment on discussion General Discussion
Hi all I'm running into an error when I try to read over 120 coils. The first 120 read fine but for some reason cannot read over 120. This code is inside a polling timer: The error highlights the input 121 line of code then i get: System.IndexOutOfRangeException: 'Index was outside the bounds of the array.' ModbusClient PLC = new ModbusClient(plcIP, 502); PLC.Connect(); bool[] inputs = PLC.ReadCoils(0, 20); bool[] inputs2 =PLC.ReadCoils(120, 20); //==========input18 FEEDBACK===========================================...
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Hi all I'm running into an error when I try to read over 120 coils. The first 120 read fine but for some reason cannot read over 120. This code is inside a polling timer: The error highlights the input 121 line of code then i get: System.IndexOutOfRangeException: 'Index was outside the bounds of the array.' ModbusClient PLC = new ModbusClient(plcIP, 502); PLC.Connect(); bool[] inputs = PortalPLC.ReadCoils(0, 20); bool[] inputs2 = PortalPLC.ReadCoils(120, 20); //==========input18 FEEDBACK===========================================...
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Jeff Hunter posted a comment on a wiki page
Quick question. Is there a way to read a specific address? I am seeing an address of 10001, 10002, 10003, etc. Can I check one of those specific addresses for a value by address? Sorry, I am new to programming and PLCs.
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Michele Amati posted a comment on a wiki page
You need to install the System.IO.Ports Nudget in the project. In this way I solved the problem.
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Stanley Michel Polanco Recarey posted a comment on discussion General Discussion
Greetings dear, I am trying to read a floating record and I can't. I have only been able to write using the following code: modbus.WriteMultipleRegisters(1060,ModbusClient.ConvertFloatToRegisters(float,ModbusClient.RegisterOrder.LowHigh));
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Scott Mongrain posted a comment on discussion General Discussion
Yes. Connections (and thus, clients) are cheap; abandon them at the earliest sign of trouble. That means using Try...Catch where you should toss the connection in the Catch block as basically the only action (don't try to resolve anything, it's useless and more effort than it's worth), abandoning it after any latency longer than you'd like, also after a malformed response, etc. Basically just constantly remake clients/connections (they're more or less one and the same) and everything works perfectly....
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abx qwq posted a comment on discussion General Discussion
Hi Scott, I have the same issue. Did you resolve this ?
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Nikoloz Qvrivishvili posted a comment on discussion General Discussion
Good morning! Please have a look at: https://control.com/forums/threads/homebrewed-software-to-communicate-with-measuring-device-via-modbus-tcp.49152/page-2 The matters you’re interrogating right over there. N. Qv. Воскресенье, 6 марта 2022, 13:58 +04:00 от Thomas ztomaj@users.sourceforge.net: Good morning, I am looking for a solution to get full modbus package (not just a value received from the remote device). The best would be to store each byte from the package in the array. For now I found a...
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Thomas posted a comment on discussion General Discussion
Good morning, I am looking for a solution to get full modbus package (not just a value received from the remote device). The best would be to store each byte from the package in the array. For now I found a C code in SRE EasyModbusAdvancedClient and converted to the VB.net. Seems sendData and receiveData are the arrays w with Modbus packages, but I can't get the value of the specific index. For now I change the package to string (as in original code) and use Substring to get exact "byte", but this...
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Good morning! Please have a look at: https://control.com/forums/threads/homebrewed-software-to-communicate-with-measuring-device-via-modbus-tcp.49152/page-2 The matters you’re interrogating right over there. N. Qv. Суббота, 5 марта 2022, 15:16 +04:00 от "Tomasz Zieliński" ztomaj@users.sourceforge.net: Hello, Is there any way to get a full modbus frame (RTU) received from slave? I can't find any solution in codesamples or in the forum. Anyone can share their code? Thanks a lot. Retrieving modbus frame...
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Hello, Is there any way to get a full modbus frame (RTU) received from slave? I can't find any solution in codesamples or in the forum. Anyone can share their code? Thanks a lot.
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Ame555 posted a comment on discussion General Discussion
Dear community, I am learning to use EasyModbus and I am starting with an example that I found in your web page, however reviewing the documentation I could not find an option that allows me to print the register address that I am reading, for example I want to save in a database the following information: Registration Address, Registration Value. Does anyone know how to get this value? Maybe my question is too basic? thank you for your kind attention.
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Hans H posted a comment on discussion General Discussion
I cannot find any example where I can read a 32-bit float register with or without transformation between hex and decimal.
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I cannot find any Java client example where I can connect to a Modbus server with several Modbus units (different Modbus ID's)?
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yasin posted a comment on discussion General Discussion
numericUpDown1.Value = (decimal) ModbusClient.ConvertRegistersToFloat(modbusClient.ReadHoldingRegisters(5, 2));//float // numericUpDown2.Value = (decimal) ModbusClient.ConvertRegistersToFloat(modbusClient.ReadHoldingRegisters(9, 2));//float // numericUpDown6.Value = ModbusClient.ConvertRegistersToInt(modbusClient.ReadHoldingRegisters(13, 2));//dword // numericUpDown3.Value = ModbusClient.ConvertRegistersToInt(modbusClient.ReadHoldingRegisters(15, 2));//dword // numericUpDown7.Value = (decimal) ModbusClient.ConvertRegistersToDouble(modbusClient.ReadHoldingRegisters(20,...
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Alex Chan posted a comment on discussion General Discussion
I have this similar problem using VS2019 vb.net. This is due to the case-sensitive in the holding register variable and class. Unless EasyModbus modify the variable name to some different, else, VB.net is not supported.
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I have tried to use EasyModbus Master mode. When I try to update my holding register with the value 987005.3, the first 16bit register value = 18800 and second 16 bit register = 63445. However, since the holding register for EasyModbus only support Short (16 bit signed int), the 2nd register value was changes to -2091. Is there any way to support unsigned int16 for the register? Otherwise, how do you allow us to update the holding register with the float value 987005.3?
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olddebris posted a comment on a wiki page
I have tried using the EasyModbus library to build a TCP Modbus client. I added the .dll in the dependencies of my project and I can use the library and compile my solution but when I try to run my manual test I get an error telling me that the loader can't find a library : System.IO.Ports version 4.0.3.3. Here is the detailed error message: System.IO.FileNotFoundException HResult=0x80070002 Message=Could not load file or assembly 'System.IO.Ports, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'....
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You need to install the number 3. The library.
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Is your library doing this It gives this error every 1 or 2 hours Also, I don't understand the license completely, is this license paid?
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Abdul Hayee posted a comment on discussion General Discussion
Hi everyone I am using easyModbus file for RTU communication. It is easy to use and I find it very helpful. I want to know that 0x13 function code is supported by this file. If yes then how to access this function? Kindly tell me about this
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ali posted a comment on a wiki page
ı static int[] ConvertFloatToTwoRegisters(float floatValue) Converts float value into two registers - can be used to write float values to server Example to write float value into server: modbusClient.WriteMultipleRegisters(24, EasyModbus.ModbusClient.ConvertFloatToTwoRegisters((float)1.22)); ı use example but ı have error message modbuscliend does not definition for ConvertFloatToTwoRegisters Can You Help me ali alikalkan@users.sourceforge.net, 26 Eyl 2021 Paz, 12:26 tarihinde şunu yazdı: ı need...
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ı need floating write register how am I can
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Easy modbus program does not work while plc program is online SocketException: A blocking operation, a WSACancelBlockingCall
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EasyModbus.Exceptions.QuantityInvalidException: 'quantity invalid
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When I run this code, it crashes after a while, why? quantity invalid public async void Start() { await Task.Delay(10).ContinueWith(_ => { for (int ferdi = 0; ferdi < 32; ferdi++) { modbusClient.WriteSingleCoil(ferdi, true); Thread.Sleep(5); modbusClient.WriteSingleCoil(ferdi, false); } for (int j = 31; j > 0; j--) { modbusClient.WriteSingleCoil(j, true); Thread.Sleep(5); modbusClient.WriteSingleCoil(j, false); } Start(); });
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hello decimal value can w e write c#?
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decimal value can we write
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decimal value?you can write
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peki decimal?
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so why can't we write decimal value? float values are rounded
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Good evening, I suggest first establish communication with use of: Modbus Poll software. After get your own software fit to do the same. Best wishes. Вторник, 20 апреля 2021, 17:25 +03:00 от Alfonso Collado alfonsocollado@users.sourceforge.net: Hi, I'm using the EasyModbus for comunicate with a device using RS485. (9600 baud) in a Visual Studio application The problem is that this device needs 8 seconds in order to send an answer, and before these the system give me the exception "No Response from...
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Alfonso Collado posted a comment on discussion General Discussion
Hi, I'm using the EasyModbus for comunicate with a device using RS485. (9600 baud) in a Visual Studio application The problem is that this device needs 8 seconds in order to send an answer, and before these the system give me the exception "No Response from Modbus Slave". Is not a cuestion about ConnectionTimeout, is like about how to change the time that the system wait before consider an error. I was reading about the EasyModbus porperties, but I can't found any to adjust it. Please, if any can...
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Rossmann Engineering posted a comment on discussion General Discussion
please share some code and make sure that your device is reachable and responding properly.
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Anonymous posted a comment on discussion General Discussion
Getting this error " Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond." When trying to read input registers from multiple modbus device at the scan rate of every one second.
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The correct way would be to change the Property "UnitIdentifier" before every request, according to the slave you want to read/write data.
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Anonymous posted a comment on discussion General Discussion
Hi, I'm trying out the library in C# for my Modbus RTU application. I'm trying to write single registers to multiple clients. They are all on the RS485 bus, but with different addresses. In the example code I can set the address of the client by using .UnitIdentifier = <id> before connecting to the COM port. Is there a way to include the address parameter in the .WriteSingleRegister()? So that I can communicate with multiple slaves on the same COMport? Thanks!</id>
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There is a static Method in the ModbusClient class; public static string ConvertRegistersToString(int[] registers, int offset, int stringLength) public static int[] ConvertStringToRegisters(string stringToConvert)
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Anonymous posted a comment on discussion General Discussion
How to sent string Modbus TCP/TP .what should i do ?
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EasyModbusTCP/UDP/RTU .NET released /V5.6/EasyModbusLibrary for .NET (DLL).zip
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Usually there is no difference reading Holding Registers or Input Registers, Perhaps the Register address is not 30001? Sometimes the "3" Prefix indecates that it refers to the "Input Register" Block. It might be address "1"?
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Usually there is no difference reading Holding Registers or Input Registers, Perhaps the Register address is not 30001? Sometimes the "3" Prefix indecates that it refers to the "Input Register" Block.
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Hi, could you explain what you are trying to do? Stefan
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Anonymous posted a comment on discussion General Discussion
How do you want to use the Library?
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Cheers to everyone! 1. I downloaded Easy Modbus TCP.NET Package v5.5 archive. 2. Then I extracted 'EasyModbus.dll' and copied it to C:\Windows\System32 3. I also copied 'EasyModbus.dll' to C:\Windoows\SysWOW64 4. I typed 'cmd' then I run Console as Admin and prompt a command: 5. C:\Windows\system32>regsvr32 EasyModbus.dll 6. Please have a look in attachment. 7. It seems that this dll doesn't have an entry point. Can anyone kindly tell me, Is this normal, or I am making some mistake while trying to...
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Cheers to respected community, I intended to make some software enabling me to communicate Iskra MC750 device with use of ModbusTCP. And therefore I downloaded the EasyModbusTCP.NET package v5.5. When files extracted it appeared to have three archives inclusion: 1. Easy Modbus Server Simulator(NET. Version) 2. Easy Modbus Client (.NET Version) 3. Easy Modbus Library for .NET(DLL). Can anyone kindly tell me which of abovementioned I have to install? Is there some guidance available concerning installation...
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Alpay Toprak posted a comment on discussion General Discussion
When I tried to read datas at analog inputs which have 30001-300.. address is not working. What should I do for reading datas at these adresses. My c# code working very well I can read holding register values but I could not read analog inputs.
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Cheers to everybody, In order to make some kind of homebrewed software to communicate via Modbus TCP Iskra MC devices, using Visual C.net or VB.net, I was suggested to download "Easy Modbus TCP.NET Package v 5.5". It includes archives: 1. Easy Modbus Server Simulator(.NET version) 2. Easy Modbus Client (.NET version) 3. Easy Modbus Library for .NET(DLL). Can anyone kindly tell me, which of them do I need to install? Best wishes.
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Anonymous posted a comment on discussion General Discussion
Totally agree!.... For commercial use , no harm in paying a small amount to the developers. Developers very much deserve it.
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Anonymous posted a comment on discussion General Discussion
Suggest Keep MIT as well as a Paid option through Patreon or something like that.
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I understand, the license is meanwhile updated ti MIT, but on the other hand for commercial applations doesn't it makes sense to pay a small amount for a commercial product (Since you also wan't to get pad for your work)?
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Anonymous posted a comment on discussion General Discussion
I'm afraid we too had to look else where for a solution because of the licence in place.
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Anonymous posted a comment on discussion General Discussion
Same problem with the licence. GPL forced me to change to different library. In testing this is still proven to be the most stable java based library. Can this library or just the Modbus/TCP subset be purchased with less restrictive or even proprietary licence?
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Anonymous posted a comment on discussion General Discussion
Same problem here.. GPL makes it useless for any industrial application..
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Anonymous posted a comment on discussion General Discussion
[This is continuation of my above post with the Win 7 and Win10 examples] Or you can call the constructor on a Win7machine like so $MBClient = New-Object -TypeName EasyModbus.ModbusClient -ArgumentList "192.168.40.112",502. Both my Win10 and Win7 machines have all the same .NET libraries installed , but produce different behaviors.
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Anonymous posted a comment on discussion General Discussion
Yeah this issue is persistent. In order to get it to work with powershell on windows 7 you have to initialize the client as $MBClient = New-Object -TypeName EasyModbus.ModbusClient and then set the IP Address and Port from the propeties , otherwise on a Win10 machine you can just do $MBClient = [EasyModbus.ModbusClient]::new("192.168.40.112", 502)
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Anonymous posted a comment on discussion General Discussion
I'm interested in the result of this, because I might have similar experience: A lot CRC errors with a Win7 machine but on the scope the data looks fine and with other tools (like ModbusPoll) I don't get any errors.
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Anonymous posted a comment on discussion General Discussion
I recently was encountering a similar problem while using an RS232 to RS485 adapter. Sporatic CRC check failures would occur during long tests due to a leading zero value. I suggest re-assigning COM1 to another COM port as Windows 7 32-bit uses COM1 as a debug port for some reason (Windows 7 64-bit does not). You can also enable the FIFO buffers and move the sliders up to the maximum. Lastly, make sure you're running EasyModbus 2.9 or newer as I think there may have been an issue in version 2.8....
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Anonymous posted a comment on discussion General Discussion
Hello ; I have similar problem Dim mdBusclient As ModbusClient Dim BB As Boolean() Private Sub ToolStripButton2_Click(sender As Object, e As EventArgs) Handles ToolStripButton2.Click MesajKutusu.Items.Add("Sinyal gönder") 'FTChipID.ChipID.GetNumDevices() Try mdBusclient = New ModbusClient("COM4") mdBusclient.Connect() MesajKutusu.Items.Add("Bağlantı yapıldı başarılı") Catch MesajKutusu.Items.Add("Bağlantı yapılamadı") Throw End End Try BB = {True, False, False} MesajKutusu.Items.Add("Açılışa geldi")...
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Just choose "quantity" 1. Then it returns an Array with the "length" 1
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Anonymous posted a comment on discussion General Discussion
Hello, can I read or write single 16 bit register?The function int[] ReadInputRegisters(int startingAddress, int quantity) return an array 32bit, but if I want to read a single 16bit register how can I do?
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Not trick, just click on the coil you want to change
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Anonymous posted a comment on discussion General Discussion
Hello. I recentliy found this great Modbus-Client Example which i would like to use for testing. It works really great, i have only one problem, I can't set the Prepare Coils" Value to "TRUE". When I set the mousepointer into the field, i can't type or change the value. Is there a trick to it? best regards, Christian
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Unfortunatelly I don't have any VB.NET examples
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Anonymous posted a comment on discussion General Discussion
Also having this problem...
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Anonymous posted a comment on discussion General Discussion
Hi, I trying to build a modbus server using VB.Net 2015 express edition. I have created a new project and added the easymodbus.dll file as a reference. I have one line of code in the form1_load sub to create an event handler for the coilsChanged event: AddHandler EasyModbus.ModbusServer.coilsChanged, AddressOf CoilsChangedHandler But I get the following error: 'coilChanged' is ambigueous because multiple kinds of members thith this name exist in class 'ModbusServer' What am I doing wrong ?? Are there...
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Anonymous posted a comment on discussion General Discussion
I am having trouble formatting this method, specifically filling in the register order. Could you help? /// <summary> /// Converts two ModbusRegisters to Float, Registers can by swapped /// </summary> /// <param name="registers">Two Register values received from Modbus /// <param name="registerOrder">Desired Word Order (Low Register first or High Register first /// <returns>Connected float value</returns> public static float ConvertRegistersToFloat(int[] registers, RegisterOrder registerOrder) {...
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Hi, I din't try that, but if you write a register to the Server listening on port 3001 it should update the Registers of that Server instance and call the appropriate callback function, the same with the Server instance listening on port 3002
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Anonymous posted a comment on discussion General Discussion
Hi, I want to write a c# application using EasyModbusTCP lib. My target is to have multiple modbus server on same pc using different tcp port( ex. 3001 for mbServer[0] and 3002 for mbServer[1]). I want to use the code posted by @Alex (https://stackoverflow.com/questions/57984190/issue-while-writing-modbusclient-and-modbusserver-together/62361088?noredirect=1#comment110292993_62361088) but I have a problem to identify witch server is allocated the Ser_HoldingRegistersChanged method. When change the...
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That is NOT a Modbus Issue, thats simple C# programming and you'll find some anwers already in this duscussion (or ask google). A Modbus Register contains 16 Bit and is handles is signed value -32768 - 32768. If you need values between 0 - 65535, you have to convert.
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Anonymous posted a comment on discussion General Discussion
I have attempted a few things but am not sure this is what I need. Should the standard method int[] ReadHoldingRegisters(int startingAddress, int quantity) be able to read int values above 32767? It appears tha the other methods combine multiple registers to create either the double, or float. I was able to get the FLoat conversion to work fine on registers that use IEEE -754 , but in this case I just want to read one register that has a value that reaches 65,000 plus. I feel I am just using the...
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I think the answer is pretty obvious, your Modbus Device is not anwering the request. (I think yo u did not forget to connect first?)
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Anonymous posted a comment on discussion General Discussion
I also have a similar issue. I am trying to read input registers, but have no idea how i shoud do it. I am doing like this: Console.WriteLine("Value of Input Reg #10: " + modbusClient.ReadInputRegisters(9, 1)[0].ToString()); But it is giving me the same error: No response from Modbus Slave.
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Hi I don't fully understand your code. But you definitelly have to check the mapping of your device, that has to match with your Modbus reading. It sounds to me that your trying to read a Holding Register to determine the state of a digital input, or did I missunderstand something?
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Anonymous posted a comment on discussion General Discussion
Hi, I am trying to use your DLL in a VB.net application to read and write via modbus to a Schnieder distributed IO device. I have used your sample modbusTCP client app and it successfully returns the input status by reading the holding registers. I call the ReadHoldingRegisters function (modbusclient.ReadHoldingRegisters(5392, 16) in this instance to read address 45392 which is a 16 input module) and I only ever get back an array of all 0s. My test code is as follows: Public Class Form1 Public Shared...
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Confirmed, I am actually familar with ELAU controllers, and the EasyModbusTCP library can definitely communicate with an ELAU controller.
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Anonymous posted a comment on discussion General Discussion
Dear team, Thanks for all the great effort put into this project so far. I would be glad if you could confirm if this library can be used to read data from Schneider Elau C400 PLCs over ethernet? Thanks & Regards, Nouman
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Tom Randles posted a comment on discussion General Discussion
the size of the Array "registerValues" is "1"? Yes I think you connect before to the Device? Yes. It turns out I needed to write to all of the device's configuration registers (8 in total) in one FC16 command. All working now. Thanks!
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Hi Tom, the size of the Array "registerValues" is "1"? I think you connect before to the Device? If both yes, then there is no reason why it shouldn't wok.
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Hi, I am integrating to a Fan Coil using Modbus RTU, a TCP to Modbus gateway device and EasyModbus TCP.Net software. I am able to read register values so the basic integration is working fine. However, I am not able to write to the Fan Coil to set the "supervisor active" mode. This is required before any subsequent writes to the system. registerValues[0] = 1; try { modbusClient.WriteMultipleRegisters(1103, registerValues); } I am in touch with the vendor, but would appreciate any pointers to diagnose...
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Double - Please check a few Posts below
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I had this error and discovered that it occured when the IP connection timeout period on the Asper Mod-Eth gateway device had expired.
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fizzle1967 posted a comment on discussion General Discussion
I am trying to read a 16 Bit word from a Modbus device. When the following reaches 32767 it rolls over to negative. Is there a way I can read larger values from a single register? int[] readHoldingRegisters = modbusClient.ReadHoldingRegisters(0, 8); label2.Text = readHoldingRegisters[7].ToString();
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My bad, found answer here: https://sourceforge.net/p/easymodbustcp/discussion/general/thread/356895f3/#70bd
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Hi, I am not 100% sure if I fully understand. FC16 is a write command from the Client to the Server. To read Register use FC03 (Read Holding Registers).
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waston_lw posted a comment on discussion General Discussion
Hello, I have a question for consult， I make a c# Project based on easymodbus version 5.5. Used for slave communication. It is normal to read and write separately with MODBUS client. However, when I communicate with the DCS of Zhejiang University . Reading instruction is normal, writing instruction is abnormal. But It is normal for me to use mbslave.exe Software instead of my project and Zhejiang University industrial control DCS for continuous reading and writing. How can I solve this problem?
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int signed =-18536; int unsigned = 0; unchecked { unsigned = (UInt16)(Int16)signed; }
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Anonymous posted a comment on discussion General Discussion
I am reading 42500 value using readinputregister method, but i get -18536 . please help .. how can i read values above 32767 as values above 32767 are being read negative..
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Hi Alessandro, yes I am meanwhile aware of that issue. Since I don't use VB, I never had that issue. Yes, I would appreciate if you would submit a commit for this.
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Alessandro Mandelli posted a comment on discussion General Discussion
As per subject, since EasyModbus does not support modbusRTU over TCP, is it possible to use UDP IPendpoint to be set to tcp gateway of RTU slaves?
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In ModbusServer, there exist both object coils and class Coils (same for other 3 types of Modbus objects). Setting the coils array in VB.net (which doesn't differentiate between uppercase and lowercase) fails as there is a ambiguity between the object and the class from which the object is instantiated. I solved by renaming the 4 classes. I can submit a commit for this.
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Jens Vanhoof posted a comment on discussion General Discussion
Hi, I have been using the .NET library for a few days now and have had no problems with it until now, I hope you can help me out. I'm writing in C# and I have 2 slaves (ID 1 and ID 2) connected on the bus. Until now I changed the parameter .UnitIdentifier before writing to a register, writing the data in order to the 2 slaves but I have now realised that, in my application, I could actually write the same data to the 2 slaves at the same time. This would free up the bus sooner since no response is...
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I am not sure if your Omron PLC proviedes Modbus Slave funktionalities, but you are using the constructor for Modbus-TCP if you try to connect via serial Port that can only be Modbus-RTU. Your USB to serial converter should add a COM-Port. If you are using Modbus-RTU you should use EasyModbus.ModbusClient modbusClient = new EasyModbus.ModbusClient("Com4");
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Arun Mahajan posted a comment on discussion General Discussion
I am trying to read an Omron PLC from a C# program. I have connected Omron PLC with my laptop using USB cable. In the program while I am trying to make an object I am failed to understand what value should I provide in the connect method: EasyModbus.ModbusClient modbusClient = new EasyModbus.ModbusClient("Com4", 502); instead of Com4 it MUST need to provide some value so that it can understand that it is a USB port which needs to be connected. Please note that this is a direct USB cable no convetor....
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I have connected my Omron PLC with my laptop using a USB serial port converter. It gets connected successfully and I am able to read all values of port. Now while I am trying to read the inputregistor it provides me the following error: System.TimeoutException HResult=0x80131505 Message=No Response from Modbus Slave Source=EasyModbus StackTrace: at EasyModbus.ModbusClient.ReadHoldingRegisters(Int32 startingAddress, Int32 quantity) at EasyModbus.ModbusClient.ReadHoldingRegisters(Int32 startingAddress,...
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