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I am creating RTU using NModbus.

Installed NModbus package using following command in Package Manager Console

Install-Package NModbus

Now I am creating RTU by following line.

IModbusSerialMaster master = ModbusSerialMaster.CreateRtu(Port);

But I am getting error

'ModbusSerialMaster' is inaccessible due to its protection level

What is the reason and how can I create Modbus RTU to read and wrtite multiple register.

Thanks in advance.

Yes, it's because ModbusSerialMaster is an internal class, as you can see in the source.

Browsing around the code, I suspect you want something like this:

IModbusFactory factory = new ModbusFactory();
IModbusSerialMaster = factory.CreateMaster(transport);

... where transport is something that implements IModbusSerialTransport.

Alternatively, if you don't need an IModbusSerialMaster but an IModbusRtuTransport you'd call CreateRtuTransport:

IModbusFactory factory = new ModbusFactory();
IModbusRtuTransport = factory.CreateRtuTransport(resource);

... where resource is something that implements IStreamResource.

For anything further, I'd probably just clone the source code and browse around it to work out what you can do and what you need.

Indeed. Was just about to post same answer. See github.com/NModbus/NModbus/blob/develop/Samples/Program.cs – spender Jul 7, 2018 at 10:42

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