'ModbusSerialMaster'由于其保护级别而无法访问

Question

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.

Answer 1

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.