Top 20 NuGet rtu Packages

Modbus TCP, Modbus UDP and Modbus RTU client/server library for .NET implementations
Small library to connect via Modbus RTU on remote devices.
Using AMWD.Modbus.TCP and AMWD.Modbus.Serial to build proxies.
C# Modbus Tools
NModbus Serial Class Library
a C# implementation of the Modbus protocol. Provides connectivity to Modbus slave compatible devices and applications. Supports serial ASCII and serial RTU protocols.
Tako.Modbus.Client support 1.Tcp 2.RTU
Modbus Core