Build windows offline engineering software for SPM machine with RS 232 communication with Modbus command set

We are manufacturer of UTM machine and testing equipment. we need a testing machine software. we are using PLC and electronic card to operate machine we take all the readings through communication. Load and Displacement. after taking raw data we plot various graph with that data and present report for the same using all the analytical formula and readings. we need to develop best and latest technological software. we have old software for reference and we can start the work with that software modification so you can get clear idea about project. and what we need to do. This project is not one time project we need continues support for same also we can having further project that need same type of software but different application. Requirement: 1. Dedicated timeline for the project. 2. Best knowledge about Dotnet developer WinForms Vb.Net or C# Knowledge or Exposure to - Serial communication - Object Oriented Program 3. Best project cost.