Based on examples developed using C# VS serial communications, you can communicate upper and lower bit machine

Com\ConnectCom.sln
...\ConnectCom.suo
...\ConnectCom.v12.suo
...\ConnectCom
...\..........\bin
...\..........\...\Debug
...\..........\...\.....\ConnectCom.exe
...\..........\...\.....\ConnectCom.pdb
...\..........\...\.....\ConnectCom.vshost.exe
...\..........\...\.....\ConnectCom.vshost.exe.manifest
...\..........\ConnectCom.csproj
...\..........\Form1.cs
...\..........\Form1.Designer.cs
...\..........\Form1.resx
...\..........\obj
...\..........\...\x86
...\..........\...\...\Debug
...\..........\...\...\.....\ConnectCom.csproj.FileListAbsolute.txt
...\..........\...\...\.....\ConnectCom.csproj.GenerateResource.Cache
...\..........\...\...\.....\ConnectCom.csprojResolveAssemblyReference.cache
...\..........\...\...\.....\ConnectCom.exe
...\..........\...\...\.....\ConnectCom.Form1.resources
...\..........\...\...\.....\ConnectCom.pdb
...\..........\...\...\.....\ConnectCom.Properties.Resources.resources
...\..........\...\...\.....\DesignTimeResolveAssemblyReferences.cache
...\..........\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
...\..........\...\...\.....\TempPE
...\..........\Program.cs
...\..........\Properties
...\..........\..........\AssemblyInfo.cs
...\..........\..........\Resources.Designer.cs
...\..........\..........\Resources.resx
...\..........\..........\Settings.Designer.cs
...\..........\..........\Settings.settings

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