net10.0 
namespace System.IO.Ports
{
    public class SerialPort : Component
    {
        public SerialPort(string portName, int baudRate, Parity parity);
    }
}
nuget.org
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Reference this API
.NET
8.09.010.0
.NET Framework
2.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net10.0
Assembly

System.IO.Ports , Version=10.0.0.1, PublicKeyToken=cc7b13ffcd2ddd51

Referencing

Your project needs a package reference to System.IO.Ports.

Package System.IO.Ports (10.0.1) net10.0
Platform Restrictions

This API is supported on any platform except for these:

  • Browser
  • iOS
  • tvOS
  • Built-in API
  • Package-provided API