PSMDTAG:FAQ: How do I read/write data from a Serial Port?
Writing to a Serial Port
PS> [System.IO.Ports.SerialPort]::getportnames()COM3PS> $port= new-Object System.IO.Ports.SerialPort COM3,9600,None,8,onePS> $port.open()PS> $port.WriteLine("Hello world")PS> $port.Close()Reading from a Serial Port
PS> $port= new-Object System....