Reading Serial port data continuously in powershell script

Question

I am trying to write a powershell script that sends a command to a serial device and then keeps reading data coming from the device.

[System.IO.Ports.SerialPort]::GetPortNames()
Write-Host "Select Serial Port"
$portName = Read-Host -Prompt 'Input Serial Device Name'
Write-Host "Using $portName..."

$port= new-Object System.IO.Ports.SerialPort $portName, 115200, None, 8, one
$port.ReadTimeout = 1000
$port.Open()

$port.WriteLine("start\n\r")
Start-Sleep -Milliseconds 1000
while ($x = $port.ReadExisting())
{
    Write-Host $x
    Start-Sleep -Milliseconds 300
}
$port.Close()

The above script exits as soon as it receives 1st line from the device. I tried changing the sleep time in the while loop, but the behaviour is the same.

I just tried this the other day and had some weird issues as well. Are you sure the while ($x = $port.ReadExisting()) is behaving as you're expecting? — Daryl Bowman
– Daryl Bowman, Commented Jan 20, 2021 at 12:46
No, I believe that it takes a lot of time to read the bytes in the buffer. I am sure that the device I am talking to responds immediately. — RishabhHardas
– RishabhHardas, Commented Jan 20, 2021 at 14:42
I would suggest while ($port.IsOpen) from here: stackoverflow.com/a/48661245/3718361 — Daryl Bowman
– Daryl Bowman, Commented Jan 20, 2021 at 16:06
while ($port.IsOpen) did not work, but checking it in an if statement and running the script in an infinite loop worked. — RishabhHardas
– RishabhHardas, Commented Jan 21, 2021 at 3:56
You can subscribe to the DataRecieved event which is exposed by the SerialPort class to do this. — bluuf
– bluuf, Commented Jan 21, 2021 at 11:56

RishabhHardas · Accepted Answer · 2021-01-21 04:02:38Z

1

Answering my own question here... The following code worked for me to read continuously from the serial port

Write-Host "Select Serial Port"
$portName = Read-Host -Prompt 'Input Serial Device Name'
Write-Host "Using $portName..."

$port= new-Object System.IO.Ports.SerialPort $portName, 115200, None, 8, one
$port.Open()

Write-Output $port

for(;;)
{
    if ($port.IsOpen)
    {
        $data = $port.ReadLine()
        Write-Output $data
    }
}

answered Jan 21, 2021 at 4:02

RishabhHardas

5251 gold badge7 silver badges27 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Reading Serial port data continuously in powershell script

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related