How to write ASCII code on serial port in Powershell

Question

I am trying to send ASCII code (for ENTER, SPACE, SHIFT, F1, F2, F3 and F4 keys) serially in Powershell

port= new-Object System.IO.Ports.SerialPort COM1,115200,None,8,one
$port.open()

# Carriage return - ENTER 
$port.WriteLine("`r")
Start-Sleep -Milliseconds 500
$port.ReadExisting()

[Byte[]] $request = 13
$port.Write($request)
Start-Sleep -Milliseconds 500

$port.ReadExisting()

$port.Close()

Here in above code, I am sending Carriage Return serially. When I use WriteLine then it works but it fails when I am trying with Write.

Palle Due · Accepted Answer · 2017-10-24 08:43:55Z

1

Often CR+LF work as a command terminator on serial ports, so it probably doesn't pick up what you are doing unless you WriteLine. To send a CR+LF you should try

$port.Write("`r`n")

answered Oct 24, 2017 at 8:43

Palle Due

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4 Comments

Akshay Patole Over a year ago

Thanks. What about these keys (SPACE, SHIFT, F1, F2, F3 and F4 ) ?

Palle Due Over a year ago

Space should be trivial. The others aren't characters, they are keys/scan codes. That's something different. It's up to the receiving end how to encode those, so please check the documentation for whatever device you are communicating with.

Akshay Patole Over a year ago

My requirement is that I want to send keystrokes from Powershell script serially.

Palle Due Over a year ago

I understand your requirement, but you write characters on the the serial port, not scan codes, so there is no way to write F1. Your only hope is that the receiving end has some way to receive key presses, so again: Check the documentation.

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