Spent some real time on this, but am totally stuck - help would be greatly appreciated. I have an astro camera that is controlled by a serial interface and was provided with a small control program (dotnet). The camera and program work fine on my Win7 PC with a Serial-USB connection and I am using Device Monitoring Studio to see the data going to the serial port. I want to migrate the control to Strawberry Perl, so I created the following test program: 
#! C:\perl\bin\perl.exe

use strict;
use warnings;

use Win32::SerialPort ;

my $PortObj = new Win32::SerialPort ("COM1") 
       || die "Can't open port\n";    

  $PortObj->baudrate(9600);
  $PortObj->parity("none");
  $PortObj->databits(8);
  $PortObj->stopbits(1);


$PortObj->write_settings || undef $PortObj;


   my $stt = pack 'H16', 'FF010003005F630A' ;

$PortObj->write($stt);

$PortObj->close || warn "Close Failed!\n";
undef $PortObj;

[download]
The serial monitor shows that my program is initializing the serial port and able to set baud, etc. However, the write command does not cause any serial output at all. I replaced the hex pack string with a simple text string as a test with a \n and a \r, but again, the command does nothing. I set perl.exe to run as administrator but that did not matter. It almost seems as if Windows is preventing me from writing to the serial port in some way. I turned off Windows Firewall but that did not help. Any ideas on how I can debug this one?

In reply to can't write-Win32::SerialPort by franko

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