Win32::SerialPort COM4 doesn"t claim to be a serial port

I have a problem with my serial device on Windows, whereas it works fine on Linux.


It works fine on Linux:
use Device::SerialPort qw( :PARAM :STAT 0.07 );
$PortObj = new Device::SerialPort ($PortName, $quiet, $lockfile) || die "Can't open $PortName: $!\n$file_exists"; }



I get an error on Windows Vista:
use Win32::SerialPort qw( :PARAM :STAT 0.19 );
$PortObj = new Win32::SerialPort ($PortName, $quiet, $lockfile) || die "Can't open $PortName: $!\n$file_exists"; }

D:\tmp>.\dvm2000v0.1.11.pl --device="COM4"
=> doesn't claim to be a serial port
at D:\tmp\dvm2000v0.1.11.pl line 404
Can't open COM4: No such file or directory


Same error when using "\\.\COM4" as device name.
When I unplug the cable, the error message "doesn't claim to be a serial port" is not printed.

About the serial device:
dmesg: SPCP8x5 ttyUSB0: SPCP8x5 converter
USB ID: 04fc:0201 Sunplus Technology Co., Ltd

What is going wrong? What can I check to fix this issue?

For more details, refer to http://wirespeed.xs4all.nl/mediawiki/index.php/Velleman_DVM2 000_PCLink

Thnx!

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