What do you get from the mode comN: command after you've configured it? 

require 5.003;
use Win32::SerialPort qw( :STAT 0.19 );
use strict;
my $line;
my $deck = openSerial("com3:", 19200, 'none', 8, 1);
# $deck->handshake("xon");
# $deck->buffers(4096,4096);

print `mode com3:`;
...

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In reply to Re: serial port control on Windows by BrowserUk
in thread serial port control on Windows by hydrodog

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