site:perlmonks.org Win32::SerialPort Device::SerialPort $^O
Platform-independent Serial Port code
Accessing Serial port on windows and Linux 
use Perl::OSType qw' is_os_type ';
use if is_os_type('Windows'), qw' Win32::SerialPort ';
use if not is_os_type('Windows'), qw' Device::SerialPort ';

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In reply to Re: mention a non-installed module in script by Anonymous Monk
in thread mention a non-installed module in script by pashanoid

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