To make it work, write:

my $sReturn = $sFuncRscIoCheck->Call($sConnectionHandle,
                                  $sSessionHandle,
                                  $sCheckAll,<br>
                                  $sReplyBuffer,
                                  $sReplySize) & 0xFF;

print "My Return is : $sReturn\n";
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The return value will be set to 17 as expected.