($BlockingFlags, $InBytes, $OutBytes, $LatchErrorFlags) = $PortObj->is_status
        || warn "could not get port status\n";

  $ClearedErrorFlags = $PortObj->reset_error;
        # The API resets errors when reading status, $LatchErrorFlags
        # is all $ErrorFlags since they were last explicitly cleared

  if ($BlockingFlags) { warn "Port is blocked"; }
  if ($BlockingFlags & BM_fCtsHold) { warn "Waiting for CTS"; }
  if ($LatchErrorFlags & CE_FRAME) { warn "Framing Error"; }