DC_UNLOCK_LOCK
write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);
write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);
write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);
write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);
write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);
write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);