DC_UNLOCK_UNLOCK
write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);