Section 10 – Access Control10-19Construction ModeThe system is capable of operating in a Construction mode in which building contractors can be given aspecial coded card or key for gaining access before the system is fully operational. This mode is in effectif the ACIU is not communicating with the control unit.Checking Operation and Using Construction Key/CardThe Construction key or card has a unique code that has been embedded in a special location in thememory of the ACIU. The ACIU will look for the construction code only if it loses communication withthe control unit.Once the ACIU battery has been charged, the Construction key/card can be used to check the operationof the electric door strike or other releasing mechanism, enabling adjustments to be made wherenecessary.Remember, to use the Construction key/card, the control unit must be powered down or the ACIUcommunication wires must be disconnected from the RS-485 bus.After making all required adjustments and powering up the system, you can enroll the Constructionkey/card into the system and give it to construction people for use until the system is turned over. Thenthe Construction key/card can be deleted.Where a Keylok is involved, a small terminal is provided just above the LED to enable emergencyoperation in the event that AC power is out or the control unit is down for an extended period. Applyinga + 12-volt potential to this terminal from a battery will power the ACIU and allow a Construction keyto be used to unlock the door.Maintenance of the Access Control Interface UnitDorado and other mag-stripe readers and cards may experience wear, necessitating periodic readermaintenance and eventual card replacement. Consult the manufacturer's/vendor's literature at the endof this supplement for details. Make sure all readers are tested periodically for proper operation.Supervision of ACIUThe ACIU is supervised for three conditions:• A low-battery condition − If the battery voltage falls below 12.0 volts, a low-battery supervisorysignal will be generated. The voltage is checked every time the door strike is powered.• An open in the wiring between the electric strike or Keylok mechanism and the ACIU.• A tamper condition − If the tamper is used and the cover is removed.In either case, the operating panel will display a trouble message (shown below), that indicates the RS-485 Communication Unit number of the ACIU.< ? TROUBLE DV 003Card Reader< OPEN< Quit Prev >In the event that a low battery or an open is detected, a DT (device trouble) signal will be sent to theCCC. If a tamper is detected, a tamper signal will be sent. Both signals will include the number thatidentifies the address of the associated ACIU.
