511DCIEKIT. This PAC 511 Dci expansion kit contains enables the management of an additional door as part of the same Access Central IP network when used with the 511DCiSKIT. This kit comprises of the following: PAC 511 DCi in metal enclosure with 3A PSU GS3 Mullion HF reader. Enables management of an additional door as part of an existing Access Central IP network. To be used with the PAC 511 DCI Single Door Access Control Starter Kit. Expansion kit to add 1 extra door.