A keypad controller is connected via a TTL/R S 485 converter, type AR-829L485 to a maximum of two 16-way relay output modules, type AR-401R016 . The cards/tokens are then programmed into the controller, either via the controller keypad or via a PC. For large numbers of cards/tokens, PC programming is recommended. The controllers each have a host connection that can be connected via an appropriate converter (RS232, USB, GSM or TCP/IP) to a PC.