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Quick Verdict Read a Trilogy model number in three parts: prefix, series, suffix. DL means keypad only, PDL adds a built-in HID prox reader, ETDL is an exit trim for push bar doors. The series number sets the door type and feature tier: 2700 is the basic cylindrical keypad (100 users, no audit trail), 3200 and 4100 add a 40,000 event audit trail, 3500 is mortise, 1200 and 1300 are narrow stile aluminum door trims, 6100 and 6200 are Networx wirele… Read more