The Master Control series can improve attendance, organize schedules and increase efficiency. Designed for Lathem's wired wall clocks, the LTR-512 series can control virtually any type of secondary clock system. The system can be programmed, via keypad, with four password-protected bell schedules, which may be used in combinations; each capable of executing 64 multi-function "events" (512 aggregate). There are two models, LTR4 (4 circuits) and LTR8 (8 circuits). These master controls can store schedules and controls from any RS232 / RS485 connected computer running Lathem's MasterLink Software, or can be accessed and diagnosed remotely, via modem (Model LTR8-512M).