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 eight 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).

Two models available: LTR4 (4 circuits) and LTR8 (8 circuits)
Keypad and text/menu display allows convenient programming changes to schedules.
Dual password level grants appropriate control to installer/administrators and general users.
Eight 64-event schedules can be activated individually, or in groups, allowing for up to 512 active events.
Multi-function events each include the day(s) of the week, the effected circuit(s), the time and duration of the event.
Special schedules for holidays and automatic schedule changes programmed in advance of their activation dates.
Automatic Daylight Savings Time adjustments, supporting international requirements.
Available with surface, semi-flush, and 19″ rack mount hardware and capable of drop-ceiling/raised floor installation with optional cable.
Schedules and timekeeping functions are retained during power failures; proprietary algorithms allow for rapid, automatic clock recovery.
MasterLink desktop/laptop computer management software (LTR8-512)
One year warranty

Surface: 7″H x 13″W x 4.52″D
Semi-flush: 7″H x 13″W x 1.12″
Rack: 5.2″H x 18.7″W x 7″D (option)
Weight: 14 lbs.
Input Voltage: 115 / 240 VAC +/- 10%
Input Frequency: 50/60Hz
Input Power: 30 Watts Max
Program Memory Retention: 10 year – Lithium Battery Backup
Battery: 10 Year Lithium Battery Backup
Operating Temperature: 32° – 175° F (0°C – 79.4°C)
Operating Humidity 5% – 85% RH, non-condensing
Circuits: 24 VDC to 240 VAC, 10Amp, Double pole relay contacts (plug-in)
Time Base: Calibrated Quartz Osc. w/ Lithium Back-Up
Time Base Accuracy: +/- 2 minutes per year
System Clock Correction: Over 50 clock correction schemes plus RS485 / Up to 2 correction types running simultaneously plus RS485
System Clock Circuits: 0, 2 or 4 plus RS485
Bell Circuits:
4 with no clock correction (LTR4)
2 with 1 clock correction (LTR4)
8 with no clock correction (LTR8)
6 with 1 clock correction (LTR8)
4 with 2 clock correction (LTR8)
Security: 2 levels using 6-digit pass code
Number of Schedules: 8
Events per Schedule: 64 multi-function
Event Scheduling:
Day of Week or “Holiday”
Time On
Signal Duration: 0 – 99 seconds
Holidays: Up to 16 pre-programmed
Daylight Savings: Automatic, perpetual based on Country Code
Time Display Format: 12 hour or 24 hour
Display: LCD with back lighting
Auto-correct after power failure: Yes
Atomic clock synchronization: Yes. Requires optional modem and MasterLink software (LTR8)
Run multiple schedules at one time: Yes
Pre-programmed schedule changes: Yes. Up to 16 scheduled changes.

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