Lathem LTR-512 Series Master Controls are ideal for schools, hospitals, airports and industry. The system can be programmed with eight password-protected bell schedules, each capable of executing 64 multi-function events. All models in the series support Lathem's DDC-Series Digital Clocks. Additionally, The model LTR4-512 has a capacity of four bell circuits, or one clock system with any of over 50 makes and models and two bell circuits. The Model LTR8-512 can support either 8 bell circuits, or one clock system and six bell circuits, or two clock systems any 2 of over 50 makes and models and four bell circuits.
Click here to read an important article on the US Power Grid Experiment as it could cause problems with clock synchronizations.
Here is a list of questions commonly asked about LTR-512 Series Master Controls.
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1.
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What is the basic accuracy of the LTR-512 Master Control?
The accuracy of the LTR-512 Master Control depends on the AC Line. The LTR-512 may be configured for and powered from AC main line of 120 / 240 Volts @ 50/60 Cycles. Time Base Synchronization is normally derived from the frequency of the AC Line, and the selection of 50Hz or 60Hz is automatically detected by the system. During power failures (or when AC Power is shut manually via an internal Toggle Switch), accurate timekeeping is maintained by a Quartz Crystal Time Base supported by Lithium Battery back up. When AC Power is restored, the system's microprocessor calculates the amount of time that secondary clocks were not synchronized and automatically delivers the necessary signals for proper re-synchronization.
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2.
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Can an LTR4-512 Master Control be communicated with through the Masterlink software just as the LTR8-512 Master Control?
The LTR4-512 Master Control is not equipped to communicate with the Masterlink software. The ability to communicate with Masterlink is a sole feature of the LTR8-512/LTR8-512M Master Control.
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3.
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What time should corrections occur from the LTR-512 Master Controls to Analog Wall Clocks?
For most secondary analog wall clocks, the LTR-512 Master Control transmits corrective signals at the top of each hour with a 12-hour correction around 6:00am and 6:00pm. Other secondary clocks receive corrections periodically throughout the course of a 60-minute interval.
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4.
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What are the differences between an LTR4-512 and an LTR8-512 Master Control?
The main differences between an LTR4-512 and an LTR8-512 Master Control are:
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Feature
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LTR4-512
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LTR8-512
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System Clock Correction
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1 Correction Type Plus Lathem DDC4RS Digital Wall Clocks
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Up To 2 Like Or Dissimilar Correction Types Running Simultaneously Plus DDC4RS
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Bell / Zone Control Circuits
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4 With No Clock Correction
2 With 1 Clock Correction
(Bell-Type Only)
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8 With No Clock Correction
6 With 1 Clock Correction
4 With 2 Clock Correction
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For a complete list of feature comparisons, click here for the features of the LTR-512 series Master Clocks.
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5.
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Can the LTR-512 Master Controls synchronize the Lathem 5000E Plus?
The LTR-512 Master Controls can synchronize the Lathem 5000E Plus Electronic time recorder. The 5000EP requires the Optional 30-Volt Plug-In Relay Board installed. The time recorder must also be set with the corrective Signal Option selection set to 59.
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6.
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Can the LTR8-512 Master Control be connected to a network server to get time synchronization without the use of the Masterlink software?
The LTR8-512 Master Controls cannot be connected directly to a network server. Further, the LTR4-512 Master Controls can only be connected to the LTR-GPS to receive time corrections. The LTR8-512 Master Controls can be connected to the LTR-GPS as well as the Masterlink software. Masterlink can be installed on a network server with a Windows Operating system. In order for the LTR8-512 to receive automatic time updates from Masterlink, the Master must be connected to the network with an Ethernet Adapter.
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7.
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Can a third party Ethernet adapter be connected to a the LTR8-512 Master Control for network communications with the Masterlink software?
A third party Ethernet Adapter can be used with the LTR8-512 Master Control to communicate with the Masterlink Software. However, communications with the adapter is not supported by Lathem Technical Support. The Ethernet Adapter configurations must match:
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DEVICE SERVER
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Routing Mode:
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Server
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Transport Protocol:
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TCP
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Local Port:
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1001 ¹
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On-The-Fly Commands:
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Enabled
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Flow Control:
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Off
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Baud Rate:
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9600 BPS
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Parity:
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None
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Data Bits:
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8 Bits
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VIRTUAL SERIAL PORT
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Routing Mode:
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Client
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Destination:
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IP Address :1001 ¹
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Connect Mode:
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On-Data
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Transport Protocol:
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TCP
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On-The-Fly Mode:
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Out-of-Band
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¹
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The IP Address is the address designated by the Network Administrator. The Port Address can vary depending on the Port availability on the network.
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Known third party adapters that have been used by other customers are NETRS2321E and MOXA NPort 5110.
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8.
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Can an LTR-512 Series Master Control Synchronize the time on a DWA-S Sonachron Program Timer?
LTR-512 Series Master Control can synchronize the time on a DWA-S Sonachron Program Timer using the Synch OUT port on the connection ports behind the display. The Sync OUT port is a terminal block pair used to buffer and repeat a received RS-485 sync signal, or transmit synchronization commands to up to an additional 31 RS-485 devices.
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9.
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In reference to contacting the National Institute of Science and Technology for Atomic clock updates, do all LTR-512 Series Master Controls contact NIST?
Only the LTR8-512M Modem clock has the capability of contacting the National Institute of Science and Technology at a specified time to get time updates. LTR4-512 and the LTR8-512 (Non-Modem Master) cannot place the telephone call. All LTR8-512 Master Controls can use Masterlink Software for time updates as needed. All Master Controls can connect to the LTR-GPS to receive time corrections.
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10.
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Can the LTR8-512 Master Control receive time updates from the Masterlink Updater Service if the Master is connected with an RS232/RS485 Connection?
Currently, the Masterlink Updater Service in Masterlink Version 2 will update the LTR8-512 Master's time at a scheduled time when the Master is connected with an Ethernet Adapter. The Masterlink Time Synch synchronizes the computer time with Master Controllers connected with a TCP/IP Connection Type in Masterlink.
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