Lathem DDC2-RS-24, DDC4-RS-24, DDC4-RS, LTR-0, LTR-GPS User Manual

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LTR-GPS Satellite Synchronizer

Installation &

Setup Guide

THIS EQUIPMENT COMPLIES WITH FCC

CLASS-A REQUIREMENTS

This device complies with Part 15 of the FCC Rules. Operation is subject to the following tw o conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

WARNING: Changes or modifications to this product not expressly approved by the party responsible for compliance could void the user’s authority to operate this equipment. NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a business installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

- Reorient or relocate the receiving antenna.

- Increase the separation between the equipment and receiver.

- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

- Consult the dealer or an experienced radio TV technician for help.

This Class A digital apparatus complies with Canadian ICES-003.

Cet appariel numerique de la classe A est conforme a la norme NMB-003 du Canada.

PURSUANT SUBPART J OF PART-15

Document number: USG0045

Revision: A

Contents

Welcome..............................................................................................................1

Package Contents

Specifications

Configure Settings..............................................................................................3

Time Zone Daylight Savings ASCII Output (optional)

Install the Antenna..............................................................................................5

Connect Slave Devices.....................................................................................10

LTRx-512 Master Clocks LTR0 and DWA-S (Sonachron) DDC Series Digital Wall Clocks

Warranty ............................................................................................................12

LTR-GPS Installation and Setup Guide

CHAPTER 1

Welcome

Lathem’s LTR-GPS is a Global Positioning Satellite receiver using 12-channels to access the accurate date and time signal transmitted each second by 24 satellites in geosynchronous orbit around the globe.

The package includes an amplified GPS Antenna, which must be mounted out-doors or beneath a roof sky-light, facing skyward. An integrated cable links the Antenna to the LTR-GPS Receiver Module, which should be mounted in-doors.

The Receiver Module verifies and reformats the received satellite data, and offers multiple synchronization protocol outputs:

The RS-485 Output can directly synchronize up to 31 Lathem time products, up to 4000ft away, over a single twisted-pair from a user-provided Cat-3 or Cat-5 cable. The length of cable and number of synchronized devices can be further increased using Lathem’s “SWIFT485+” RS-485 Converter / Repeater.

An included RS-232 interface provides a periodic “Time Stamp” transmission, “MM-DD-YYYY HH:MM:SS cr”, for use by computing systems having custom software to incorporate accurate date and time records in their applications: 9600, N, 8, 1. Use of this option requires Lathem cable, Part No. SAE0370, to be ordered separately.

Simple DIP-Switch set-up enables the installer to specify Local Time Zone, Daylight Savings Time corrections, and output formats. An LED indicator shows Signal Reception / Protocol Mode.

The LTR-GPS may receive its power from an LTRx-512-series Master Clock, using

cable pair, if the distance is less than 200ft; else, power is provided locally by a

2 9vAC Power Adapter. .

Page 1

LTR-GPS Installation and Setup Guide

The LTR-GPS package includes the following:

• LTR-GPS Satellite Synchronizer

• 115vAC, 2.7w, 50/60Hz Power Adapter

• Active GPS Antenna with 25ft. Cable

• Antenna Mounting Bracket and Hardware

LTR-GPS Specifications:

• Size / Weight 3.25”x 2”x6.6” / 1 lb.

• Power: 6-12vAC/DC, 300mA (max)

• Certificates: FCC Part-15, ICES003

Model numbers of the devices supported by LTR-GPS:

LTR-0 Master Clock DWA-S Sonochron LTR4-512 Master Clock LTR8-512 Master Clock LTR8-512M Master Clock w/ Modem DDC2-RS 2” Digital Wall Clock 115v DDC2-RS-24 2” Digital Wall Clock 24v DDC4-RS 4” Digital Wall Clock 115v DDC4-RS-24 4” Digital Wall Clock 24v

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