Lathem DDC2-RS Istruzioni per il montaggio
LTR-GPS Satellite Synchronizer
Installation &
Setup Guide
THIS EQUIPMENT COMPLIES WITH FCC
CLASS-A REQUIREMENTS
PURSUANT SUBPART J OF PART-15
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two 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.
Copyright © 2004 Lathem Time Corporation. All rights reserved.
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
2nd cable pair, if the distance is less than 200ft; else, power is provided locally by a
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
Page 2
LTR-GPS Installation and Setup Guide
CHAPTER 2
Configure Settings
1. Remove the two Philips-head screws on each end of the unit. Gently flex apart
and lift the cover to expose the circuit board inside.
2. Locate the 8-position DIP switch and hold the unit on a table so that the
switch numbers can be viewed in the following order:
SWITCH
1 SWITCH
2 SWITCH
3 SWITCH
4 SWITCH
5 SWITCH
6 SWITCH
7 SWITCH
8
Adjust
Plain Text
Output for
Time Zone,
DST
Standard /
Custom
Protocols
Enable
DST (U.S.) Time Zone
3. Set Time Zone switches 4-8 for the code representing the offset from GMT
(Greenwich Mean Time) of your location. For installations in the U.S.,
Canada and Mexico, the codes are as follows:
Time Zone Country Offset SWITCH
4 SWITCH
5 SWITCH
6 SWITCH
7 SWITCH
8
Greenwich Mean
Time 0 Hrs. Closed
OPEN OPEN Closed Closed
Atlantic Time CAN -4 Hrs. Closed OPEN Closed Closed Closed
Eastern Time US, CAN,
MEX -5 Hrs. Closed Closed OPEN OPEN OPEN
Central Time US, CAN,
MEX -6 Hrs. Closed Closed OPEN OPEN Closed
Mountain Time US, CAN,
MEX -7 Hrs. Closed Closed OPEN Closed OPEN
Pacific Time US, CAN,
MEX -8 Hrs. Closed Closed OPEN Closed Closed
Alaska US -9 Hrs. Closed Closed Closed OPEN OPEN
Hawaii US -10 Hrs. Closed Closed Closed OPEN Closed
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LTR-GPS Installation and Setup Guide
4. Set Daylight Savings Time switch 3 according to the following table to enable
U.S. rules: 2:00AM first Sunday in April and last Sunday in October:
Daylight
Savings SWITCH
3
Enable OPEN
Disable Closed
5. Switch 2 is used for custom ordered protocols only. This should normally
be left in the OPEN position.
6. If using the RS232 port (requires cable # SAE0370, sold separately) to
transmit a plain text “time stamp”, OPEN switch 1 to select Local Time
transmission. Close switch 8 to transmit GMT.
RS-232
Time Stamp SWITCH
1
Local Time OPEN
G.M.T. Closed
Format for ASCII output: “MM-DD-YYYY HH:MM:SS cr”.
Communications Port Settings: 9600, N, 8, 1
7. Re-align and gently flex apart the cover to replace it over the chassis, making
sure that the circuit board connectors protrude through the appropriate side
cut-outs. Secure the cover with the four (4) screws previously removed.
Page 4
LTR-GPS Installation and Setup Guide
CHAPTER 3
Install the Antenna
The antenna must be installed in a position that will have line of sight with three
satellites.
Page 5
LTR-GPS Installation and Setup Guide
After setting the LTR-GPS switches, then mount the active antenna. Locate
the antenna at the highest elevation possible, with a wide view of
unobstructed, open sky. If possible, avoid mounting the antenna on the north
side of a building, which might block exposure to satellites.
Proper locations for antenna mounting:
Page 6
LTR-GPS Installation and Setup Guide
Avoid these locations when mounting antenna:
1. Using two (2) supplied screws, attach the satellite antenna to the mounting
bracket. Do not over-tighten the screws.
Page 7
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