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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 

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 

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  

Summary of Contents for DDC2-RS

Page 1: ...LTR GPS Satellite Synchronizer Installation Setup Guide...

Page 2: ...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 inter...

Page 3: ...ntents 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 Di...

Page 4: ...00ft 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...

Page 5: ...TR 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 LT...

Page 6: ...e 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...

Page 7: ...ng 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 L...

Page 8: ...LTR GPS Installation and Setup Guide C H A P T E R 3 Install the Antenna The antenna must be installed in a position that will have line of sight with three satellites Page 5...

Page 9: ...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 mig...

Page 10: ...TR 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...

Page 11: ...ed antenna to the outside of your building or on the roof s parapet with antenna facing skyward and unblocked by architectural impediments An alternate method is to mount the antenna indoors beneath a...

Page 12: ...12 Master Clock then insert the plug from the wall wart power adapter into its mating jack Plug the power adapter into a nearby AC outlet Verify that the red LED indicator flashes on during initial po...

Page 13: ...to Lathem slave time display devices to be controlled The twisted pair data cable can supply data for 31 max devices located within 4 000 feet Simply daisy chain the twisted pair from slave to slave m...

Page 14: ...Page 11 Fig 2 Connect to LTRx 512 Master Clock 4000 FT MAX 200 FT M ELSE USE AX POWER ADAPTER Fig 3 Connect to LTR 0 or DWA S Sonachron LTR 0 DWA S YELLOW WHITE WHITE YELLOW Fig 4 Connect to DDC Serie...

Page 15: ...in its original carton or equivalent fully insured with shipping charges prepaid Lathem will not assume any responsibility for any loss or damage incurred in shipping 6 WARRANTY DISCLAIMER AND LIMITAT...

Page 16: ...Document USG0045A...

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