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.
Contents Welcome ..............................................................................................................1 Package Contents Specifications Configure Settings..............................................................................................3 Time Zone Daylight Savings ASCII Output (optional) Install the Antenna..............................................................................................5 Connect Slave Devices..................................................
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.
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 • Power: • Certificates: 3.25”x 2”x6.6” / 1 lb.
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 SWITCH SWITCH SWITCH SWITCH SWITCH SWITCH SWITCH 1 2 3 4 5 6 7 8 Adjust Plain Text Output for Time Zone, DST Standard / Custom Protocols Enable DST (U.S.
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 3 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.
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.
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.
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.
LTR-GPS Installation and Setup Guide 2. If you have Lathem’s Installation Kit (P/N GPS-INSTALL-TOOLS sold separately), then connect the 9v battery plug to the LTR-GPS’ power jack and the piezo beeper to the exposed shunt pins: Red to (+) and Black to (-). Connect the antenna cable to the LTR-GPS Module. Hold the antenna in its intended mounting position. If the antenna has exposure to the GPS satellites, within three (3) minutes the LED will flicker and the beeper will ‘chirp’ once per second.
LTR-GPS Installation and Setup Guide 5. Mount the LTR-GPS unit to an indoor surface within the 25 foot antenna cable length using four (4) screws and anchors if needed (not supplied). Do not attempt to extend this Cable. 6. Plug the antenna cable into the antenna jack on the LTR-GPS unit and secure the cable in the plastic clamp for strain relief (Fig.1). 7. If the LTR-GPS will not be powered by an LTRx-512 Master Clock, then insert the plug from the wall wart power adapter into its mating jack.
LTR-GPS Installation and Setup Guide CHAPTER 4 Connect Slave Devices 1. Connect a category 3 or 5 cable to the terminal block using a small, flat-blade screwdriver. Connect one of the four twisted-pairs of the cable to the D+/Dterminals on the LTR-GPS unit. This provides synchronization commands to the Lathem slave devices. Connect the other end of the selected pair to the SYNC_IN D+/D- terminals of a Lathem LTRx-512-series master control (Fig.2) or to Lathem DDCx Series digital wall clocks (Fig.4).
LTR-GPS Installation and Setup Guide Fig.2 - Connect to LTRx-512 Master Clock 4 0 00 FT. M AX 2 0 0 FT. M AX; ELSE U SE POWER ADAPTER Fig.3- Connect to LTR-0 or DWA-S (Sonachron) YELLOW WHITE YELLOW WHITE LTR-0 DWA-S Fig.
LTR-GPS Installation and Setup Guide Warranty Limited One-Year Limited Warranty Lathem warrants the hardware products described in this guide against defects in material and workmanship for a period of one year from date of original purchase from Lathem or from an authorized Lathem reseller. The conditions of this warranty and the extent of the responsibility of Lathem Time Corporation (“Lathem”) under this warranty are listed below. 1. 2. 3. 4. 5. 6. 7. 8. 9.
Document # USG0045A
