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QUICK START GUIDE
MOTOROLA Oncore™ GT
GPS Module for Embedded OEM
A rugged and reliable eight-channel receiver, the Oncore™ GT provides position and velocity
data anywhere on Earth, at any time of day, in any weather. It also provides accurate time. A
one-pulse-per-second signal output is synchronized to UTC within a nominal accuracy of five
hundred nanoseconds—ideal for multi-site synchronization and time-distribution applications.
Features
• 8-channel parallel receiver, 8 simul
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ONCORE™ USER’S GUIDE The complete Oncore™ User’s Guide is available in Acrobat .pdf file format at the Motorola GPS products website: http://www.motorola.com/ies/GPS/products/manual.html ELECTRICAL CONNECTIONS The Oncore™ receives electrical power and receives/transmits I/O signals through a 10-pin power & data connector mounted on the Oncore™. Refer to Figure 1 for pin numbering. The following table lists the assigned signal connections of the Oncore™ receiver’s power and data co
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Refer to Figure 2 for the following instructions. 1. Attach the desired antenna connector (typically SMB or BNC female) to one end of the RG-174. 2. On the end of the cable that will connect to the Oncore™ GPS receiver, remove the outside jacket to approximately 0.75” (2 cm) from the end. Carefully separate the braid of the RG-174 to one side. 3. Remove 1/16” (1.5mm) of the insulator from the center conductor and tin with solder. 4. Twist the braid strands together and cover with shrink
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ANTENNA Inexpensive GPS antennas are often available at www.ebay.com for a cost $10.00-$30.00 Like all things on Ebay, your mileage may vary. Be certain the antenna is ACTIVE (versus passive) and designed to be powered by 5 volts DC. Figure 3 - Active Antenna Obtained from EBAY GETTING STARTED - SUGGESTED ONCORE™ RS232 INTERFACE The schematic provided with this guide presents a simple RS-232 interface for use with the Oncore™ GT GPS receiver and a PC or Laptop. This circuit is
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4. Verify voltage levels on all pins of the 10-pin connector prior to connecting the Oncore™ to the RS-232 interface! See figure 1 for pin orientation. 5. Remove power and connect the RS-232 interface to the Oncore™ receiver. Connect an appropriate preamplified GPS antenna to the receiver. IMPORTANT NOTE: Avoid placing the GPS antenna in close proximity to a laptop or PC. This can cause interference with proper signal reception! 6. Apply power to the interface and use VisualGPS soft
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NMEATime (Shareware) - http://www.apollocom.com/NMEATime/ NMEA Time sets the PC clock to the time from the GPS receiver. The software uses GPGGA, GPRMC or GPZDA NEMA sentences to obtain time. Time can be set with additional accuracy by using the 1PPS signal from the GPS receiver and optional interface circuitry. GPSS (FREE/Freeware) - http://www.gpss.co.uk/ Tracking and Mapping Software provided free to individuals to promote business contacts for the vendor. Displayed map resolutions
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Figure 5 - Suggested RS-232 GPS Receiver to Computer and Time Sync Interface Bill of Materials Item Qty Ref Value 1-3 1 C1, C5, C6 0.1 uF bypass capacitors 4 1 C2 1 uF 35v Tantalum. 5 1 C3 100 uF 35v electrolytic 6 1 C4 470 pF 7 1 R1 10 kΩ 8 1 R2 390Ω 8 1 D1 IN5817 Schottky Diode or similar 9 1 BT1 3 volt Lithium Battery (and holder) 10 1 U1 MAX233 11 1 U2 74HC132 12 1 U3 LM7805 or PT5101 5 volt regulator 13 1 LED 14 1 P1 DB9 Female connector 15 1 J1 10 pin male PCB head
