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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 

C1, C5, C6  0.1 uF bypass capacitors 

C2 

1 uF 35v Tantalum. 

C3 

100 uF 35v electrolytic 

6 1  C4 470 

pF 

7 1  R1 10 k

  

8 1  R2 390

 

D1 

IN5817 Schottky Diode or similar 

BT1 

3 volt Lithium Battery (and holder) 

10 1  U1 MAX233 
11 1  U2 74HC132 
12 

U3 

LM7805 or PT5101 5 volt  regulator 

13 1  LED  
14 

P1 

DB9 Female connector 

15 

J1 

10 pin male PCB header connector 

16 

J2 

Coaxial power connector, female PCB mount 

17 

Cable 

10 pin ribbon cable with female 10 pin female header each end 

18 

sockets 

14 pin & 20 pin IC sockets 

19 

Holder 

Coin cell lithium battery holder 

20 

misc. 

0.1’ prototype PCB, RG-174 with BNC or SMB Female connector 

21 

Case 

Appropriate project case 

Table 3 - Parts List 

QUICK-START GUIDE, MOTOROLA Oncore™ GT - GPS Module for Embedded OEM 

Summary of Contents for Oncore GT

Page 1: ...te status information output either continuously once per second or polled Differential GPS with Motorola binary corrections RTCM SC 104 differential GPS correction input on second comm port Motorola binary protocol at 9600 baud NMEA 0183 output at 4800 baud GGA GLL GSA GSV RMC VTG ZDA sentences Velocity filtering 1PPS output 500 ns accuracy Time To First Fix TTFF 15 s typical TTFF hot with curren...

Page 2: ... PWR 5 VDC regulated 3 GROUND Ground receiver 4 VPP Flash memory programming voltage 5 RTCM IN RTCM input 6 1PPS One pulse per second signal 7 1PPS RTN One pulse per second return 8 TTL TXD Transmit Data 5V logic 9 TTL RXD Receive Data 5V logic 10 TTL RTN Transmit receive return Table 1 10 pin Header Receiver and RS 232 Interface Signals Figure 1 Oncore GPS 10 Pin Connector Pinout ADAPTING THE OSX...

Page 3: ... the constellation of Global Positioning System GPS satellites Each Block II IIA satellite contains two cesium Cs and two rubidium Rb atomic clocks Each Block IIR satellite contains three Rb atomic clocks In addition to helping people on the ground get their navigational fixes the satellites transmit precise time pulses synchronized to the on board atomic clocks A one pulse per second signal outpu...

Page 4: ...equate heatsink for IC2 if using an LM7805 voltage regulator Consider using the PT5101 switching regulator for mobile applications to improve regulator efficiency remove the need for the regulator heatsink and greatly lessen the generation of unwanted heat 2 Before inserting U2 or U3 into their IC sockets verify the integrity of the 5VDC supply and ground connections to U2 and U3 5 VDC Ground 74HC...

Page 5: ...igure 4 Prototype RS232 Clock PC Interface Shown with optional switching regulator SOFTWARE RESOURCES Many GPS applications found on the Internet utilize NEMA communications output protocol between the GPS receiver and PC software The ability to use this common protocol provides for a large number of existing programs that can be utilized by this receiver We recommend you start your functional ver...

Page 6: ...ng and operating the Oncore receiver The software includes diagnostics satellite signal strength readouts satellite positions navigational information plotting and printing data from the receiver and recording and replaying data files NOTE You should first initialize the receiver using the Setup Receiver button No response will be available unless this is done first INFORMATION LINKS ONCORE MANUAL...

Page 7: ... 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 header connector 16 1 J2 Coaxial power connector female PCB mount 17 1 Cable 10 pin ribbon cable with female 10 pin female header each end 18 1 sockets 14 pin 20 pin IC sockets 19 1 Holder Coin cell lithium battery holder 20 1 misc 0 1 prototype PCB RG 174 with BNC or SMB...

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