Qstarz GM-Q772 Manuale utente

Ultra Low Power, High Sensitivity

GPS Smart Receiver

User’s Guide

1. Introduction

1.1 Overview

The GPS Smart Receiver is an ultra low power GPS receiver based on the proven technology found in this 16

channel GPS receivers and NEMERIX chipset solution. The positioning application meets strict needs such as car

navigation, mapping, surveying, security, agriculture and so on. Only clear view of sky and certain power supply

are necessary to the device. With its ultra low power consumption, the smart receiver tracks up to 16 satellites at a

time, re-acquires satellite signals in 1 second (average) and updates position data every second.

1.2 Features

The GPS smart receiver provides a host of features that make it easy for integration and use.

1. Ultra low power design.

2. High performance receiver tracks up to 16 satellites.

3. Compact design ideal for applications with minimal space.

4. A rechargeable battery sustains internal clock and memory. It is recharged during normal operation.

5. User initialization is not required.

6. One full duplex serial communication and user selectable baud rates allow maximum interface capability and

flexibility.

7. Water proof (1 meter) design for all weather.

8. Built-in low noise, high gain active antenna.

2. Hardware Interface

2.1 Dimension

Dimensions: 53.0 (W) x 60.0 (D) x 26.0 (H) (mm)

2.0 (W) x 2.3 (D) x 1.0 (H) (inch)

2.2 Hardware Interface

The smart receiver includes a low noise, high gain active antenna in a unique style waterproof gadget. Simply

connect PS-2 female connector to one of the optional accessories and link to either your notebook PC, PDA or

other devices. The one-piece cigarette adapter allows you to connect smart receiver to your PDAs. Optional

connectors are listed and described below:

Connector

Standard cable: 2 meters with female PS-2 connector.

The GPS Smart Receiver is also equipped with optional connectors.

Pin Assignment of standard PS-2 Din Jack

Accessories

Mini Din Female and PS-2 male connector:

Cable Length: To GPS-6010: 1 meter

RS-232 to PS-2: 45 cm

Mini Din Female connector function definition:

Pin Signal

1 Tx (RS-232)

2 +5VDC

3 Tx (TTL)

4 GND

5 Rx (TTL)

6 Rx (RS-232)

Pin Signal

1 N.C.

2 TX

3 RX

4 N.C.

5 GND

6 N.C.

7 N.C.

8 N.C.

9 N.C.

PS2 composite connector function definition (to PC):

USB connector

The function definition of the A Type USB connector is as follows:

Pin Signal

1 +5VDC

2 N.C.

3 N.C.

4 GND

5 N.C.

6 N.C.

Pin Signal

1 +5VDC

2 D+

3 D-

4 GND

3. USB Driver Installation

3.1 System Requirements

IBM, Pentium or above and other compatible PC; 16 MB and above memory; Windows 98/Me/2000; VGA

Graphic Adapter

3.2 Installation

1. Copy entire <USB> folder from CD-ROM to hard disk.

2. Connect the USB connector to computer. While the computer automatically starts the installation program,

please direct the driver to the <USB> folder.

3. After the installation is complete, go to <Device Manager> and select <Ports (COM & LPT)> to verify if a

virtual COM port <USB to Serial Port> was created.

3.3 Important Notice

Verify the COM port # to start using your own navigating software.

1. Click <Start> menu, select <Settings>, then enter <Control Panel>

2. After entering <Control Panel>, select <System>

3. Select <Device Manager>

4. Find the <Connect Port> and check the Virtual COM Port, which was created by the USB driver. Please note

that the Virtual COM Port number might be different from every computer. Before using navigating software,

please confirm the COM Port numbers created by your computer and provided by your navigation software. They

must be the same Com Port numbers. Otherwise, the navigating software won’t receive the satellite signal for the

un-match COM Port setting.

4. Warranty

The GPS smart receiver is warranted to be free from defects in material and functions for 1 year from the date of

purchase. Any failure of this product within this period under normal conditions will be replaced at no charge to

the customers.

Appendix : Software Specification

NMEA Protocol

The software is capable of supporting the following NMEA message formats

NMEA Message Prefix Format Direction

SGPGGA GPS fix data. Out

SGPGLL Geographic position Latitude / Longitude. Out

SGPGSA GNSS DOP and actives satellites Out

SGPGSV Satellites in view. Out

SGPRMC Recommended minimum specific GNSS data. Out

SGPVTG Velocity and track over ground. Out

SGPZDA Date and time. Out

NMEA Extensions

The software is capable of supporting the following NMEA extensions:

NMEA Message Prefix Format Direction

$PNMRX100 Set serial port parameters. In

$PNMRX101 Navigation initialization In

$PNMRX103 NMEA message rate control In

$PNMRX104 LLA navigation initialization In

$PNMRX106 Set Datum. In

$PNMRX107 NemeriX messages rate control In

$PNMRX108 NMEA message sequence control In

$PNMRX110 Fix Settings In

$PNMRX111 Software Reset In

$PNMRX112 Operating Mode Control In

$PNMRX113 Fix and Extraction control In

$PNMRX300 Almanac data transfer In / Out

$PNMRX301 Ephemeris data transfer. Out

$PNMRX302 Ionospheric correction Out

$PNMRX303 UTC Time Out

$PNMRX304 GPS Constellation Health Status Out

$PNMRX600 SW Version report Out

$PNMRX601 ISP mode In

$PNMRX602 Flash content version report Out

$PNMRX603 Settings Report Out

General NMEA Format

The general NMEA format consists of an ASCII string commencing with a ‘$’ character and

terminating with a <CR><LF> sequence. NMEA standard messages commence with ‘GP’ then a

3-letter message identifier. NemeriX specific messages commence with $PNMRX followed by a 3

digit number. The message header is followed by a comma delimited list of fields optionally

terminated with a checksum consisting of an asterix ‘*’ and a 2 digit hex value representing the

checksum. There is no comma preceding the checksum field. When present, the checksum is

calculated as a bytewise exclusive of the characters between the ‘$’ and ‘*’. As an ASCII

representation, the number of digits in each number will vary depending on the number and

precision, hence the record length will vary. Certain fields may be omitted if they are not used, in

which case the field position is reserved using commas to ensure correct interpretation of

subsequent fields.

The tables below indicate the maximum and minimum widths of the fields to allow for buffer

size allocation.

$GPGGA

This message transfers global positioning system fix data. The $GPGGA message structure is

shown below:

Field Format Min chars Max chars Notes

Message ID $GPGGA 66GGA protocol header.

UTC Time hhmmss.sss 2,2,2.3 2,2,2.3 Fix time to 1ms accuracy.

Latitude float 3,2.4 3,2.4 Degrees * 100 + minutes.

N/S Indicator

char 11N=north or S=south

Longitude float 3,2.4 3,2.4 Degree * 100 + minutes.

E/W

indicator

Char 11E=east or W=west

Position Fix

Indictor

Int 110: Fix not available or invalid.

1: GPS SPS mode. Fix available.

Satellites

Used

Int 22Number of satellites used to calculate fix.

HDOP Float 1.1 3.1 Horizontal Dilution of Precision.

MSL Altitude Float 1.1 5.1 Altitude above mean seal level

Units Char 11M Stands for “meters”.

Geoid

Separation

Int (0) 1 4Separation from Geoid, can be blank.

Units Char 11M Stands for “meters”.

Age of

Differential

Corrections

int (0) 1 5Age in seconds Blank (Null) fields when DGPS is not

used.

Diff

Reference

Corrections

int 440000.

Checksum *xx (0) 3 32 digits.

Message

terminator

<CR> <LF> 22ASCII 13, ASCII 10.

$GPGLL

This message transfers Geographic position, Latitude, Longitude, and time. The $GPGLL

message structure is shown below:

Field Format Min chars Max chars Notes

Message ID $GPGLL 66GLL protocol header.

Latitude Float 1,2.1 3,2.4 Degree * 100 + minutes.

N/S Indicator Char 11N=north or S=south.

Longitude Float 1,2.1 3,2.4 Degree * 100 + minutes.

E/W indicator Character 11E=east or W=west.

UTC Time hhmmss.sss 1,2,2.1 2,2,2.3 Fix time to 1ms accuracy.

Status Char 11A Data Valid.

V Data invalid.

Mode Indicator Char 11A Autonomous

Checksum *xx (0) 3 32 digits.

Message terminator <CR><LF> 22ASCII 13, ASCII 10.

$GPGSA

This message transfers DOP and active satellites information. The $GPGSA message structure

is shown below:

Field Format Min chars

Max chars Notes

Message ID $GPGSA 66GSA protocol header.

Mode Char 11M Manual, forced to operate in selected mode.

A Automatic switching between modes.

Mode Int 111Fix not available.

22D position fix.

33D position fix.

Satellites Used Int 22SV on channel 1.

Satellites Used Int 22SV on channel 2.

…... .. ..

Satellites Used Int 22SV on channel 12.

PDOP Float 1.1 3.1

HDOP Float 1.1 3.1

VDOP Float 1.1 3.1

Checksum *xx 032 digits

Message terminator <CR> <LF> 22ASCII 13, ASCII 10

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