Holux GM-210 User Manual

HOLUX

GM-210

GPS Receiver

User’s Guide

May. 28, 2003

HOLUX

8F-11, 26, Tai Yuen St., Chu Pei, Hsin Chu, Taiwan

Phone: [phone] Fax: [phone]

E-Mail: [e-mail] Web: www.holux.com.tw

Technology,.Inc

All Right Reserved

TABLE OF CONTENTS

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1. Introduction

1.1 Overview

1.2 Features

1.3 Technical Specifications

2. Operational Characteristics

2.1 Initialization

2.2 Navigation

3. Hardware Interface

3.1 Dimension

3.2 Interface

3.3 Connector

3.4 Accessories

3.5 Optional Cigarette Adapter

4. USB Driver

4.1 System Requirement

4.2 Installation

4.2 Important

5. Software Interface

5.1 NMEA Transmitted Sentences

5.2 RTCM Received Data

6. Earth Datums

6.1 Earth Datums

6.2 Setting Syntax

7. Ordering Information

7.1 Product Options

7.2 Accessories type

8. Warranty

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1. Introduction

1.1 Overview

The HOLUX GM-210 Smart GPS Receiver is a total solution GPS receiver, designed based on SiRF Star II
Architecture. This 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 unit. It
communicates with other electronic utilities via compatible dual-channel through RS-232 or TTL and saves
critical satellite data by built–in backup memory. With low power consumption, the GM-210 tracks up to 12
satellites at a time, re-acquires satellite signals in 100 ms and updates position data every second.
Trickle-Power allows the unit operates a fraction of the time and Push-to-Fix permits user to have a quick
position fix even though the receiver usually stays off.

1.2 Features

The GM-210 provides a host of features that make it easy for integration and use.

1. SiRF Star II chipset with embedded ARM7TDMI CPU available for customized applications in firmware。

2. High performance receiver tracks up to 12 satellites while providing first fast fix and low power
consumption.

3. Differential capability utilizes real-time RTCM corrections producing 1-5 meter position accuracy.

4. Compact design ideal for applications with minimal space.

5. A rechargeable battery sustains internal clock and memory. The battery is recharged during normal
operation.

6. User initialization is not required.

7. Dual communication channels and user selectable baud rates allow maximum interface capability and
flexibility.

8. Optional communication levels, RS-232 and TTL meet ordinary application and new fashions of connecting
PDA with TTL or RS-232 output.

9. FLASH based program memory: New software revisions upgradeable through serial interface.

10. LED display status: The LED provides users visible positioning status. LED “ON” when power connected
and “BLINKING” when GM-210 got positioned.

11. Built-in WAAS Demodulator.

12. Water proof design for industry standard.

1.3 Technology specifications

1.3.1 Physical Dimension

Single construction integrated antenna/receiver.

Size: 66 (W) x 51 (D) x 23 (H) (cm)

2.60"(W) x 2.00"(D) x 0.88"(H).

1.3.2 Environmental Characteristics

1) Operating temperature: -40oC to +85oC(internal temperature).

2) Storage temperature: -55

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1.3.3 Electrical Characteristics

1) Input voltage: +4.75 ~ 5.5 VDC without accessories.

2) Backup power: 3V Rechargeable Lithium cell battery, up to 500 hours discharge.

1.3.4 Performance

1) Tracks up to 12 satellites.

2) Update rate: 1 second.

3) Acquisition time

Reacquisition 0.1 sec., averaged
Hot start 8 sec., averaged
Warm start 38 sec., averaged

C to +100oC.

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Cold start 45 sec., averaged

4) Position accuracy:
A) Non DGPS (Differential GPS)

Position 5-25 meter CEP without SA
Velocity 0.1 meters/second, without SA
Time 1 microsecond synchronized GPS time

B) DGPS (Differential GPS)

Position 1 to 5 meter, typical

Velocity 0.05 meters/second, typical
C)EGNOS/WAAS/Beacon
Position < 2.2 meters, horizontal 95% of time

< 5 meters, vertical 95% of time

5) Dynamic Conditions:
Altitude 18,000 meters (60,000 feet) max
Velocity 515 meters / second (1000 knots) max
Acceleration 4 G, max
Jerk 20 meters/second, max

1.3.5 Interfaces

1) Dual channel RS-232 or TTL compatible level, with user selectable baud rate (4800-Default, 9600, 19200,

38400).

2) NMEA 0183 Version 2.2 ASCII output (GPGGA, GPGSA, GPGSV, GPRMC, option GPGLL, GPVTG).

3) Real-time Differential Correction input (RTCM SC-104 message types 1,2 and 9).

4) SiRF binary protocol.

2. Operational characteristics

2.1 Initialization

As soon as the initial self-test is complete, the GM-210 begins the process of satellite acquisition and
tracking automatically. Under normal circumstances, it takes approximately 45 seconds to achieve a position fix,
38 seconds if ephemeris data is known. After a position fix has been calculated, information about valid position,
velocity and time is transmitted over the output channel.

The GM-210 utilizes initial data, such as last stored position, date, time and satellite orbital data, to achieve
maximum acquisition performance. If significant inaccuracy exists in the initial data, or the orbital data is
obsolete, it may take more time to achieve a navigation solution. The GM-210 Auto-locate feature is capable of
automatically determining a navigation solution without intervention from the host system. However, acquisition
performance can be improved as the host system initializes the GM-210 in the following situation:

1) Moving further than 500 kilometers.

2) Failure of data storage due to the inactive internal memory battery.

2.2 Navigation

After the acquisition process is complete, the GM-210 sends valid navigation information over output
channels. These data include:

1) Latitude/longitude/altitude

2) Velocity

3) Date/time

4) Error estimates

5) Satellite and receiver status

The GM-210 sets the default of auto-searching for real-time differential corrections in RTCM SC-104
standard format, with the message types 1, 5, or 9. It accomplishes the satellite data to generate a differential
(DGPS) solution. The host system, at its option, may also command the GM-210 to output a position whenever
a differential solution is available.

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3. Hardware interface

3.1 Dimension

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3.2 Hardware Interface

The GM-210 includes an antenna in a unique style waterproof gadget. Simply connect PS-2 female
connector to one of the accessories linking to your notebook PC, PDA or other devices. The one-piece
cigarette adapter allows you to connect GM-210 to your PDAs. Optional color, input voltage and output
connector are listed and described below:

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