Qualcomm GSP-1620 User Manual

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This manual is based on the

GSP-1620 Satellite Data Modem.

Software or hardware changes may

have occurred after this printing.

QUALCOMM reserves the right to make changes in

hardware, software, and technical and product specifications

without prior notice.

QUALCOMM Incorporated

5775 Morehouse Drive

San Diego, CA. 92121-1714

U.S.A.

This technology is controlled by the United States Government. Diversion contrary to U.S. law prohibited.

QUALCOMM® is a registered trademark of QUALCOMM Incorporated.

Globalstar is a trademark of Loral QUALCOMM Satellite Services, Inc.

QUALCOMM Globalstar GSP-1620 Satellite Data Modem Integrator’s Reference Manual

80-99208-1, Rev. D

April 17, 2001

TABLE OF CONTENTS

Who Should Use This Manual .................................................................. xvii

How This Manual Is Organized............................................................... xviii

Notational Conventions ............................................................................. xix

Abbreviations and Acronyms...................................................................... xx

Related Documentation............................................................................ xxiii

Cautions and Warnings ........................................................................... xxiv

Getting Started ........................................................................................1-1

GSP-1620 Modem Overview ...................................................................... 1-2

Typical Modem SCADA Applications ......................................1-3

Conceptual Overview ................................................................1-6

What’s in the Modem Integrator’s Kit?..................................................... 1-7

What You May Need in Addition to the Kit ............................1-9

Quick Bench Set-Up ...............................................................................2-1

Connecting Hardware Components........................................................... 2-2

A Quick Tour of the Modem .....................................................2-2

Connecting the Modem Cables .................................................2-4

Connecting the Modem Interface Cable ............................2-4

Connecting Antenna Cables ...............................................2-6

Connecting the Diagnostic Cable .......................................2-7

Connecting and Mounting the Antenna ..................................2-9

Mounting the Modem .............................................................2-11

Grounding the System ............................................................2-11

Providing Power to the Modem ............................................................... 2-12

Setting Up HyperTerminal to Talk to the Modem ................................. 2-15

Testing the Modem Setup ......................................................2-16

Resetting or Powering Off the Modem ..................................2-18

Where to Go Next ..................................................................................... 2-20

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Service-Programming Modems ...........................................................3-1

UTPST Overview........................................................................................ 3-2

Using the UTPST ....................................................................................... 3-2

Re-programming Default Parameters....................................................... 3-4

Bulk-Programming Modems...................................................................... 3-7

Upgrading Modem Software...................................................................... 3-7

Making Simple Data Calls ....................................................................4-1

Checking Modem Status............................................................................ 4-1

Making Simple Packet Data Calls ............................................................ 4-3

Making a Call from the Data Port ...........................................4-4

Entering Online-Command Mode ............................................4-5

Developing Modem Applications ........................................................5-1

Recommended Development Tools............................................................ 5-2

SCADA Application Components.............................................................. 5-2

Packet/Asynchronous Data Overview ....................................................... 5-4

Modem Application Scenarios ................................................................... 5-5

Working with Modem Features................................................................. 5-7

Using Data and Control Ports .................................................5-7

Data and Control Port Configurations ..............................5-8

Port Arbitration Behavior ..................................................5-9

AT Command Processing Modes ......................................5-12

Port(s) Affected by AT Commands ...................................5-13

Port Activation (DTR) Changes during Operation .........5-15

Port Use During Power On and Power Off ......................5-16

Globalstar Satellite Service ...................................................5-16

Short Messaging Service (SMS) .............................................5-17

SMS Alerts ........................................................................5-17

SMS Message Field Information ......................................5-18

SMS AT Commands ..........................................................5-18

Using SMS for Mobile-Terminated Calls ........................5-18

Globalstar Service Alerts .......................................................5-19

Service Status Message ..........................................................5-20

Position Location Determination ...........................................5-21

Using Packet Data ................................................................................... 5-21

Data Rate and Throughput ....................................................5-22

Networking Software and PPP Sessions ...............................5-22

Interoperability with Different Operating Systems .......5-22

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IP Addressing for the GSP-1620 Modem ...............................5-23

Dynamic IP Addressing ....................................................5-23

Fixed IP Addressing .........................................................5-24

Finding IP Addresses ........................................................5-24

Virtual Private Network Service .....................................5-24

Dormant Mode Service ...........................................................5-25

Mobile-Originated Packet Data Calls ....................................5-27

Mobile-Terminated Packet Data Calls ..................................5-27

Answering Calls Using the Data Port Only ....................5-28

Answering Calls Using the Data and Control Ports .......5-29

Roaming and Packet Data Service ........................................5-29

Using Asynchronous Data ....................................................................... 5-30

Data Rate and Throughput ....................................................5-32

Mobile-Originated Asynchronous Data Calls ........................5-32

Mobile-Terminated Asynchronous Data Calls ......................5-33

Accessing Packet Data Over an Asynchronous

Connection ...............................................................................5-34

Roaming and Asynchronous Data Service ............................5-35

Typical Modem Initialization Strings ..................................................... 5-36

AT Command Reference ........................................................................6-1

AT Command Quick Reference Tables...................................................... 6-2

AT Commands Overview ........................................................................... 6-7

Command Alphabet ..................................................................6-7

Case Sensitivity ........................................................................6-7

Command Line Format ............................................................6-7

Command Syntax .....................................................................6-8

Basic AT Commands .................................................................................. 6-8

Results Returned ......................................................................6-9

Command Echo (E) ...................................................................6-9

Get Info (I) .................................................................................6-9

Monitor Speaker Loudness (L) ...............................................6-10

Monitor Speaker Mode (M) ....................................................6-11

Select Pulse Dialing (P) ..........................................................6-11

Result Code Suppression (Q) ..................................................6-12

Select Tone Dialing (T) ...........................................................6-13

DCE Response Format (V) .....................................................6-13

Result Code Selection Command (X) .....................................6-14

Reset to Default Configuration (Z) ........................................6-15

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DCE Received Line Signal Detector Behavior (&C) .............6-16

DTE Data Terminal Ready Behavior (&D) ...........................6-16

Set to Factory-Defined Configuration (&F) ...........................6-17

Basic Action Commands .......................................................................... 6-18

Answer Incoming Call (A) ......................................................6-18

Repeat Last Command (A/) ....................................................6-19

Dial (D) ....................................................................................6-20

Hook Control (H) ....................................................................6-22

Return to Online Data Mode (O) ...........................................6-23

Basic S-Registers...................................................................................... 6-24

Results Returned ....................................................................6-24

Automatic Answer (S0) ...........................................................6-25

Command Line Termination Character (S3) ........................6-25

Response Formatting Character (S4) ....................................6-26

Command Line Editing Character (S5) .................................6-27

Pause Before Blind Dialing Time (S6) ...................................6-27

Connection Completion Timeout (S7) ....................................6-28

Comma Dial Modifier Time (S8) ............................................6-29

Carrier Detect Threshold Timeout (S9) .................................6-29

Carrier Loss to Disconnect Timeout (S10) ............................6-30

DTMF Tone Duration and Spacing (S11) ..............................6-31

Globalstar-Specific S-Register Extensions.............................................. 6-31

Silent Retry Timeout (S777) ..................................................6-31

Extended Configuration AT Commands ................................................. 6-32

Set Forward MUX Option (+CMUX) .....................................6-32

Set Rm Interface Protocol (+CRM) ........................................6-33

Get Modem User Terminal ESN (+GSN) ..............................6-34

Set Character Framing (+ICF) ..............................................6-35

Set Local Flow Control (+IFC) ...............................................6-36

Set Rm Interface Command Baud Rate (+IPR) ....................6-38

Online-Command Mode Commands........................................................ 6-40

Change from Online to Online-Command Mode (+++) .........6-40

Asynchronous Data through Gateway IWF Commands ........................ 6-41

Set Remote Config String (+CFG) .........................................6-41

Data Compression Control Command (+DS) ........................6-42

Error Control Selection Command (+ES) ..............................6-45

Modulation Selection Command (+MS) .................................6-47

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Dormant Mode Commands ...................................................................... 6-48

Set Dormant Mode Timeout Value (+CTA) ...........................6-49

Packet No Dial ($QCPKND) ..................................................6-50

SMS Commands ....................................................................................... 6-51

SMS Move/Delete ($QCSMSM) ..............................................6-51

SMS Print ($QCSMSP) ..........................................................6-52

SMS Lock ($QCSMSL) ...........................................................6-56

SMS Alert ($QCSMSA) ..........................................................6-57

SMS Info ($QCSMSI) .............................................................6-58

Error Log Services Commands ................................................................ 6-59

Retrieve Error Log ($QCERR) ...............................................6-59

Clear Error Log ($QCCLR) ....................................................6-60

Service Status Commands....................................................................... 6-61

Service Alert ($QCSA) ............................................................6-61

Service Status ($QCSTATUS) ................................................6-62

Special Calls and Services Commands.................................................... 6-64

Time of Day ($QCTOD) ..........................................................6-64

Position Location Service ($QCPLS) .....................................6-66

Markov Statistics ($QCMSTATS) ..........................................6-68

Set Mode ($QCMODE) ...........................................................6-69

Protocol Stack Modification Commands ................................................. 6-70

TCP Stack Changes ($QCTCP) ..............................................6-70

Use Van Jacobsen Header Compression ($QCVJ) ................6-73

Integrating GSP-1620 Modems

into OEM Products .................................................................................7-1

Integrating Modems into Products............................................................ 7-2

Modem Mechanical Description ...............................................7-3

Modem Board Layout .........................................................7-3

Modem Dimensions and Weight ........................................7-6

Modem Antenna Connectors ....................................................7-6

Data and Control Ports ............................................................7-6

DTR/DSR Signal and Power On/Off ..................................7-7

Changing Data and Control Port Configuration ...............7-8

Control Port Signals ...........................................................7-8

Data Port Signals ................................................................7-9

DB-25 Data and Control Port Pinouts ...............................7-9

Diagnostic Port .......................................................................7-12

Diagnostic Port Pinouts ....................................................7-13

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DC Power ................................................................................7-15

Surge Protection ...............................................................7-16

EMI Filtering ....................................................................7-16

Power Consumption ..........................................................7-16

Power-On ...........................................................................7-17

Power-Off ..........................................................................7-18

Hard Power Reset .............................................................7-18

Grounding ...............................................................................7-18

Modem Mounting Guidelines .................................................7-19

QUALCOMM Mark on OEM Enclosures ........................7-20

Integrated Product Regulatory Labeling .........................7-21

Mounting Antennas On-Site.................................................................... 7-22

Modem Antenna Specifications ..............................................7-22

Antenna Dimensions and Weight ....................................7-23

Antenna Depiction ............................................................7-23

Antenna Cable Specifications ................................................7-25

Calculating Antenna Cable Length .......................................7-27

Mounting Antennas at the Field Site ....................................7-27

Finding a Good Antenna Location ...................................7-27

Securing Antenna Cables .................................................7-28

Mounting and Sealing Antennas on Flat Surfaces .........7-28

Mounting and Sealing Antennas on Poles ......................7-29

Mounting Multiple Antennas ...........................................7-29

Environmental Specifications.................................................................. 7-30

GSP-1620 Modem Environments ...........................................7-30

Temperature/Humidity ..........................................................7-30

Operational .......................................................................7-30

Non-Operational ...............................................................7-30

Thermal Radiation .................................................................7-31

Altitude ...................................................................................7-32

Operational .......................................................................7-32

Non-operational ................................................................7-32

Vibration .................................................................................7-32

Operational - Random ......................................................7-32

Non-Operational - Random ..............................................7-32

Operational - Sinusoidal ...................................................7-32

Non-Operational - Sinusoidal ..........................................7-32

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Mechanical Shock ...................................................................7-34

Operational .......................................................................7-34

Non-Operational ...............................................................7-34

Acoustic Noise .........................................................................7-34

Digital Data Connector Durability ........................................7-34

Applied Forces ...................................................................7-34

Mating cycles .....................................................................7-34

RF Connector Durability ........................................................7-35

Materials .................................................................................7-35

Shipping ..................................................................................7-35

Dielectric Resonator Antenna (DRA) Environments.............................. 7-35

Temperature/Humidity ..........................................................7-35

Operational .......................................................................7-35

Non-Operational ...............................................................7-36

Thermal Radiation ..................................................................7-36

Icing/Freezing Rain/Snow ......................................................7-37

Altitude ....................................................................................7-37

Operational .......................................................................7-37

Non-Operational ...............................................................7-37

Vibration .................................................................................7-37

Operational - Random ......................................................7-37

Non-Operational - Random ..............................................7-37

Mechanical Shock ...................................................................7-38

Operational .......................................................................7-38

Non-Operational ...............................................................7-38

RF Connector Durability ........................................................7-39

Materials .................................................................................7-39

Shipping ..................................................................................7-39

Troubleshooting ......................................................................................8-1

Globalstar Background ........................................................................A-1

Space Segment........................................................................................... A-2

Ground Segment........................................................................................ A-2

Coverage .................................................................................................... A-2

Carriers...................................................................................................... A-4

Distributors and OEMs for User Terminals ............................................ A-5

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RF Certification/Restrictions .............................................................B-1

Certification............................................................................................... B-1

Federal Communications Commission (FCC) ........................B-2

European R&TTE Directive 1999/5/EC .................................. B-2

RF Restrictions.......................................................................................... B-3

Radio Astronomy Zones ........................................................... B-3

GPS Interference Elimination ................................................ B-3

Radio Frequency Exposure Restrictions .................................................. B-3

Electronic Device Restrictions.................................................................. B-4

Pacemakers .............................................................................. B-4

Hearing Aids ............................................................................ B-5

Other Medical Devices ............................................................. B-5

Warranty ..................................................................................................C-1

Product Support ....................................................................................D-1

QUALCOMM Globalstar Customer Service ............................................ D-1

Technical Support Information ............................................... D-1

Order Fulfillment Information ...............................................D-2

Website Information ................................................................D-3

Contacting QUALCOMM Customer Service ..........................D-3

Contact information ........................................................... D-4

Specification Summary ........................................................................ E-1

x 80-99208-1 Rev. D

LIST OF FIGURES

Figure 1-1. Typical Modem SCADA Application Using

Packet Data ...................................................................1-4

Figure 1-2. Typical Modem SCADA Application Using

Asynchronous Data .......................................................1-5

Figure 1-3. Conceptual Diagram of GSP-1620 Modem ..................1-6

Figure 2-1. Simplified Top View of GSP-1620 Modem ...................2-3

Figure 2-2. Modem Interface Cable Bridle .....................................2-4

Figure 2-3. Modem Diagnostic Cable ..............................................2-8

Figure 2-4. Antenna Base Showing Connectors ...........................2-10

Figure 5-1. DCE - DTE Application Components ...........................5-3

Figure 5-2. DTE-to-DCE Rm Interface ...........................................5-7

Figure 5-3. Asynchronous Data Call Components .......................5-31

Figure 7-1. GSP-1620 Modem Board Layout (Top View) ...............7-4

Figure 7-2. GSP-1620 Modem Board Layout

(Side/ Bottom Views) .....................................................7-5

Figure 7-3. QUALCOMM Mark for OEM Enclosures ..................7-21

Figure 7-4. DRA Side View ............................................................7-22

Figure 7-5. DRA View Showing Connectors .................................7-23

Figure 7-6. DRA Top and Side Views ............................................7-24

Figure 7-7. DRA Bottom View and Mounting Hole Locations .....7-25

Figure 7-8. GSP-1620 Modem Temperature/Humidity

Envelope ......................................................................7-31

Figure 7-9. GSP-1620 Modem Random Vibration Spectra ...........7-33

Figure 7-10. DRA Temperature/Humidity Envelope .....................7-36

Figure 7-11. DRA Random Vibration Spectrum .............................7-38

Figure A-1. Globalstar Coverage Availability ................................ A-3

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xii 80-99208 -1 Rev. D

LIST OF TABLES

Table 1-1. Typical GSP-1620 Modem Applications ......................1-3

Table 1-2. Checklist of Modem Integrator’s Kit Components ......1-8

Table 2-1. DTR Switch Positions ...................................................2-8

Table 3-1. Service Programming Parameters You Must Set ......3-5

Table 3-2. Bulk Service-Programming Options ............................3-7

Table 5-1. Packet vs. Asynchronous Data ...................................5-4

Table 5-2. Port Signal Lines ..........................................................5-8

Table 5-3. Port Arbitration Behavior .........................................5-10

Table 5-4. Port(s) Affected by AT Commands ............................5-14

Table 5-5. Sample Typical Modem Initialization Strings .........5-36

Table 6-1. Operational AT Commands .........................................6-2

Table 6-2. Non-Operational AT Commands .................................6-6

Table 6-3. Result Codes for Basic AT Parameter Commands ......6-9

Table 6-4. Common Result Codes for S-Register Commands ....6-24

Table 6-5. SMS Print Command Field Definitions ....................6-54

Table 6-6. SMS Info Command Field Definitions ......................6-59

Table 6-7. Modem Status Information .......................................6-63

Table 7-1. Interface Connector Pinouts ......................................7-10

Table 7-2. Diagnostic Port Pinouts .............................................7-14

Table 7-3. Modem DC Power Consumption Estimates

at 12 V DC Input .........................................................7-17

Table 7-4. Suggested RF Cable and Connector Suppliers ..........7-26

Table 7-5. Swept Sine Vibration Definition ...............................7-33

Table 8-1. Troubleshooting Modem Problems ..............................8-1

Table E-1. Specification Summary — GSP-1620 Modem .......... E-1

Table E-2. Specification Summary — Dielectric Resonator

Antenna (DRA) ............................................................E-3

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xiv 80-99208-1 Rev . D

REVISION HISTORY

Version Release Date Notes

Rev. A August 23, 2000 First Production Release

Rev. B October 13, 2000 Revised hardware specifications

Rev. C January 25, 2001 Release to accompany GSP-1620 modem software

Rev. D April 17, 2001 Updates and corrections:

version 5.2:

■ Changed modem name and manual title

(removed “packet”)

■ Added information about asynchronous data,

especially in Chapters 5 and 6

■ Revised Diagnostic cable graphic and

procedures in Chapter 2

■ Revised Customer Service information in

Appendix D

■ Added antenna specifications to Appendix E

■ Revised some AT command descriptions or

parameter values in Chapter 6

■ Added pinout information for Diagnostic port

in Chapter 7

■ Added references to the Modem Operation

Monitor in Chapters 2 and 6

■ Applied new document layout design

80-99208-1 Rev. D xv

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xvi 80-99208-1 Rev . D

This QUALCOMM Globalstar GSP-1620 Satellite Data Modem Integrator’s Reference Manual, also referred to as the Integrator’s Reference Manual, provides the information

needed to install and use the QUALCOMM Globalstar GSP-1620 Satellite Data Modem, also referred to as the GSP-1620 modem in this document.

Who Should Use This Manual

This manual is intended for the following users:

• People who set up the modem from the Modem Integrator’s Kit on a bench for development and testing

• Application developers who create software applications that work with the GSP-1620 modem

• Developers and OEMs who service-program modems to make them work with Globalstar Service Providers

• OEMs or system integrators who incorporate GSP-1620 modem hardware into commercial products (for example, oil pipeline monitors)

ABOUT THIS MANUAL

• OEM field technicians who install those products on site

Getting Started on page 1-1 includes a roadmap pointing different users to relevant sections in this manual.

80-99208-1 Rev. D xvii

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How Th is Manual Is Organized

This following table summarizes how information is organized in this manual.

Chapter Description

Chapter 1. Getting Started Introduction to the GSP-1620 modem and

Chapter 2. Quick Bench Set-Up

Chapter 3. Service-Programming Modems

Chapter 4. Making Simple Data Calls

Chapter 5. Developing Modem Applications

Chapter 6. AT Command Reference

Chapter 7. Integrating GSP-1620 Modems into OEM Products

Chapter 8. Troubleshooting Suggested solutions for modem problems.

Appendix A. Globalstar Background

Appendix B. RF Certification/ Restrictions

the Modem Integrator’s Kit.

Quick instructions for connecting and powering up the modem and sending commands via HyperTerminal.

Coordinating with Service Providers and re-programming default modem parameters.

Quick tutorial on setting up a PC for packet data, making mobile-originated packet data calls, and using modem ports.

Developing software applications that work with modem features.

Developer’s reference for AT commands, syntax, and values.

Hardware descriptions of the modem and antenna, mounting guidelines, and environmental specifications.

Globalstar space and ground segments, coverage and carriers.

Certification compliance and RF restrictions for the modem and antenna.

Appendix C. Warranty QUALCOMM warranty information for

Appendix D. Product Support How to contact QUALCOMM Globalstar

Appendix E. Specification Summary

xviii 80-99208-1 Rev. D

the GSP-1620 modem.

Customer Service.

Quick reference list of hardware specifications for the GSP-1620 modem and antenna.

Notational Conventions

The following table shows the notational conventions that convey specific types of information in this manual.

Convention Description

About This Manual

Commands, parameters, values, filenames, directory locations

Items shown in courier typeface indicate commands, parameters, filenames, and directory locations.

<Non-literal elements> Items shown within angle brackets

and

<courier> indicate non-literal

elements for which you type a substitute.

Menu items and buttons Menu items, commands, and buttons

Dialog box and window titles Dialog box and window titles appear in

Book titles and section references Book titles and section references

Steps

1 2 3

Note

Tip

appear in bold sans serif.

bold sans serif.

appear in italics.

This symbol identifies “how-to” procedure. Follow these steps to accomplish a specific task.

This symbol identifies related information that deserves emphasis.

This symbol identifies a shortcut or information that you might find handy.

Caution

Warning

80-99208-1 Rev. D xix

This symbol identifies a potentially hazardous situation which, if not avoided, could damage equipment or property.

This symbol and bold text identify potential danger, which, if not avoided, could cause serious injury or death.

Integrator’s Reference Manual

Abbreviations and Acronyms

AC Alternating Current

API Application Programming Interface

AT Attention

CCA Circuit Card Assemblies

CDMA Code Division Multiple Access

CDR Call Detail Record

CD-ROM Compact Disc Read-Only Memory

CE Community European

CFR Code of Federal Rules

CP Control Port

CTS Clear To Send

DC Direct Current

DCD Data Carrier Detect

DCE Data Communications Equipment

DM Diagnostic Monitor

DN Directory Number

DNI Do Not Install

DNS Domain Name Server

DP Data Port

DRA Dielectric Resonator Antenna (see ODU)

DSR Data Set Ready

DTE Data Terminating Equipment

DTR Data Terminal Ready

EIRP Equivalent Isotropic Radiated Power

ESD Electrostatic Discharge

ESN Electronic Serial Number

FAX Facsimile

FCC Federal Communications Commission

xx 80-99208-1 Rev. D

About This Manual

FDX Full-Duplex

GAI Globalstar Air Interface

GEO geostationary-Earth-orbit

GLP Globalstar Limited Partnership

GMT Greenwich Mean Time

GND Ground or Signal Common

GPS Global Positioning System

GW Gateway

IMSI International Mobile Subscriber Identity

IP Internet Protocol

ISP Internet Service Provider

IWF Interworking Function (Gateway)

LCD Liquid Crystal Display

LEO low-Earth-orbit

LNA Low Noise Amplifier

MCC Mobile Country Code

MCX Miniature Coaxial Connector

MEO medium-Earth-orbit

MIK Modem Integrator’s Kit

MNC Mobile Network Code

MPE Maximum Permissible Exposure

MSIN Mobile Station Identification Number

MSS Mobile Satellite System

NAM Number Assignment Module

ODU Outdoor Unit (see DRA)

OEM Original Equipment Manufacturer

OSPL Overall Sound Pressure Level

PC Personal Computer

PDF Portable Document File

PDT Pacific Daylight Time

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PLS Position Location Service

POS Point of Sale; or Position

PPP Point-to-Point Protocol

PST Pacific Standard Time

PSTN Public Switched Telephone Network

PT Pacific Time

QA Quality Assurance

RF Radio Frequency

RFR Ready For Receive

RI Ring Indicator

RLSD Received Line Signal Detector

RMA Return Material Authorization

RSSI Received Signal Strength Indicator

RTS Ready To Send

RTU Remote Termination Unit

X Receive

XD Receive Data

SCADA Supervisory Control and Data Acquisition

SLIP Serial Line Internet Protocol

SMA Subminiature type “A” Connector

SMS Short Messaging Service

SMT Surface Mount Technology

SP Service Provider

SPC Service Programming Code

TCP Transmission Control Protocol

TCXO Temperature Compensated Crystal

Oscillator

TSS Technical Support Specialist

TTL Transistor Transistor Logic

X Transmit

xxii 80-99208 -1 Rev. D

TXDTransmit Data

UCT Universal Coordinated Time

URL Uniform Resource Locator

UT User Terminal

UTC Universal Time Coordinated

UTPST User Terminal Program Support Tool

VPN Virtual Private Network

VSWR Voltage Standing Wave Ratio

Related Document ation

Globalstar UT Program Support Tool User’s Guide,

80-98225-1.

Globalstar User Terminal Service Programming Guide, 80-98482-1.

Globalstar UTPST Script API Reference Manual, 80-99114-1.

QUALCOMM Globalstar Data User Guide, 80-99126-1.

About This Manual

QUALCOMM Globalstar Modem Operation Monitor User’s Guide, 80-99399-1.

80-99208-1 Rev. D xxi ii

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Warning

Caution

Cautions and Warnin gs

Before working with the modem hardware or power connections, remove rings, watc hes, and other metallic objects that could cause electrical shock or burns.

Use proper elect rostatic dis charge (ESD) equipment and procedures to avoid damage to the modem.

Any changes or mod ification s to this equipm ent not expr essly appr oved in this doc ument coul d v oid your warra nty and y our authori ty t o operat e this equipment .

xxiv 80-99208-1 Rev. D

1 GETTING STARTED

Welcome to the Integrator’s Reference Manual for the QUALCOMM Globalstar GSP-1620 Satellite Data Modem.

The GSP-1620 modem offers data communication solutions, particularly for Remote Monitoring and Supervisory Control and Data Acquisition (SCADA) applications in locations such as power substations, telecommunication concentration nodes, oil and gas wells, pipes, and offshore facilities.

Whether you are an application developer, system integrator, or Original Equipment Manufacturer (OEM), this Integrator’s Reference Manual contains information you need.

If you want to: Go to:

■ Bench-set up, connect, and power-up the

GSP-1620 modem in the Modem Integrator’s Kit, and get HyperTerminal to talk to the modem

■ Service-program modems to work with

your Service Provider (SP) and within the Globalstar system

■ Set up your computer for packet data and

make a simple packet data call

■ Develop market-specific application

software to work with the GSP-1620 modem (using packet data or asynchronous data)

■ Understand modem AT commands

■ Mount GSP-1620 modems and antennas

for market-specific OEM products (including all hardware and environmental specifications)

■ Troubleshoot modem problems

Chapter 2

Chapter 3

Chapter 4

Chapter 5

Chapter 6

Chapter 7

Chapter 8

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Tip

Note

GSP-1620 Modem Overview

The QUALCOMM Globalstar GSP-1620 Satellite Data Modem delivers reliable digital data communications wherever Globalstar data service is available, using QUALCOMM’s patented CDMA technology and the Globalstar Communications System’s constellation of 48 low-Earth-orbit (LEO) satellites.

The GSP-1620 modem handles two kinds of data connections:

• Packet — over the Internet or other TCP/IP packet-switched network

• Asynchronous — routed through the Public Switched Telephone Network (PSTN) to a destination modem

QUALCOMM Globalst ar p acket d ata ser vi ce has a lowe r overh ead a nd faster connection time than asynchronous data does. If a SCADA application d oes n ot specif ical ly need asynchr onous data, it s hould us e packet data instead.

As an OEM, you directly integrate the GSP-1620 modem into a market-specific product, to resell to a business/industrial customer.

For additio nal information about t he Globalstar system, see Globalstar Background, page A-1. For information about buying bul k modems from

QUALCOMM, contact QUALCOMM Glob alstar Customer Service as described in Appendix D.

1-2 80-99208-1 Rev. D

Typical Modem SCADA Applications

In remote settings or difficult-to-access sites, acquiring and responding to process control and alarm data can be challenging and costly. For both system integrators and OEMs, the QUALCOMM Globalstar GSP-1620 Satellite Data Modem provides real-time, low cost, bi-directional data communication solution applications in remote locations for fixed or mobile use.

The GSP-1620 modem lets you retrieve data automatically from remote sites. Unmanned sensors connected to the GSP-1620 modem can monitor remote operations and initiate alert notifications.

Table 1-1 lists some typical Remote Monitoring and Supervisory Control and Data Acquisition (SCADA) applications.

T able 1-1. T ypical GSP-1620 Modem Applications

Getting Started

Electric Utility Industry Remote Security Systems

Oil and Gas Wells, Tanks, Pipelines, Offshore Platforms

Water Treatment Plants Retail Point of Sale (POS)

Remote Inventory Management

Electronic Billboards Agriculture

Highway Traffic Monitoring Aircraft Weather/Messaging

Monitoring

Energy Management

Transactions

Remote Banking

for Commercial and General Aviation

Figure 1-1 depicts a typical use of the GSP-1620 modem for a SCADA application using packet data.

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Figure 1-1. Typi cal Modem SCADA Appl ication Usi ng Pack et Data

Satellite

Remote

DTE

SCADA Terminal

Outdoor Antenna

Globalstar

Gateway

DCE

GSP-1620

Modem

Internet

Data Port

Control Port

Host

Server

For packet data connections, the GSP-1620 modem essentially functions as a “node” on the Internet and, with its fixed or dynamically assigned IP address, can be addressed in real time as often as necessary to maintain application control over the remote devices.

Figure 1-2 depicts a typical use of the GSP-1620 modem for a SCADA application using asynchronous data.

1-4 80-99208-1 Rev. D

Getting Started

Figure 1-2. Typical Modem SCADA Application Using

Asynchronous Data

Satellite

Remote

DTE

SCADA Terminal

Outdoor Antenna

Data Port

Control Port

Globalstar

Gateway

DCE

Gateway IWF Modem

GSP-1620

Modem

PSTN

Host Modem

Host

Server

For asynchronous data connections, the GSP-1620 modem can dial or be dialed by a host modem, connecting through the Globalstar Satellite Communications System and the PSTN.

You can think of the GSP-1620 modem in Figure 1-1 and Figure 1-2 as a 9600 bps full duplex satellite modem. The modem uses typical Hayes AT commands (see Chapter 6, AT Command Reference). Standard RS-232 interfaces facilitate ease of use and OEM application integration.

For either packet or asynchronous connections, OEMs provide the host application (server), which uses the GSP-1620 modem to communicate with a custom SCADA application on data terminating equipment (DTE) at a remote site. The host application manages the field processing of data and reports process exceptions, performance reports, alarm conditions—in short, any data needed from the remote site.

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For example, in the electric utility industry, a SCADA application using the GSP-1620 modem could remotely turn on a pump, close a switch, open a gate, request a new meter reading, monitor line voltage, or report on power outages.

Conceptual Overview

Figure 1-3 depicts a conceptual overview of the QUALCOMM Globalstar GSP-1620 Satellite Data Modem, including its ports and antenna.

Figure 1-3. Conceptual Diagram of GSP-1620 Modem

Outdoor Antenna

Diagnostic Port

GSP-1620

Modem

Interface Port

Serial Control Port

Modem AT commands

SCADA Application Terminal

Serial Data Port

Data or AT commands

UT Program Support Tool

(UTPST)

for service programming

DC Power

5.6V-16V

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Getting Started

The GSP-1620 modem is a bare board “sandwich” stack of Circuit Card Assemblies (CCA) containing two boards:

• Globalstar RF board — includes the LNA, RF power amp,

upconverters and downconverters, TCXO, synthesizers, and the remaining power electronics.

• Globalstar Digital board — includes the processor, the

modem, and some of the power management electronics.

QUALCOMM offers the GSP-1620 modem without a mechanical enclosure, anticipating that OEMs will integrate and package the modem with the end-user’s application.

The GSP-1620 modem operates in the “Globalstar (or satellite) data mode only,” as opposed to the GSP-1600 Tri-Mode Phone, which has additional terrestrial cellular (analog and digital) and voice capabilities. The GSP-1620 modem is powered by an external power source provided by the user.

A weatherproof Dielectric Resonator Antenna (DRA), sometimes referred to as an Outdoor Unit (ODU), comes with each modem. OEMs provide antenna cables (SMA to MCX connectors), to meet customer antenna-cable length needs.

A single DB-25 (male) connector is used for the user interface port. The DB-25 carries DC power, as well as the Data and Control RS-232 signals, between the SCADA application (DTE) and the modem (DCE).

A Diagnostic port on the modem allows network provisioning (service programming) and software upgrades.

What’s in the Modem Integrator’s Kit?

Your GSP-1620 Modem Integrator’s Kit (MIK) is designed to help you rapidly develop user applications for GSP-1620 modems.

Table 1-2 shows the items contained in your GSP-1620 Modem Integrator’s Kit (QUALCOMM part number: MCN 65-82317-1).

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T able 1-2. Checklist of Modem Integrat or’s Kit Components

Kit Component

QUALCOMM Globalstar GSP-1620 Satellite Data Modem

Dielectric Resonating Antenna (DRA)

Pair of antenna cables with connectors (for quick bench setup of the kit modem)

Custom DB-25 cable bridle, which splits out the DE-9 Data Port connector, the DE-9 Control Port connector, and the DC power leads (positive, negative, and reset)

Diagnostic port cable, for service-programming the modem or to use as alternate power source via its AC adapter

GSP-1620 modem CD-ROM containing the following:

■ Software code samples for modem applications

■ A “soft copy” (PDF file) of this Integrator’s Reference

Manual

■ “CDMA by QUALCOMM” logo in an Encapsulated

PostScript (EPS) file

■ A “soft copy” (PDF file) of the QUALCOMM Globalstar

Data User Guide, 80-99126-1EN, as a guide for the

setup of a Windows modem driver and Windows Dial-Up Networking.

Globalstar UT Program Support Tool (UTPST), including:

■ CD-ROM containing the UTPST software and a “soft

copy” (PDF file) of the Globalstar UTPST Script API Reference Manual, 80-99114-1

■ Globalstar UT Program Support Tool User’s Guide,

80-98225-1

■ Globalstar User Terminal Service Programming

Guide, 80-98482-1

1-8 80-99208-1 Rev. D

What You May Need in Addition to the Kit

The Modem Integrator’s Kit should be sufficient for setting up one modem on a bench for development and testing.

For GSP-1620 modem development purposes (bench setup and developing modem applications), it is recommended that you have a Windows PC, because the Modem Integrator’s Kit CD-ROM contains some Windows code samples.

If necessary, you can power the modem via the AC adapter on the Diagnostic cable, but you may prefer to use your own DC power supply. Mounting a bench modem and antenna is optional, but would require M3 and M4 screws, respectively, and a screwdriver.

OEMs who are packaging modems into end-user products will need to supply mounting enclosures and customized cables. For details, see Integrating GSP-1620 Modems into OEM Products on page 7-1.

Configuration and setup of computer systems to use the GSP-1620 modem with Point-to-Point Protocol (PPP) is beyond the scope of this document. However, the configuration procedures for the QUALCOMM Globalstar GSP-1600 Tri-Mode Phone are included as a reference in the QUALCOMM Globalstar Data User Guide, 80-99126-1 (located on the kit’s CD-ROM). For example, using the procedures in that document, you can set up a Windows modem driver and Windows Dial-Up Networking. With the proper DNS addresses from your Service Provider (SP) or Internet Service Provider (ISP), you can access the Internet using your GSP-1620 modem via the Globalstar satellite system.

Getting Started

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2 QUICK BENCH SET-UP

Note

Caution

Your GSP-1620 Modem Integrator’s Kit contains a QUALCOMM Globalstar GSP-1620 Satellite Data Modem. This chapter tells how to quickly set up the GSP-1620 modem on a test bench so that you can interact with it, including the following topics:

• Connecting hardware components as appropriate for a

bench setup

• Providing power to the modem

• Setting up HyperTerminal to talk to the modem and

query its status, using modem AT commands

Keep in mind that the quick bench setup shown in this chapter differs from the setup you might use for developing applications, integrating modems permanently into OEM products, or for field installation.

For example, in the quick bench setup, you communicate with the modem by typing AT commands into HyperTerminal, whereas a SCADA application will communicate with the modem using AT commands embedded within its code.

Also, in the quick bench setup, you can use the cables provided in the kit to connect to the modem ports and antenna, whereas for a SCADA field installation, OEMs will make custom cables.

Examples in this chap ter assume you are connec ting a Win dows PC to the modem.

For your safety and to avoi d potential damage to the equipment , observe the Cauti ons and W arnings on page xxiv.

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Tip

Caution

Connecting Hardware Components

The setup process for the GSP-1620 modem includes:

• A quick tour of the modem

• Connecting the modem cables

❑ Connecting the Interface cable (Data port, Control

port, power) to the modem and to your PC

❑ Connecting the antenna cables (Tx, Rx) to the modem

❑ Connecting the Diagnostic cable (if you want to power

the modem from its AC adapter, service-program the modem, or monitor some modem functions)

• Connecting and mounting the antenna

• Mounting the modem (optional)

• Grounding the system

• Providing power to the modem

• Setting up HyperTerminal to talk to the modem and testing your connection

A Windows PC is recommended for modem bench setup and application development. Modem s m ust be service pr ogrammed using the Globals tar UT Program Suppor t Tool, which is a Windows software application.

A Quick Tour of the Modem

For quick bench set-up, first remove the GSP-1620 modem from the GSP-1620 Modem Integrator’s Kit.

When handling the modem , observe precautions necessary to avoid damage by electrost atic discharge (ESD).

Compare the GSP-1620 modem to Figure 2-1. This illustration shows the connectors and components you will use in the following sections.

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Quick Bench Set-Up

Figure 2-1. Simplified Top View of GSP-1620 Modem

Mounting hole

Receive (Rx) ant en na lead

conn ec ts he re ( J7 )

Transmit (Tx) antenna lead

conn ec ts he re ( J3 )

Diagnostic Port

(Diagnostic cable conn ec ts he re for UTPST, AC power adapter, or Modem Operation Monitor)

Mounting hole

Inter face Port: combines Data Port, Control Port, and DC Power input

(Modem Interface Cable from kit connects here, or OEMs make their own custom cables)

Mounting hole

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Connecting the Modem Cables

For the GSP-1620 modem to work, you must connect several cables:

• Modem interface cable — connects the Data port to a PC, connects the Control port to a PC (optional), and connects power leads to a DC power supply.

• Antenna cables — connect the transmit (Tx, J3) and receive (Rx, J7) leads to the Tx and Rx connectors on the Dielectric Resonator Antenna.

• Diagnostic cable — connects the Diagnostic port to a PC running the Globalstar UT Program Support Tool (UTPST) for modem service programming, or the QUALCOMM Globalstar Modem Operation Monitor; can also be used as an optional, alternate power supply via its AC adapter.

Connecting the Modem Interface Cable

Your Modem Integrator’s Kit includes a custom DB-25 modem interface cable bridle, which connects to the Interface port on the modem. The cable bridle splits out the DE-9 Data Port and DE-9 Control Port, and the DC power connectors (DC POWER, SIG GND, and RESET), as shown in Figure 2-2.

Figure 2-2. Modem Interface Cable Bridle

Modem Interface Cable

Modem connector

To modem

Power connectors:

"SIG GND" (black) "RESET"

"DC POWER" (red)

To DC power supply

(user-provided)

2-4 80-99208-1 Rev. D

(yellow)

Open

(ground to reset)

"P2-DATA PORT" PC serial connector

To PC

"P3-CONTROL" PC serial connector

To PC

Quick Bench Set-Up

Steps

Note

TO CONNECT THE INTERFACE CABLE TO THE MODEM

1 2 3

■ Connect the DB-25 modem connector on the interface

cable (Figure 2-2) to the interface port on the modem (Figure 2-1).

Do not connect power yet.

TO CONNECT THE INTERFACE CABLES TO YOUR PC

1 2 3

1. On the interface cable (Figure 2-2), connect the Data port

connector (labeled “P2-DATA PORT”) to COM 1 or another available serial COM port on your PC.

The Data port transmits packet (PPP) or asynchronous data. You can also use it to send AT commands to the modem. You will see an example of how this works in Chapter 4.

2. On the interface cable (Figure 2-2), connect the Control

port connector (labeled “P3-CONTROL”) to COM 2 or another available serial COM port on your PC (or a different PC, if desired).

You can use the Control port to send AT commands to the modem, without interrupting data flow on the Data port. You will see an example of how this works in Chapter 4. The Control port can also receive SMS messages; for information, see Short Messaging Service (SMS) on page 5-17.

If you need to extend the interface cables to r each your PC(s), you can use straight RS-232 9-pin serial cables (with no crossovers). For maximum RS-232 extensi on cable lengths, see the TIA/EIA-232-E specification.

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Caution

Steps

Connecting Antenna Cables

The Modem Integrator’s Kit contains two antenna cables (3 feet long) with snap-in connectors, for connecting the modem to the Dielectric Resonator Antenna (DRA). The antenna must be located outdoors.

Due to loss constraints on antenna length (see Calculating Antenna Cable Length on page 7-27), if you need to extend the kit cables to reach your antenna, it is more practical to locate the modem closer to the antenna and extend the modem’s serial cables instead. For a tip on how to do this, see Connecting and Mounting the Antenna on page 2-9.

OEMs must supply custom antenna cables for their modem applications.

Either antenna cable in the developer’s kit can be used for tra nsm it or receive; however, you must make sure not to cross them. In other words, be careful to connect the Tx connector on the antenna to the Tx connector (J3) on the modem, and the Rx connect or on the antenna t o the Rx connector (J 7) on th e mode m. Crossing the Tx and Rx cables can damage the modem.

TO CONNECT THE ANTENNA CABLES TO THE MODEM

1 2 3

1. Select one antenna cable to be the transmit cable (it does

not matter which one).

2. Label both ends of that cable with “Tx.” For example, you could write “Tx” on a piece of tape wrapped around each end of the cable.

3. Plug either end of the cable marked “Tx” into the transmit (Tx) connector (J3) on the modem, as shown in Figure 2-1.

4. Plug either end of the unmarked cable into the receive (Rx) connector (J7) on the modem, as shown in Figure 2-1.

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Quick Bench Set-Up

Note

Tip

Connecting the Diagnostic Cable

The Diagnostic cable lets you:

• Service-program GSP-1620 modems, using the

Globalstar User Terminal Program Support Tool (UTPST). For more information about the UTPST, see UTPST Overview on page 3-2.

• Monitor or verify some modem functions, using the

QUALCOMM Globalstar Modem Operation Monitor. For more information, see the QUALCOMM Globalstar Modem Operation Monitor User’s Guide, 80-99399-1.

The cable includes an optional AC adapter. If a DC power supply is not available on your bench, you can power the modem with the AC adapter on the Diagnostic cable.

The Diagnostic cable also includes a switch box that controls whether the cable’s DTR (Data Terminal Ready) signal is asserted (“POS 1 DTR to GND”) or de-asserted (“POS 2 DTR Open” or “POS 3 Not Used”). When DTR is asserted, the modem powers up immediately if power is provided. Before powering down the modem with this cable attached, you must set this switch to “POS 2” or “POS 3.”

On the switch box, “POS 2 DTR Open” and “POS 3 Not Used” are functionally equivalent. Some cables are equipped with a two-position switch box and do not have “ POS 3.” The swi tch positions for these cables are “POS 1 DTR to GND” (DTR asserted) and “POS 2 DTR Open” (DTR de-assert ed).

When the Diagnostic cable is connected but you are not using the UTPST to service-progr am the modem, leave the Diagnostic cable switch in the “POS 2 DTR Open” (de-as serted) position.

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Figure 2-3. Modem Diagnostic Cable

AC Wall adapter

PC Connector "P1 - PC"

Lock ring

Power connector

Locking threads

DTR OPEN

POS 1

DTR to GRD

DTR Switch box

T able 2-1. DTR Switch Positions

POS 2

Modem connector "P2 - module"

POS 3

NOT USED

005AA_01

Position Switch Label Effect

POS 1 DTR to GND DTR is asserted.

POS 2 DTR Open DTR is de-asserted.

POS 3 Not Used DTR is de-asserted

(equivalent to POS 2). Note: Some cables are equipped with a

two-position switch box and do not have “POS 3.” The switch positions for these cables are “POS 1 DTR to GND” (DTR asserted) and “POS 2 DTR Open” (DTR de-asserted).

2-8 80-99208-1 Rev. D

Steps

TO CONNECT THE DIAGNOSTIC PORT CABLE

Caution

Tip

1 2 3

1. Connect the DE-9 modem connector (“P2-Module”) on the

Diagnostic cable (Figure 2-3) to the 9-pin Diagnostic port on the modem (Figure 2-1).

2. Connect the DE-9 PC connector (“P1-PC”) on the

Diagnostic cable to a COM port on your computer.

3. Locate the switch on the cable, and set it to “POS 1 DTR

to GND.”

Do not plug in the AC wall adapter yet. For information about powering the modem, see Providing Power to the Modem on page 2-12.

Connecting and Mounting the Antenna

The GSP-1620 modem uses a Dielectric Resonator Antenna (DRA) with a passive transmit and an active receive section. The transmit (Tx) and receive (Rx) connectors are labeled on the base of the antenna.

Since the antenna communicates with Globalstar satellites, it must be positioned outdoors where it has a clear view of the sky, unimpeded by tall obstacles such as buildings and trees.

Quick Bench Set-Up

Antenna cable leng th i s li m it ed, due to insertion loss and potential emission probl em s. For details, see Antenna Cable Specifications on page 7-25 and Calculating Antenna Cable Length on page 7-27.

For a quick setup, you may want to mount the antenna on top of a water-tight b ox on y our roof . Mount the mo dem insi de the box , then r un extension cabl es (straight RS-232 9-pin seri al cables with no crossovers) for the power and serial connectors to your indoor bench. (For maximum RS-232 extensi on cable lengths, see th e TIA/EIA-232-E specifica tion. ) A box s et up let s you use the antenna cabl es fr om th e kit, without worrying about antenna cable length.

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Steps

Caution

Figure 2-4. Antenna Base Showing Connectors

TO MOUNT THE ANTENNA

1 2 3

1. Locate the antenna outdoors where it has a clear view of

the sky. Make sure the antenna is close enough to the modem that you can use the antenna cables provided in the Modem Integrator’s Kit.

O-Ring groove

RX Antenna connector (labeled on antenna base)

TX Antenna connector (labeled on antenna base)

The antenna must have a clear view of the sky to get a strong signal.

2. Plug the antenna cable that you labeled “Tx” into the transmit connector (also labeled Tx) on the antenna (Figure 2-4). Make sure the other end of the cable is connected to the J3 connector on the modem.

You must be careful to connect the Tx connector on the antenna to the Tx connector on the modem, and the Rx connector on the antenna to the Rx connector on the mode m. Crossing the Tx and Rx cables can damage the modem.

2-10 80-99208-1 Rev. D

3. Plug the other antenna cable into the receive (Rx)

Note

Caution

4. Secure the antenna to a flat surface using six M4 screws

For complete details about sealing the antenna to a flat mounting surface, or for information about mounti ng antennas on poles, see Mounting Antennas at the Field Site on page 7-27.

Mounting the Modem

For quick bench set-up, you probably do not need to mount the modem to a surface or in an enclosure, as it would be mounted in an OEM product for use in the field.

Quick Bench Set-Up

connector on the antenna.

through the six mounting holes. To prevent moisture and dirt from getting underneath the antenna and onto the connectors, you can use an O-ring (2.050 inches in diameter by 0.103 inch wide, silicone or ethylenepropylene) if the mounting surface is smooth, or adhesive caulking if the surface is rough.

If you do wish to fasten the modem to a rigid structure, you will need six M3 screws (see mounting holes in Figure 2-1).

For details, see Modem Mounting Guidelines on page 7-19. For details on acceptable environmental conditions for the modem, see Environmental Specifications on page 7-30.

For a tip on how to mount the modem and antenna using a box, see Connecting and Mounting the Antenna on page 2-9.

Grounding the System

You have several options for grounding the modem; see Grounding on page 7-18.

The RF connector ground i s the same as the signal and power ground. Incorrect ly wiring these grounds could cause ground loops in the final installation.

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Tip

Caution

Note

Providing Power to th e Modem

The GSP-1620 modem requires input DC power of 5.6 V to 16 V, 1 Amp (maximum), with a maximum of 50 mV peak-peak ripple and noise.

Using the contents of the Modem Integrator’s Kit, you can power your bench modem in two ways:

• Use the AC adapter on the Diagnostic cable

• Use an optional DC power supply connected to the Interface cable bridle — this allows you to monitor exact power levels

The use of a fuse is strongly recommended in the DC power supply. A fuse with a minimum melting I

t rating of 0.02 A seconds will be sufficient. For complete details about DC power requirements and power supply impedances, see DC Power on page 7-15.

For a quick bench set up or service program ming, consider just using the provided AC adapter to power the modem.

You CANNOT have both a DC power supply and the AC adapter connected to the modem at the same ti me. Thi s may c ause the modem to fail to power up and may damage the modem.

The following power-on procedure is suitable for a bench setup. However, if you are developing modem applications, follow th e power-on process explained in Power-On on page 7-17.

2-12 80-99208-1 Rev. D

Quick Bench Set-Up

Steps

TO POWER THE MODEM USING THE KIT’S AC ADAPTER

1 2 3

1. On the Modem Interface cable bridle (shown in Figure

2-2), locate the DC POWER (red) and SIG GND (black) connectors. Then electrically isolate each connector by capping or taping it.

Since you will be using the AC adapter instead of a DC power supply, it is important to isolate the DC power connectors to prevent shock.

2. On the Modem Interface cable bridle (shown in Figure

2-2), locate the RESET lead (yellow). Electrically isolate the RESET lead by capping or taping it.

The RESET lead is designed to reset the GSP-1620 modem whenever it is grounded for five seconds. Electrically isolating the lead prevents it from grounding and inadvertently resetting the modem.

3. Locate the power connector in the middle of the

Diagnostic cable (as shown in Figure 2-3), then plug the the AC wall adapter cable into the power connector.

4. Tighten the lock ring on the adapter cable onto the

locking threads of the power connector, so the adapter plug remains firmly seated in the power connector.

The lock ring prevents the adapter cable and Diagnostic cable from inadvertently disconnecting and interrupting power to the modem.

5. Make sure the switch on the Diagnostic cable is set to

“POS 1 DTR to GND.”

When this switch is set to “POS 1 DTR to GND,” DTR is asserted on the Diagnostic cable and the modem will power up immediately when power is applied.

6. Plug the AC wall adapter (as shown in Figure 2-3) into an

AC power wall outlet.

You are now ready to use the modem.

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Caution

Steps

T o power of f the GSP-1620 mode m, s et the DTR s witch to “POS 2 DTR Open,” wait at least 10 se conds, a nd then dis connect power. Setting the DTR switch to “POS 2” allows the modem to gracef ully shut down. If the modem is powered off without allowing it to go through its shutdown sequence, some se rvice programming value s may be lost .

TO POWER THE MODEM USING AN OPTIONAL DC POWER

1 2 3

SUPPLY

1. Obtain an optional DC power supply, making sure that it

meets the specifications described at the beginning of this section.

2. On the Modem Interface cable bridle (shown in Figure

2-2), locate the RESET lead (yellow). Electrically isolate the RESET lead by capping or taping it.

The RESET lead is designed to reset the GSP-1620 modem whenever it is grounded for five seconds. Electrically isolating the lead prevents it from grounding and inadvertently resetting the modem.

3. Plug the DC POWER (red) and SIG GND (black) leads

from the Modem Interface cable bridle into your DC power source.

4. Turn on the power supply.

You are now ready to use the modem.

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Quick Bench Set-Up

Note

Steps

Setting Up HyperTerminal to Talk to the Modem

To talk to the modem you will need HyperTerminal or a similar program on your computer. If you are using an operating system other than Windows, you can use any application that can talk to a serial port.

For bench setup, you pr obably want to run HyperTerminal on the computer connected to the Control port of the modem. For testing purposes, you can run two different Hyper Terminal sessions, one connected to the Cont rol port and one connected to the Dat a port .

TO SET UP HYPERTERMINAL AND CONNECT TO THE MODEM

1 2 3

1. Set up HyperTerminal with the correct port and speed

information for the appropriate port (or both ports, if you have two HyperTerminal sessions).

The following are the recommended HyperTerminal settings for the Control and Data ports:

Name

Connect using

Bits per second

Data bi ts Parity Stop bits Flow control

80-99208-1 Rev. D 2-15

Control port: GSP1620_Control Data port: GSP1620_Data

Computer COM port connected to modem Control port or Data port

Control port: 9600 (fixed) Data port: 38400 (default, but can

vary from 300 to 115200)

None

Control port: None Data port: Hardware (default and

recommended, but can vary from None to Software)

Integrator’s Reference Manual

Tip

2. In HyperTerminal, click OK to accept the settings.

HyperTerminal automatically attempts to connect to the modem, and the modem powers on when HyperTerminal asserts the RS-232 DTR signal. Once it has connected you should see the following within a few seconds:

SELF TEST RESULT: OK

Note: The SELF TEST RESULT message appears only during modem power-up. If the Diagnostic cable has been connected and its switch is set to “POS 1 DTR to GND,” then the modem has already powered up. In that case, proceed to step 3 without waiting for the message.

3. Type

If the HyperTerminal port connection is correctly configured, the modem should respond with:

You can connect to the modem at any time by clicking HyperTerminal’s

Connect button.

Testing the Modem Setup

To ensure that the modem was set up correctly and that the ports are working, you can check the following:

• Control port baud rate

• Data port baud rate

AT and press Enter.

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Quick Bench Set-Up

Steps

Note

TO CHECK THE BAUD RATE ON THE CONTROL PORT

1 2 3

1. Look at the Status bar at the bottom of the

HyperTerminal window.

It should read “9600 8-N-1.” The Control port has a fixed baud rate of 9600. Be sure HyperTerminal is configured accordingly.

2. To confirm that HyperTerminal can communicate with

the modem, type

AT and press Enter.

The modem should respond with:

TO CHECK THE BAUD RATE ON THE DATA PORT

1 2 3

■ From HyperTerminal (probably on the Control port),

type:

AT+IPR? and press Enter.

The modem should respond with the following:

+IPR: 38400 (or whatever the current baud rate is)

38400 is the default setting for the Data port. If you change the baud rate setting for the modem’s Data port, be sure to configure HyperTerminal accordingly.

You can enter AT+IPR? on either the Control port or the Data port , but it always responds wit h the baud rate of the Data port.

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Steps

Tip

Steps

Resetting or Powering Off the Modem

This section suggests some procedures suitable for resetting or powering off your bench modem.

If you are developing modem applications, you should consider additional issues for these topics, in the following sections: DTR/DSR Signal and Power On/Off on page 7-7, Power-Off on page 7-18, Hard Power Reset on page 7-18.

TO RESET THE MODEM

1 2 3

1. On the Modem Interface cable bridle (shown in Figure

2-2), locate the RESET lead (yellow).

2. Ground the RESET lead for at least five seconds to reset

the modem.

When you are not using the RESET lead, cap or tape it to isolate it electricall y. This prevents it from grounding and inadvertently reset ting the modem.

TO POWER OFF THE MODEM

1 2 3

1. If you are running a HyperTerminal session, disconnect

from the modem by clicking HyperTerminal’s

Disconnect

button.

2. Disconnect or close all other applications accessing the

modem’s serial ports (such as another HyperTerminal session or the Globalstar User Terminal Program Support Tool [UTPST]). It is not necessary to physically unplug the Modem Interface cable or Diagnostic cable from the modem.

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Quick Bench Set-Up

Warning

Tip

3. If the Diagnostic cable is connected to the modem, set the

switch to “POS 2 DTR Open.”

When this switch is set to “POS 2,” DTR is de-asserted on the Diagnostic cable and the modem begins its shutdown sequence.

4. Wait at least ten seconds for the modem to perform

shutdown operations and save information in memory.

The modem powers off approximately nine seconds after all ports are disconnected (including the Diagnostic port via the switch on the Diagnostic cable).

5. You can now safely disconnect the power supply from the

modem.

Do not unplug the power cables whil e the modem is powered up, or while the switch on the Diagn ostic c able is in “POS 1. ” Th is can cause ESD damage to the modem and also presents a danger of electrical shock.

When the Diagnostic cable is connected but you are not using the UTPST to service-progr am the modem, leave the Diagnostic cable

switch set to “POS 2.”

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Where to Go Next

Now that the GSP-1620 modem has power and you can communicate with it, here is where to go next:

To do this: Go to:

■ Service-program the modem to work

within the Globalstar system and with your Service Provider

■ Check whether the modem has Globalstar

service

■ Make a simple packet data call from the

modem, over-the-air

■ Develop software applications to work

with GSP-1620 modem features, including Data and Control ports, Short Messaging Service, Globalstar alerts, position location determination, packet data, IP addressing, dormant mode, asynchronous data, mobile-originated and mobile-terminated data calls

■ Refer to syntax, descriptions, and values

for supported AT commands

■ Integrate GSP-1620 modems into

market-specific OEM products

■ Refer to a hardware description of the

modem, including mechanical descriptions, specifications, user interfaces, port signaling and pinouts, and grounding

■ Mount modems in enclosures

■ Mount antennas on-site

■ Refer to modem hardware and

environmental specifications

Chapter 3

Chapter 4

Chapter 5

Chapter 6

Chapter 7

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3 SERVICE-PROGRAMMING MODEMS

Note

QUALCOMM Globalstar GSP-1620 Satellite Data Modems work within the Globalstar satellite system, using “airtime” offered by a Service Provider (SP). To operate, each GSP-1620 modem must be service programmed, meaning that certain key parameters (such as the Globalstar IMSI) must be configured to work with the SP.

For service programming, you connect the modem’s Diagnostic port to a Windows 98/NT/2000 PC, using the Diagnostic cable included in the Modem Integrator’s Kit. On the PC, you run the Globalstar User Terminal Program Support Tool (UTPST), which is included in your Modem Integrator’s Kit.

This chapter discusses how to coordinate with your SP to service-program GSP-1620 modems, including the following topics:

• UTPST overview

• Using the UTPST

• Re-programming default parameters

• Bulk-programming modems

• Upgrading modem software

This chapter does not discuss how to install the UTPST software, nor does it provide complete details on how to use the UTPST.

For detailed UTPST info rmation, see the Globalstar UT Program Support T oo l User’s Guide (80-98225 -1) in your kit. For details about al l service programming parameters, see the Globalstar User Terminal Service Progra mming G uide (80-98482-1).

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Note

Steps

UTPST Overview

The Globalstar User Terminal Program Support Tool (UTPST) lets you view, change, and save information pertaining to a Globalstar User Terminal (modem or phone). You can:

• Configure system settings (that is, service program),

either directly via the UTPST’s graphical user interface, or by writing scripts that access the UTPST’s Scripting API.

• Save configuration settings to a UTPST file or open them

from a file.

• Swap or transfer configuration settings from one modem

to another.

• Configure and generate summary data files.

• View modem information or statistics.

• Upgrade modem software.

To order Globalstar User Terminal Program Support Tools (QUALCOMM part number: MCN 64-C1005-4), contact QUALCOMM Globalstar Customer Service, as described in Appendix D.

Using the UTPST

This section tells how to connect the Diagnostic cable to a modem in preparation for using the UTPST.

TO CONNECT A MODEM TO A PC FOR USING THE UTPST

1 2 3

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1. Connect the Diagnostic cable to the Diagnostic port on the

modem and to an available COM port on your PC, as shown in Connecting the Diagnostic Cable on page 2-7.

Service-Programming Modems

Caution

Steps

Note

2. Make sure the power connectors of the Modem Interface

cable are not connected to a DC power supply.

3. Make sure the switch on the Diagnostic cable is set to

“POS 1 DTR to GND.”

When this switch is set to “POS 1,” DTR is asserted on the Diagnostic cable and the modem will power up immediately when power is applied.

4. Connect the AC adapter to the Diagnostic cable and to an

AC outlet, as shown in Providing Power to the Modem on page 2-12.

If you use the AC wall adapter for service programming the modem, make sure the power connectors of the Modem Interf ace cable are not connected to a DC power supp ly. You CANNOT have both a DC power supply and the AC adapter connected to the modem at the same tim e. This may cause the modem to fai l t o po wer up and may dam age the modem.

TO INSTALL, RUN, AND USE THE UTPST

1 2 3

■ See the Globalstar UT Program Support Tool User’s

Guide (80-98225-1) in your kit for detailed information.

Connecting the UTPST to a modem req uir es you to enter a valid six-digit Ser vice Programming Code (SPC). Use the default SPC (six zeros: 000000) unless you have been given another one.

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Caution

Tip

Re-programming Default Parameters

A GSP-1620 modem leaves the factory with a default set of service programming parameters. Before the modem can be activated in the field, you must re-program some of those defaults with valid activation values for the modem’s particular Service Provider (SP), country, and Gateway.

The first time you use t he UTPST , or before you re-pro gram any values, make a backup copy of the UTPST parameter file.

Refer to Table 3-1 for a list of key parameters you must set, then ask your SP for the values to program.

All parameters not mentioned in Table 3-1 are set either to a factory default value or to a value specified by the Service Provider. The modem will operate with those default values, but you could also re-program them, as desired, if your Service Provider so directs.

Service progr am ming parameters are stored in the mode m’s non-volatil e memory. If you connect the Diag nostic cable t o the m odem and use the UTPST to change any parameters, it is important that you de-assert the cable’s DTR (via “POS 2” on the cable’s switch) and wait at least ten seco nds before disconnecting power to the modem. Otherwise, th e service programming infor ma tion may not be saved in memory . See TO POWER OFF THE MODEM on page 2-18.

For more information about all service programming parameters, including defaults and value ranges, see the Globalstar User Terminal Service Progra mming G uide (80-98482-1).

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Service-Programming Modems

T able 3-1. Service Programming Parameters You M ust Set

Parameter / Default

Globalstar IMSI (Mobile Country Code component)

Factory default: Unprogrammed

Globalstar IMSI (Mobile Network Code component)

Factory default: Unprogrammed

Globalstar IMSI (Mobile Station Identification Number (MSIN)

Factory default: Unprogrammed

Globalstar Home Gateway Channel

Factory default: Unprogrammed

Description Action Required

for the Modem to Operate

The 3-digit Mobile Country Code (MCC) component of the Globalstar International Mobile Subscriber Identity (IMSI). The MCC component of the IMSI is generally the same as the Home Service Provider MCC (but could be different based on the activating SP’s requirements).

The 1- to 3- digit Mobile Network Code (MNC) component of the Globalstar IMSI. The MNC component of the IMSI is generally the same as the Home Service Provider MNC (but could be different based on the activating SP’s requirements).

The mobile station identification number (MSIN) component of the Globalstar IMSI.

The home gateway channel on which the modem should look for service. Can be a value from 1 through 124.

Re-program this parameter from the factory default setting to a valid MCC, in accordance with the activating SP’s instructions.

Where in UTPST: Globalstar NAM dialog

Re-program this parameter from the factory default setting to a valid MCC in accordance with the activating SP’s instructions.

Where in UTPST: Globalstar NAM dialog

Re-program this parameter from the factory default setting to a valid MSIN in accordance with the activating SP’s instructions.

Where in UTPST: Globalstar NAM dialog

Re-program this parameter from the factory default setting to a valid Home Gateway channel in accordance with the activating SP’s instructions.

Where in UTPST: Globalstar NAM dialog

Globalstar Home Gateway ID

Factory default: Unprogrammed

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A numerical identifier representing the Globalstar Home Gateway.

Re-program this parameter from the factory default setting to a valid Home Gateway ID in accordance with the activating SP’s instructions.

Where in UTPST: Globalstar NAM dialog

Integrator’s Reference Manual

T able 3-1. Service Programming Parameters You M ust Set

(continued)

Parameter / Default

Globalstar Home Service Provider Mobile Country Code (MCC)

Factory default: Unprogrammed

Globalstar Home Service Provider Mobile Network Code (MNC)

Factory default: Unprogrammed

Preferred Service Provider (Home Service Provider)

Factory default: Unprogrammed

Description Action Required

for the Modem to Operate

The 3-digit mobile country code (MCC) representing the Home Service Provider. Typically, the Globalstar Home Service Provider MCC is the same as the MCC component of the Globalstar IMSI (but could be different based on the SP’s requirements).

The 1- to 3-digit mobile network code (MCC) representing the Home Service Provider. Typically, the Globalstar Home Service Provider MCN is the same as the MCN component of the Globalstar IMSI (but could be different based on the SP’s requirements).

The Preferred Service Provider MCC and MNC is the same as the Globalstar MCC and MNC defined earlier.

Re-program his parameter from the factory default setting to a valid Globalstar Home Service Provider MCC.

Where in UTPST: Globalstar NAM dialog

Re-program his parameter from the factory default setting to a valid Globalstar Home Service Provider MNC.

Where in UTPST: Globalstar NAM dialog

Specify a Home Service Provider MCC and MNC.

Where in UTPST: Service Providers dialog

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Service-Programming Modems

Bulk-Programming Modems

If you need to service-program modems in bulk, for instance to be shipped with OEM market products, you have several options for how to do this, as shown in Table 3-2.

T able 3-2. Bulk Service-Programm ing Opt ions

Programming Option For More Informatio n

Program each modem individually, using the UTPST’s graphical user interface.

Program one modem, save the settings to a file, then re-program the remaining modems by reading in the file using the UTPST. (Note: Some manual programming would still be required, for example to enter the IMSI for each modem.)

Write scripts using the UTPST’s Application Programming Interface (API). The UTPST Scripting API is a library of functions that access the data items on a modem directly, without interacting with the UTPST user interface.

For instance, you could write a script that reads configuration values from a database, then use the UTPST Scripting API to write those values to modems.

Use another process as required by the activating Service Provider.

See the Globalstar UT Program Support Tool User’s Guide, (80-98225-1), Chapter 5, “Configuring Phone Settings”; and the Globalstar User Terminal Service Programming Guide (80-98482-1).

See the Globalstar UT Program Support Tool User’s Guide, Chapter 5, “Configuring Phone Settings,” and Chapter 6, “Saving and Transferring Phone Settings.”

See the Globalstar UTPST Script

API Reference Manual

(80-99114-1).

Ask your Service Provider for details.

Upgrading Modem Software

Sometimes it might be desirable or necessary to upgrade the software on a GSP-1620 modem. The modem contains two different kinds of software:

• Main application software — contains the true application code for the modem. All Globalstar-specific code, user interface code, and modem code resides in the application software.

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Steps

Note

• Boot block software — contains a minimal set of functionality needed to “boot” the modem (get it started).

Most software upgrades are application upgrades. Upgrading the boot block software is rarely required.

Once you obtain a software upgrade file from QUALCOMM Globalstar Customer Service, you can use the UTPST to load it onto the modem.

TO DETERMINE THE MODEM’S CURRENT SOFTWARE VERSION

1 2 3

1. Connect your PC to the modem as described in Using the

UTPST on page 3-2 and run the UTPST.

2. In the UTPST’s

Information

Phone menu, select Show Phone

The Phone Information dialog appears, including the UT Software Version Information, for example, “R5.2.0.”

TO UPGRADE MODEM SOFTWARE

1 2 3

1. Obtain a software upgrade file from QUALCOMM

Globalstar Customer Service. To contact Customer Service, see Appendix D.

2. Connect your PC to the modem and run the UTPST.

3. Follow the procedures documented in the Globalstar UT

Program Support Tool User’s Guide, Chapter 8, “Upgrading Phone Software.”

Upgrading boot bl ock software requires you to short two pins on a jumper on the modem. See the illustrati on and instructi ons in Chapter 8 of the Globalstar UT Prog ram Support Tool User’s Guide.

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4 MAKING SIMPLE DATA CALLS

Note

This chapter is essentially a quick tutorial that demonstrates making simple packet data calls from the QUALCOMM Globalstar GSP-1620 Satellite Data Modem, including the following topics:

• Checking modem status

• Making simple packet data calls

❑ Making a call from the Data port

❑ Entering Online-Command mode

This chapter assumes that you have connected your modem as described in Chapter 2 and configured necessary service programming parameters as described in Chapter 3.

In addition, examples in this chapter assume you have a Windows PC connected to the modem, where Windows deals with the TCP/IP and PPP protocols. When you develop embedded SCADA applications, you can use off-the-shelf protocol stacks or write your own.

For more detaile d inf ormation about making packet data calls, see Using Packet Data on page 5-21. For informati on about making asynchronous data calls, see Using Asynchronous Data on page 5-30.

Checking Modem Status

As you test a GSP-1620 modem and develop applications for it, you will often find it helpful to check the modem’s status.

The

AT$QCSTATUS command provides important information

about the modem, including whether it can “see” the Globalstar Gateway, how strong the Globalstar signal is,

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Steps

whether the modem has registered with the Gateway, and the current call state.

In this case, you will be able to tell whether the modem has been connected and service programmed properly, and thus has Globalstar satellite service to the Gateway.

TO CHECK MODEM STATUS

1 2 3

1. Make sure that the Control port is disconnected, either

physically or by clicking the HyperTerminal session connected to it.

2. Open a HyperTerminal session connected to the Data port as described in Setting Up HyperTerminal to Talk to the Modem on page 2-15, then type:

AT$QCSTATUS <Enter>

The modem should respond with a status report similar to the following:

SERVICE AVAILABLE: YES SERVICE MODE:GLOBALSTAR PROVIDER:<your Service Provider’s name> GATEWAY:<your Gateway’s number> RSSI:<a number from 1 to 4> REGISTRATION:<YES> ROAMING:<NO> CALL STATE:<IDLE> CALL TYPE: CALL DURATION:<0 or duration of last/current call> CALL NUMBER:<number> BATTERY CHARGE:<percentage>

Disconnect button in a

Service Status Brief Description

SERVICE AVAILABLE

SERVICE MODE Current service mode (e.g., Globalstar).

PROVIDER Current Service Provider.

GATEWAY Gateway number (in decimal).

4-2 80-99208-1 Rev. D

YES if the modem has acquired Globalstar service; otherwise NO.

Making Simple Data Ca lls

Tip

Service Status Brief Description

RSSI Received signal strength, from 0 (no signal)

REGISTRATION Current registration status of the modem

ROAMING YES if roaming. NO otherwise.

CALL STATE Current call state, e.g., IDLE.

CALL TYPE Service Option being used in the current

CALL DURATION Duration of the ongoing call or the last

CALL NUMBER Most recently called or currently calling

BATTERY CHARGE Percentage of battery life remaining.

to 4 (strong signal).

with the Gateway: NO (not registered) or YES (registered)

call (such as TIA_PPP, TIA_ASYNC, Markov, Loopback; or blank when no call is in progress).

completed call.

number.

If the modem and antenna have been set up and service programmed correctly,

RSSI should show a signal strength number other than 0, and REGISTRATION should be YES. If the modem has service and is

SERVICE AVAILABLE should say YES,

registered, you can make packet data calls. If not, see Chapter 8, Troubleshooting.

For more information about the modem status elements returned by the AT$QCSTATUS command, see Ser vice Status ($QCST ATUS) on page 6-62.

Making Simple Packet Data Calls

This section shows how to make simple mobile-originated packet data calls from the GSP-1620 modem by sending an AT command from HyperTerminal to the Data port.

In the process, you get a brief introduction to using the modem’s Data and Control ports.

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Tip

Steps

For complete detail s about m aking cal ls and u nderstandi ng modem po rt arbitration issues, see Developing Modem Applications on page 5-1.

Making a Call from the Data Port

You can make a data call by entering AT commands in HyperTerminal connected to the modem’s Data port. You will be able to see the packets streaming, just as a demonstration that the modem can make a packet data call.

TO MAKE A PACKET DATA CALL USING AT COMMANDS ON THE

1 2 3

DATA PORT

1. Make sure HyperTerminal is set up on the PC connected to the modem’s Data port, as described in Setting Up HyperTerminal to Talk to the Modem on page 2-15.

2. If HyperTerminal is connected to the modem on its Control Port, you must disconnect it before you can type AT commands on the Data port. You can leave the cable plugged into the Control port, but disconnect from the Control port using HyperTerminal (click the Phone icon).

3. In HyperTerminal, initiate the call on the Data port by typing

ATD#777.

#777 is a special number that tells the modem to establish a packet data call. HyperTerminal responds with

CONNECT. You will see random characters streaming on

the screen, with an initial tilde “~” character to indicate that this is packet data.

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Entering Online-Command Mode

Steps

Tip

While a packet data call is in progress on the Data port (the modem is in Online mode), you can interrupt the data stream so the modem will respond to AT commands. This puts the modem into Online-Command mode.

TO ENTER ONLINE-COMMAND MODE

1 2 3

1. While the data call is in progress on the Data port, in

HyperTerminal, type this escape sequence: +++ .

Making Simple Data Ca lls

HyperTerminal responds with

2. Type

AT$QCSTATUS <Enter>.

OK.

The modem responds with a status report. Notice that the

CALL TYPE field reads TIA_PPP, indicating that the data

call is still in progress

3. To terminate the call, type ATH <Enter>.

For more information abou t Online- Command mode, see Change from Online to Online-Comm and Mode (+++) on page 6-40.

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5 DEVELOPING MODEM APPLICATIONS

This chapter discusses developing market-specific software applications to work with the QUALCOMM Globalstar GSP-1620 Satellite Data Modem, particularly Remote Monitoring and Supervisory Control and Data Acquisition (SCADA) applications.

A GSP-1620 modem functions as a 9600 bps full duplex satellite modem. Applications communicate with the modem using standard “Hayes Modem” AT commands, or initialization strings.

This chapter includes the following topics:

• Recommended development tools

• SCADA application components

• Packet/asynchronous data overview

• Modem application scenarios

• Working with modem features (including using Data and

Control ports, Globalstar satellite service, Short Messaging Service, Globalstar alerts, and position location determination)

• Using packet data (including networking software and

PPP sessions, IP addressing, dormant mode, mobile-originated and mobile-terminated packet data calls, and roaming)

• Using asynchronous data (including mobile-originated

and mobile-terminated asynchronous data calls, accessing packet data over an asynchronous connection, and roaming)

• Typical modem initialization strings

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Note

Tip

For complete ref erence information about all modem-supported AT commands, including syntax, descriptions, default values, and results returned, see Chapter 6, AT Command Reference.

Recommended Development Tools

The following tools are recommended for developing GSP-1620 modem applications:

• A Windows computer — because the Modem Integrator’s Kit CD-ROM contains code samples for Windows

• HyperTerminal (or any program that talks to a serial port) for testing AT command strings

• Perl — because the code samples on the CD are written in Perl; however, you can use whatever programming language you choose (for example, C)

The CD-ROM in your Modem Int egrator’s Kit contains code samples for some typical modem application initialization strings.

SCADA Application Components

Working with a GSP-1620 modem, a SCADA application can retrieve process control and alarm data automatically from remote sites, using unmanned sensors to monitor operations and initiate alert notifications.

Figure 5-1 shows the basic components of a SCADA or OEM application that sits on top of the modem’s software, where:

• The modem serves as the DCE (data communications equipment) at the remote site.

• Your SCADA application serves as the DTE (data terminating equipment) at the remote site, communicating with software in the modem through AT commands sent to either the modem’s Control or Data ports.

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Developing Modem Applica tions

• Data flows to and from the modem over-the-air, using the

Globalstar satellites and Gateways connected to the Internet (for packet data) or to the PSTN (for asynchronous data).

• A host application (server) manages remote sites (DTEs);

for example a host application might manage data from numerous remote oil or gas wells.

Figure 5-1. DCE - DTE Application Components

Satellite

Outdoor Antenna

DCE

Remote

DTE

Data Port

SCADA Terminal

(running your

application software)

(Data or AT commands)

GSP-1620

Modem

Interface Port

Control Port (modem AT commands)

Globalstar

Gateway

Internet (for PPP data) or PSTN (for async data)

Host

Server

(Host application managing remote DTEs)

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Tip

Packet/Asynchronous Data Overview

The GSP-1620 modem handles both packet and asynchronous data connections. For a particular SCADA application, one may make more sense than the other. Table 5-1 compares the two types of data.

QUALCOMM Globalst ar p acket d ata ser vi ce has a lowe r overh ead a nd faster connection time than asynchronous data does. In general, if a SCADA application does not specifically need asynchronous data, use packet data instead.

For more details about implementation issues specific to one type of data or the other, see Using Packet Data on page 5-21 and Using Asynchronous Data on page 5-30.

T able 5-1. Packet vs. Asynchronous Dat a

Packet Data Asynchronous Data

Connects through a Globalstar Gateway to the Internet.

Packet data is transmitted over the Internet to a host server.

Typically establishes connection within 2-3 seconds.

No long distance charges apply, because a connection is made directly to the Internet.

Degradation of service (in the transmission of packets) could occur, depending on Internet connections and routing.

Connects through a Globalstar Gateway and the PSTN to a remote host modem.

Asynchronous data is transmitted to a dial-up modem or modem bank, which must be supplied by the host.

Typically establishes connection in approximately 30-60 seconds, due to modem negotiation and training time.

PSTN long distance charges may apply.

Degradation of service could occur, depending on the quality of lines over the PSTN. (A noisy PSTN line can lower the data transmission rate or introduce errors into the data stream.)

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T able 5-1. Packet vs. Asynchronous Dat a (cont inued)

Packet Data Asynchronous Data

May require a VPN and software to get past firewalls.

Mobile-terminated calls require either a fixed public IP address, or a fixed private IP address and VPN tunnel to the Gateway (see

Mobile-Terminated Packet Data Calls on page 5-27).

Modem Application Scenarios

Depending on the requirements of your SCADA or OEM application, you can configure the GSP-1620 modem to work in many different ways, using many different features. The following are sample scenarios for how the modem might work in a SCADA setting:

• Scenario 1 — Full-time packet data on-demand:

Developing Modem Applica tions

May be able to directly connect inside a firewall.

Mobile-terminated calls can be achieved by having the host modem dial the phone number of the GSP-1620 modem.

❑ The modem can both generate data or accept it from

the Gateway (see Mobile-Originated Packet Data Calls on page 5-27 and Mobile-Terminated Packet Data Calls on page 5-27).

❑ The modem uses dormant mode, where traffic

channel is automatically reestablished upon receipt of PPP traffic at the modem end or IP traffic at the Gateway end (dormant mode works for packet data only).

❑ Since the application developer is responsible for

security issues, the application might want to query for a password or answer calls only at cer tain times or only from certain phone numbers.

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• Scenario 2 — A periodic application:

❑ No auto-answer.

❑ Application powers on the modem periodically

❑ Application powers on the modem periodically and

❑ Useful where power usage is critical, perhaps due to

• Scenario 3 — Asynchronous data application:

❑ The SCADA application keeps the GSP-1620 modem

❑ A modem at the host server dials the GSP-1620

❑ The SCADA application decides whether to answer

Any of these scenarios might be appropriate, for example, for a SCADA application that monitors pipelines or gas wells, depending on how much data is generated on-site and how often the host application needs to access that data.

(perhaps once a day), queries host for data, then turns off.

sends data to the host.

limited battery charge.

powered up to accept incoming calls.

modem, which toggles the Ring Indicator (RI).

the asynchronous call or whether to call back.

As these sample scenarios show, you can configure an application for the GSP-1620 modem in many ways, depending on factors such as the following:

• How you decide to use the modem ports

• Which operating systems you use

• How you want your application to operate

• How the SP wants to handle billing (by airtime or by byte; contact your SP for details)

• Whether the application will use packet or asynchronous data connections

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Working with Modem Features

This section discusses key features of the GSP-1620 modem and how to use them programmatically in your application.

The features discussed in this section work with either packet data or asynchronous data. For packet-specific features, see Using Packet Data on page 5-21. For asynchronous-specific features, see Using Asynchronous Data on page 5-30.

Using Data and Control Ports

The GSP-1620 modem has two serial ports: one for Data and one for Control. The Data and Control ports make up the Rm interface, which is the serial interface between the DTE (your application) and the DCE (GSP-1620 modem), as shown in Figure 5-2.

Figure 5-2. DTE-to-DCE Rm Interface

Developing Modem Applica tions

Um Interface

DCE

(GSP-1620

Modem)

DTE

(SCADA

Application)

Rm Interface

Data Port

Control Port

TxD

RxD DTR DSR

RFR (RTS)

CTS

RLSD (DCD)

TxD

RxD DTR DSR

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Note

The Um interface shown in Figure 5-2 is the dedicated wireless traffic channel between the GSP-1620 modem (DCE) and the Gateway Interworking Function (IWF).

Table 5-2 shows the signal lines for each port in Figure 5-2.

The modem signal nam ing convention ass um es that the modem is the DCE and that the user applica ti on is the DTE.

T able 5-2. Port Signal Lines

Data Port Control P ort

GND - Signal Common GND - Signal Common

TxD - Transmit Data TxD - Transmit Data

RxD - Receive Data RxD - Receive Data

DTR - Data Terminal Ready DTR - Data Terminal Ready

DSR - Data Set Ready DSR - Data Set Ready

RFR (RTS) - Ready for Receive

CTS - Clear To Send

RLSD (DCD) - Data Carrier Detected

RI -Ring Indicator

For a complete desc ription of port ha rdware, including pinouts, see Data and Control Ports on page 7-6.

Data and Control Port Configurations

For a data application, you can set up the modem to use different configurations of the Data and Control ports:

• Data port only — AT commands can be sent to the modem only when there is no data session active (i.e., no data is coming across the port) or when a data session is active but the Data port is in Online-Command mode.

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Note

• Control port only — only AT commands can be sent to

modem (no data).

• Data and Control ports — the DTE can receive data on

the Data port and, at the same time, communicate with the modem on the Control port using AT commands.

The different Data and Control port configurations above are based on which ports are defined as active:

• A port is active if DTR is asserted on that port.

• A port is inactive if DTR is de-asserted on that port.

Using both the Data and Control ports allows more sophisticated communication with the modem and thus better control of it, but requires that you understand the modem’s port arbitration behavior.

In this context, port configur ation refer s to which ports on the GSP-1620 modem are active, rat her than to port baud rate, parity, et c.

Port Arbitration Behavior

This section describes the modem port arbitration behavior for each of the following port configurations:

• Data port active only

• Control port active only

• Both Data and Control ports active

When a port configuration change occurs due to a DTR change, the AT command configuration parameters maintained by the AT command processor are not modified or reset to their default values. The parameters’ current state will be associated with the newly activated port when the change occurs. An AT command in progress when DTR changes will be silently aborted.

Table 5-3 summarizes modem port arbitration behavior.

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T able 5-3. Port Arbitration Behavior

Control Port Active

Data Port Active

Port Behavior

No No Control and Data ports are inactive and modem is powered

down unless the Diagnostic port is active.

No Yes The Data port processes all data and AT commands,

including the following:

■ Online-Command mode is supported on the Data port.

■ All port configuration commands apply to the Data port

as defined in Port(s) Affected by AT Commands on page 5-13.

■ If a non-data call (e.g., Markov, Loopback) is already

active when a call is attempted with the ATD command, the BUSY result is returned. If a data call is active, a NO DIALTONE result is returned.

■ DTR cannot be used to terminate a call or enter

Online-Command state (AT&D2 or AT&D1 configurations), unless the Diagnostic port is active. Note: This is because the modem powers down if all DTRs are low. DTR can be used to terminate the call or enter Online-Command mode, although the modem will power down after approximately 1 second.

Yes No All AT commands are processed on the Control port. Data

calls are not supported because the Data port is inactive.

■ All data calls initiated using the ATD command return

NO DIALTONE.

■ ATD<phone number> returns NO DIALTONE.

■ The ATD command with #627568 (Markov test call) or

#56672225 (Loopback test call) dial strings initiates a call if a call is not already active. If a call is already active when the call is attempted, a BUSY result is returned.

■ Port configuration commands apply to the Data port

and Control port as defined in Port(s) Affected by AT Commands on page 5-13.

■ The online escape sequence “+++” surrounded by guard

time is ignored.

■ Online-Command mode command ATH returns OK.

ATH will terminate an active test call.

■ Online-Command ATO returns NO CARRIER.

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Developing Modem Applica tions

T able 5-3. Port Arbitration Behavior (continued)

Control Port Active

Data Port Active

Port Behavior

Yes Yes All AT commands are processed on the Control port. The

Data port is used only for the transfer of packet or asynchronous data resulting from a data call.

AT commands received on the Data port are ignored.

■ A packet data call can be initiated on the Data port by

sending a PPP packet; for details, see Packet No Dial ($QCPKND) on page 6-50.

■ ATD#777 received on the Control port initiates a packet

data call on the Data port. If a non-data call (e.g., Markov, Loopback) is already active when the call is attempted, a BUSY result is returned. If a data call is active, an ERROR result is returned.

■ ATD<phone number> received on the Control port

initiates an asynchronous data call on the Data port. If a non-data call (e.g., Markov, Loopback) is already active when the call is attempted, a BUSY result is returned. If a data call is active, an ERROR result is returned.

■ The ATD command received on the Control port with

#627568 (Markov test call) or #56672225 (Loopback test call) dial strings initiate a call if a call is not already active. If a non-data call is already active when the call is attempted, a BUSY result is returned. If a data call is active, an ERROR result is returned.

■ Port configuration commands apply to the Data port

and Control port as defined in Port(s) Affected by AT Commands on page 5-13.

■ Online-Command mode is not supported on the Data

port.

■ The online escape sequence “+++” surrounded by guard

time is ignored on both ports.

■ ATH received on the Control port terminates an active

data call or special test call. It returns OK whether or not a call is active.

■ ATO received on the Control port returns OK if a call is

active; otherwise, it returns NO CARRIER.

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Steps

AT Command Processing Modes

Data services AT command processing consists of three modes:

• Command mode — While in the Command mode, data service is inactive and the DCE processes AT commands received on the Rm interface.

• Online mode — Online mode is entered when a data connection is established and data service becomes active. While in the Online mode, the DCE does not recognize AT commands on the Rm interface, but does process in-band control data and software flow control data.

• Online-Command mode — During Online-Command mode, data service is in the active state, although data is not processed. The DCE processes all AT commands received on the Rm interface while in Online-Command mode.

TO ENTER ONLINE-COMMAND MODE FROM ONLINE MODE

1 2 3

■ Use an in-band control data escape sequence, “+++”

surrounded by guard time (see Change from Online to Online-Command Mode (+++) on page 6-40). or

Turn OFF the Rm interface DTR (circuit 108/2) signal (see DTE Data Terminal Ready Behavior (&D) on page 6-16 for details).

TO TERMINATE A DATA CALL FROM ONLINE-COMMAND MODE

1 2 3

■ Use the ATH command (see Hook Control (H) on page

6-22).

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Developing Modem Applica tions

Steps

TO RE-ENTER ONLINE MODE FROM ONLINE-COMMAND MODE

1 2 3

■ Use the ATO command (see Return to Online Data Mode

(O) on page 6-23).

Port(s) Affected by AT Commands

Various AT commands modify port configurations or initiate actions on a port. Since the modem has both a Data and Control port that can receive AT commands, the port affected by the received AT command is defined for each applicable port configuration. Port configuration is defined by which ports are active (DTR asserted).

Mapping the effects of an AT command to a particular port, or possibly ports, largely results from two factors: the AT command processor is single-threaded, and the Control and Data ports share a single instance of the AT command processor.

In this single instance of the AT command processor, a table defines default values and the state of each configurable parameter associated with each AT command. This default and configuration data for each command applies to one or both ports, depending on the port configuration. Most commands do not modify these configurable parameters.

Those commands that do modify parameters affect only the port processing the AT commands, with some exceptions. The exceptions, which are listed in Table 5-4 on page 5-14, are due primarily to the following unique attributes of the Data port:

• The Data port supports data (packet and asynchronous).

• The Data port supports configurable baud rate and

handshake signals.

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Nomen c la tu r e fo r Table 5-4

Table 5-4 defines the port(s) affected by AT commands that may modify parameters other than those of the active AT command port. The affected port(s) are listed for each of the following three port configurations:

• Data port active only

• Control port active only

• Both Data and Control ports active

To define the affected port(s) for each AT command listed and for each of the three port configurations, Table 5-4 uses the following nomenclature:

• DATA — Applies to Data port

• CTL — Applies to Control port

• BOTH — Applies to both Data and Control ports

• NA — Not applicable to a port with this active port configuration or not applicable to a port in general

T able 5-4. Port(s) Affected by AT Commands

Port Command Applies To:

AT Command AT Command

Description

Z Reset to Default

Configuration

&C DCE RLSD (DCD)

Behavior

&D DTE DTR

Behavior

&F Set to Factory

Defined Default

Configuration

S777 Silent Retry

Timeout

+ICF Character

Framing Settings

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Data Port Active Only

DATA BOTH BOTH

DATA DATA DATA

DATA BOTH BOTH

DATA CTL CTL

DATA NA DATA

Control P ort Active Only

Data & Control Ports Both Active

T able 5-4. Port(s) Affected by AT Commands (continued )

AT Command AT Command

Description

+IFC Local Flow Control

Settings

+IPR Rm Interface Baud

Rate Setting

+CRM Rm Interface

Protocol Setting

+CTA Dormant Mode

Timeout Setting

Port Activation (DTR) Changes during Operation

When DTR changes on the Data or Control ports, the following operational changes occur:

• Any AT command being processed on the Control or Data

ports is terminated and the port that processes AT commands, based upon the arbitration rules (see Port Arbitration Behavior on page 5-9), is placed in a state to begin processing of a new AT command.

Developing Modem Applica tions

Port Command Applies To:

Data Port Active Only

DATA NA DATA

Control P ort Active Only

Data & Control Ports Both Active

• If a call (data or special test call—Markov or Loopback) is

in progress, changes in DTR on the Control port will not terminate the call.

• If a call (data or special test call) is in progress, changes

in DTR on the Data port will terminate the call if the port is configured to do so with

AT&D2. Additionally, if none of

the DTR lines are asserted, the module will power down terminating the call regardless of the

AT&D setting (See

Power-On and Power-Off on page 7-18).

AT command configuration parameters maintained by the AT command processor are not modified or reset to their default values when a port configuration change occurs due to a DTR change. The current state of these parameters is associated with the newly activated port after the change occurs, as defined in Table 5-4.

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Note

For DTR signal timing requirements, see Changing Data and Control Port Configuration on page 7-8.

Port Use During Power On and Power Off

The Data and Control ports provide a feedback mechanism to inform the user when power on and power off are complete. The modem powers on when either or both of the ports’ DTR signals are asserted. The DSR signal is asserted on either or both active ports to inform the user that the modem has completed its start-up sequence and is ready to process AT commands.

When the DTR signals of both ports are de-asserted for approximately one second, the modem begins its shutdown sequence. When this is complete, the modem powers off and the ports’ DSR signals are de-asserted. This informs the user that power may be removed, which may be required in battery-powered applications.

The above discussion assumes that the Diagnostic port is not active. This port’s DTR signal does affect power on and power off, but the port provides no user feedback. The Diagnostic port is designed for development and service-programming use only.

For complete details of the power on and power off process, see Power-On and Power-Off on page 7- 18.

Globalstar Satellite Service

The QUALCOMM Globalstar GSP-1620 Satellite Data Modem offers full duplex (FDX) transmit and receive capabilities at 9600 bps via the Globalstar satellite constellation, and uses QUALCOMM’s CDMA digital technology for reliability.

The Globalstar Air Interface (GAI) is based on a modified (proprietary) IS-95A standard adapted for Mobile Satellite System (MSS) operations:

• Forward Link (Modem Receive): 2484.39 to 2499.15 MHz

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• Reverse Link (Modem Transmit): 1610.73 to 1625.49

Note

MHz

Short Messaging Serv ice (SMS)

The GSP-1620 modem supports IS-637 Mobile Terminated Short Messaging Service (SMS). This is a separate feature from data (packet and/or asynchronous), and may be billed differently by the Service Provider.

Mobile-terminated SMS allows the host application to “send” numeric, alphanumeric, or binary messages to the GSP-1620 modem. These messages are passed transparently out the Data or Control RS-232 ports to the DTE (SCADA application). The modem makes no attempt to construct ASCII character data. If “control” data is sent to the modem via the SMS option, it will be passed along transparently to the DTE application.

The SMS feature is fully functional even if the GSP-1620 modem is active on a data call, because SMS can be accessed on the Control port. Therefore, the host application can send command and control information to the modem either while it is in a data session, or idle (not in a call).

Developing Modem Applica tions

Check with your Globa lstar service provider to see whether the SMS feature is available.

SMS Alerts

SMS “alerts” are asynchronous messages sent out of the Data or Control port to the DTE application upon receipt of the SMS message (see Using Data and Control Ports on page 5-7 for a more detailed explanation).

Port configuration determines how SMS alerts are received:

• If the application is using the Control port, SMS alerts

are received on the Control port, even if a call is active.

• If the application is using the Data port only, the SMS

alert will be queued until the data session is terminated.

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Note

Once the DTE application receives an SMS alert, it is up to the application to read the SMS message, using the

AT$QCSMSP command.

SMS Me ssage Fiel d I n fo r mation

SMS messages can contain the following field information:

•Length of SMS

• Read status (new/read)

• Lock status

• Call back number (if available)

• Type (alpha, numeric, voice mail — these are carrier-specific fields)

• Priority (urgent, normal)

• Time received

• Message content

SMS AT Comman d s

You can use the following SMS commands:

• Navigate through SMS messages (

• Delete SMS messages (

AT$QCSMSM).

• Print/display current SMS message (

• Lock or unlock SMS messages (

• Turn on/off SMS alerting (

AT$QCSMSA).

AT$QCSMSM).

AT$QCSMSP).

AT$QCSMSL).

• Get information on SMS messages stored in memory (

AT$QCSMSI).

For more informat ion, see SMS Commands on page 6-51.

Using SMS for Mobile-Terminated Calls

You can use SMS as a way of answering mobile-terminated calls (even if the Gateway software does not yet support mobile-terminated calls).

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Developing Modem Applica tions

Note

Here is a brief description of how such a scenario might work:

• The modem is idle.

• The host application sends a short SMS message to the

modem from the Gateway, perhaps using an email account on the Internet. (A sample email address might be “

mdn@msg.globalstarusa.com.” This is an example

only. Contact your Service Provider to get the latest SMS message address format for your modem.)

• Your DTE application has set up the modem to listen for

SMS messages, in one of two ways:

❑ By turning SMS alerting on (using AT$QCSMSA).

❑ By having the DTE application poll for messages with

a timer (using the

AT$QCSMSI command).

• When the modem gets an SMS alert, it notifies the DTE

application.

• The DTE application queries the modem for the SMS

message (using

AT$QCSMSP and/or AT$QCSMSM).

• The DTE application parses the message, looking for

strings that tell it to connect to the host application.

• The DTE originates a data call (packet or asynchronous).

Once the call has been established, the modem functions simply as a “pipe” for data between the host server and DTE applications.

See the CD-ROM in your Modem Integrator’s Kit fo r a sample SMS script. Al so see SMS Commands on page 6-51.

Globalstar Service Alerts

Service alerts are sent on the Control port or queued (if only the Data port is connected and in use) whenever a service parameter changes:

• Fades — Gateway/satellite coverage is lost for any

reason.

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Note

• Acquisition — Gateway/satellite coverage is acquired (entering service, leaving service, or changing Service Providers).

• Roaming status — when the modem “roams” onto a Gateway outside the home service area (see your Service Provider for the scope of these areas).

For more informat ion, see Service Al ert ($QCSA) on page 6-61.

Service Status Message

The AT$QCSTATUS command gets the Service Status Message, which you can think of as a message detailing the information that would display on the LCD screen of the GSP-1600 Tri-Mode Phone. The Service Status Message includes the following items:

• Service available (yes or no)

•Current service mode

• Current Service Provider name

• Gateway coverage “seen” (acquired) or lack of coverage (lost)

• Received signal strength (RSSI bars on the phone display)

• Gateway registration status (“i” indicator on the phone)

• Roaming (yes or no)

• Current call state (in call/idle)

• Call type

• Call duration

For more informat ion, see Checking Mo dem Stat us on page 4-1 and Service Status ($QCSTATUS) on page 6-62.

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Position Location Determination

Note

The GSP-1620 modem has a “get position” AT command,

AT$QCPLS, that provides a latitude and longitude location as

well as a confidence value.

This command has a parameter to select between getting the current position (via making a new request) or returning the last stored position:

• If you select the current position and you are NOT in a

call, the modem returns “

• If you select the stored position and there is no stored

position (you have never done a position request), the modem returns “

For more information, see Position Location Service ($QCPLS) on page 6-66.

Using Packet Data

Developing Modem Applica tions

ERROR.”

Globalstar and the GSP-1620 modem offer direct Internet connectivity by bridging the “last thousand mile” air gap using LEO satellites. This section details the capabilities offered by the GSP-1620 modem for user connectivity and packet data transmission.

The GSP-1620 modem lets the application device (DTE) connected to the modem originate or receive a “packet data call.” It establishes a PPP session, connects to the Internet, and then establishes a session with a host application at the remote end.

For a comparison of pack et and asynchronous data, see Table 5-1 on page 5-4. For information about asynchronous data servi ce, see Using Asynchronous Da ta on page 5-30.

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Note

Data Rate and Throughput

The GSP-1620 modem offers full duplex transmit and receive at a Data port rate of 9600 bps. Discounting packet data overhead bits, the measured effective “user” throughput (that is, customer data) averages 7400 bps for packet data.

Networking Software and PPP Sessions

The modem uses PPP as the transport mechanism for data packets. Standard networking software establishes, manages, and tears down the PPP session. For example, the networking software is compatible with Dial-Up Networking (TCP/IP and PPP protocols) on Windows 95/98/NT/2000.

When you develop embedded SCADA applications, you can use off-the-shelf protocol stacks or write your own. Any standard RFC 1661 or RFC 1662 compliant stack should work.

Interoperability with Different Operating Systems

The GSP-1620 modem uses standard networking software to establish, manage, and tear down the PPP session. The modem has been tested with the following standard operating systems:

• Windows 95/98/2000

•Windows NT

•Macintosh OS

• UNIX/Linux

For Windo ws 2000, a possi ble s oft ware driver problem exist s. F or more information, contact QUALCOMM Globalstar Custom er Service, as described in Appen dix D, Product Support.

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IP Addressing for the GSP-1620 Modem

The OEM or Service Provider must choose either a dynamic or fixed Internet Protocol (IP) addressing scheme, depending on the intended use of the GSP-1620 modem:

• If the modem is expected to be mobile and roam between

Gateway service areas, a dynamic IP addressing scheme should be used. A new IP address may be assigned to the terminal equipment whenever a new packet data call is set up.

• If the unit is “fixed” in its position and no mobility is

involved, either a dynamic or fixed IP addressing scheme can be used. However, if the unit is “fixed” in its position, no mobility is involved, and the user’s application requires a fixed IP address, then a fixed IP addressing scheme should be used.

The difference is that in a “fixed” addressing scheme the user’s application at a host site or server will always know the IP address of the remote DTE (SCADA application). In a “dynamic” addressing scheme, the IP address is not known until the remote SCADA application/modem and the host/server are in an active session. In both the “fixed” and the “dynamic” addressing scheme, either the SCADA application/modem or the host/server can initiate a call/IP session.

Developing Modem Applica tions

Dynamic IP Addressing

A dynamic IP address pool in the Gateway can be configured with either private IP addresses or globally routable IP addresses. Therefore, the type of IP address assigned to a dynamic IP user during call setup depends on the Gateway configuration. With a dynamically assigned IP address, the modem can roam to another Gateway and re-establish Packet Data service by having the system automatically assign a new dynamic IP address.

With dynamic IP addressing, the modem can initiate a call/IP session with the host/server. Once a session is established, the assigned IP addresses remain constant until the session is terminated. With the added capability of dormant mode

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Note

(see Dormant Mode Service on page 5-25), the IP address assigned during this session remains active even during temporary gaps in air link coverage or when a call is temporarily released via dormant mode.

Fixed IP Addressing

Fixed IP addresses can be assigned instead of dynamic IP addresses. With a fixed IP address, the server or host application can use a given specific IP address that is permanently assigned to the modem.

In the first Gateway software release that supports modems, fixed IP addressing requires that private IP addresses be “decoded” from the modem’s IMSI (International M obile Subscriber Identity). This pre cludes the use of fixed IP addressing with roaming between Gateways.

Finding IP Addresses

If you need more information about your IP addresses, ask your Service Provider.

Virtual Pri vate Network Service

Since a fixed IP addressing scheme requires the use of private IP addresses, a virtual private network (VPN; e.g., IPSec) or an IP-in-IP tunnel would have to be established between the host and the Globalstar Gateway, so the host can initiate IP sessions with the remote/SCADA unit.

Contact your network provider for help in establishing a VPN or dedicated line between your host server and the Gateway.

When using dynamic IP addressing, an end-to-end VPN connection can be established between the remote/SCADA unit and the host/server.

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Dormant Mode Service

Steps

With dormant mode service, the Globalstar system can keep the IP session “up” at the application layer (host and SCADA applications) while dropping the air link/traffic channel, to conserve Globalstar resources and to decrease billing time to the user. The traffic channel is automatically reestablished upon receipt of PPP traffic at the SCADA application end or IP traffic at the Globalstar Gateway. The Globalstar system then completes the transmission, with no loss of user data.

Dormant mode can be entered in two ways:

Developing Modem Applica tions

• By issuing the

opposed to using the standard

ATH777 command to the Control port, as

ATH (hang up) command,

which would drop the traffic channel and terminate the PPP session.

• By using a timer. The idle timer default value is currently

0 (timer is turned off). You can specify a time between 10 and 255 seconds for the idle timer to time out and tear down the traffic channel.

During dormant mode operations, each use of the traffic channel to send and receive PPP data will produce one billing record (called a Call Detail Record or CDR).

TO SET UP DORMANT MODE AND TEST HOW THE CALL GETS

1 2 3

RE-ESTABLISHED

1. On the Control port, set the idle timer by typing:

ATH+CTA=10 <CR>.

This command sets an idle timer value of 10 seconds. Note: you can specify a termination character other than

<CR> for AT commands; see Command Line Termination

Character (S3) on page 6-25.

2. Type

AT&C0 <CR>to ensure that RLSD (DCD) will remain

asserted in dormant mode.

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Note

3. Use Dial-Up Networking to initiate a packet data call on

the Data port.

For help with Dial-Up Networking, see your Windows documentation.

4. Start a browser, go to a Web page such as

http://www.globalstar.com, and download something.

5. Wait for the data transfer to end, then wait 10 seconds for

the idle timer to expire.

On the Control port, type and immediately put the modem into dormant mode.

ATH777 <CR> to hang up the call

6. On the Control port, type

how the

CALL STATE is IDLE, indicating that the modem

AT$QCSTATUS <CR> and observe

has entered dormant mode.

7. In your browser connected to the Data port, click another link.

8. On the Control port, type how the

For the above example to work, AT&C0 must be set so that DCD remains asserted in dormant mode. Otherwise, the networking application wil l terminate the PPP session. For more information, see DCE Received Line Signal Detec tor Behavior (&C) on page 6-16. For more infor mation about dormant m ode, see Set Dormant Mode Timeout Value (+CTA ) on page 6-49.

CALL STATE is no longer IDLE.

AT$QCSTATUS <CR> and observe

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Mobile-Originated Packet Data Calls

Steps

The GSP-1620 modem lets the application device (DTE) connected to the modem originate a packet data call.

TO MAKE A MOBILE-ORIGINA TED PACKET DATA CALL

1 2 3

■ Use the ATD#777 command.

The modem returns established (for other result codes, see Dial (D) on page 6-20).

For another example, see Making a Call from the Data Port on page 4-4.

TO HANG UP A PACKET DATA CALL

1. Enter Online-Command mode by using the in-band

control data escape sequence, “ time (for details, see Change from Online to Online-Command Mode (+++) on page 6-40).

Developing Modem Applica tions

CONNECT if the call has been

+++” surrounded by guard

2. Use the

ATH command (to hang up and end dormant

mode).

Use the

ATH777 command (to hang up but leave dormant

mode active).

Mobile-Terminated Packet Data Calls

The GSP-1620 modem lets the application device (DTE) connected to the modem receive a packet data call. It is the responsibility of the DTE application to keep the modem powered up if it is to receive incoming packet data calls.

However, the first Gateway software release that supports GSP-1620 modems does not support over-the-air mobile-terminated calls. Future releases of the Gateway software will support mobile-terminated calls to fixed IP addresses, and no modem upgrades will be required.

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Tip

The following sections describe how the modem itself would deal with incoming (mobile-terminated) calls. This information is provided for developers who wish to configure their applications for mobile-terminated calls, in preparation for future releases of the Gateway software.

As an alternative to mobile-terminated calls, you can have the modem receive an SMS message, then originate a call back to the host. For details, see Using SMS for Mobile-Terminated Calls on page 5-18.

If your Service Provi der supports Caller ID, you can have the modem receive a non-pac ket-data ca ll, then origina te a call back to the host. An incoming non- pac ket-data cal l t o the DCE woul d to ggle RI an d wake u p the DTE application, which could decide whether to call back. For example, for security reasons a callback m ight be allowed only if the Caller ID number is on an approved list. Check with your Service Provider for Caller ID availability.

Answering Calls Using the Data Port Only

The Data port uses both the RI and DTR signals. How the call is answered depends on whether DTR is high or low:

• DP_DTR high (asserted) — the modem will auto-answer.

• DP_DTR low (de-asserted) — the modem will not auto-answer, but your DTE application can decide whether to answer the call by raising DP_DTR. On an incoming call, the modem asserts RI and displays RING to the appropriate port (Data port in this case).

Normally, if the application is using the Data port only and DP_DTR is low, the modem would be powered off. To power on the modem while still leaving DP_DTR low to prevent auto-answering, you can wire the DTR pin high on the Diagnostic port, instead of on the Data port.

The scenario could work like this:

• DMP_DTR is high (asserted), powering the modem on.

• RI on the Data port asserts.

• DP_DTR is low (de-asserted), meaning the modem will not auto-answer.

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Developing Modem Applica tions

• Your DTE application decides to answer the call by

asserting DP_DTR.

Different operating systems handle the DTR-DCD handshake differently. To configure it appropriately, you can use the

For more information, see DTE Data Terminal Ready

Behavior (&D) on page 6-16 and DCE Received Line Signal Detector Behavior (&C) on page 6-16.

AT&D and AT&C commands.

Answering Calls Using the Data and Control Ports

If your DTE application is using both the Data and Control ports, how the call is answered depends on whether DTR is high (asserted) or low (de-asserted) on the two ports:

• DP_DTR asserted — the modem will auto-answer.

• DP_DTR de-asserted but CP_DTR asserted — the modem

will not auto-answer, but your DTE application can decide whether to monitor RI and answer calls by raising DP_DTR. On an incoming call, the modem asserts RI on the Data port and displays RING to the Control port.

In this scenario, keeping DTR high on the Control port powers the modem, while allowing you to leave DP_DTR low to prevent auto-answering.

Roaming and Packet Data Service

The GSP-1620 modem is capable of both “fixed” operation in one location (for example, a building, tank, pipeline, or well) or “mobile” operation for applications on trucks, rail cars, aircraft, or shipping containers.

For packet data service, roaming operation has the following characteristics:

• Roaming within a Gateway service area can keep the PPP

session up the entire time, using dormant mode.

• Roaming between Gateway service areas is supported.

However, there is no hard hand-off capability between

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separate Gateways. The PPP session will be dropped and will have to be reestablished by the modem.

• Once on a new Gateway, automatic re-registration will be performed and a new dynamic IP address will be assigned to the modem.

• Roaming support for “fixed” IP addressing outside the “home” Gateway service area is not currently supported. Future design work to allow a DNS server to map IP addresses to IMSIs is envisioned, which would permit worldwide fixed IP address roaming.

If service alerts are enabled, a service alert is sent out the Data/Control port whenever the Service Provider or Gateway changes. This includes the modem changing from roaming to home service area and vice versa.

Using Asynchronous Data

The GSP-1620 modem lets the application device (DTE) connected to the modem originate or receive an asynchronous data call. It can dial or be dialed by a modem at the host server, connecting through the Globalstar Satellite Communications System and the PSTN.

Figure 5-3 shows the various modems (the GSP-1620 DCE modem, the Gateway IWF modem, and the host modem) and other components involved in an asynchronous data call.

5-30 80-99208-1 Rev. D

Developing Modem Applica tions

Note

Figure 5-3. Asynchronous Data Call Components

Satellite

Outdoor Antenna

DCE

DTE

Data Port

SCADA Terminal

(running your

application software)

(Data or AT commands)

Globalstar

GSP-1620

Modem

Gateway

Gateway IWF Modem

PSTN

Interface Port

Control Port (modem AT commands)

Server

(REMOTE end)

(HOST end)

Like most modems, the GSP-1620 modem allows you to customize asynchronous data connections, data compression, and so on. For details, see Chapter 6, AT Command Reference.

For a comparison of asynchronous and packet data, see Table 5-1 on page 5-4. For informat ion about packet data service, see Using Packet Data on page 5-21.

Host Modem

(or modem bank)

Host

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Tip

Steps

Note

Data Rate and Throughput

For asynchronous data, the GSP-1620 modem offers full duplex transmit and receive at a Data port rate of somewhat less than packet data’s 9600 bps, due to additional overhead for asynchronous data. Similarly, the measured effective “user” throughput (that is, customer data) is somewhat less than the 7400 bps (average) for packet data. Asynchronous connections take longer because of PSTN modem training time.

QUALCOMM Globalst ar p acket d ata ser vi ce has a lowe r overh ead a nd faster connection time than asynchronous data does. If your SCADA application does not specifically need asynchronous data, use packet data instead.

Mobile-Originated Asynchronous Data Calls

The GSP-1620 modem lets the application device (DTE) connected to it originate an asynchronous data call.

TO MAKE A MOBILE-ORIGINATED ASYNCHRONOUS DATA CALL

1 2 3

■ Use the ATD<dial string> command.

The modem returns

CONNECT if the call has been

established (for other result codes, see Dial (D) on page 6-20).

TO HANG UP AN ASYNCHRONOUS DATA CALL

1 2 3

1. Enter Online-Command mode by using the in-band

control data escape sequence, “

+++” surrounded by guard

time (for details, see Change from Online to Online-Command Mode (+++) on page 6-40).

2. Use the

The ATH777 command, which hangs up a packet data call and lea ves dormant mode active, will also hang up an asynchronous data call.

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ATH command.

Developing Modem Applica tions

Note

You can also hang up an asynchronous data cal l by de-assert ing DTR. However, if DTR is high on onl y one port and you then de-assert it, the modem will begin its shutdown sequence.

Mobile-Terminated Async hronous Data Calls

The GSP-1620 modem lets the application device (DTE) connected to it receive an asynchronous data call. It is the responsibility of the DTE application to keep the modem powered up if it is to receive incoming asynchronous data calls.

Here is what happens during a mobile-terminated asynchronous call:

• The host server directs a host modem to call the

GSP-1620 modem (DCE), using the Dial Number (DN) assigned to the GSP-1620 modem by the Service Provider.

• The incoming call toggles RI and displays RING to the

appropriate port.

•The

ATA command tells the GSP-1620 modem (DCE) to

answer an incoming call (for details, see Answer Incoming Call (A) on page 6-18; also see Automatic Answer (S0) on

page 6-25).

• How the modem answers the call depends on how the

ports are configured. Port behavior for incoming asynchronous calls is the same as for packet calls. For details, see Answering Calls Using the Data Port Only on page 5-28 and Answering Calls Using the Data and Control Ports on page 5-29.

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Specifications and Main Features

Frequently Asked Questions

User Manual