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80-99208-1 Rev. D 5-1
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