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80-99208-1 Rev. D 1-5
Figure 1-2. Typical Modem SCADA Application Using
Asynchronous Data
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.
Satellite
Globalstar
Gateway
Server
GSP-1620
Modem
SCADA Terminal
Control Port
Data Port
DTE
DCE
Tx
Rx
Host
Outdoor Antenna
PSTN
Gateway IWF Modem
Host Modem
Remote