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D     Real-Time Data and Services
114     SPSx50 and SPSx51 Modular GPS Receivers User Guide
RT17 Streamed Data service
An RT17 service provides GPS observations, ephemerides, and other information, as 
defined for that service. When a “client” connects to the service, all data flow is from 
the Smart GPS antenna to the client.
Login authentication
If you interface to the receivers using binary commands over serial communications, 
you may need login authentication. This has been added to most SPSx51 and SPSx81 
receiver models that run firmware version 3.30 or later. 
If your utilities such as the WinFlash utility or the Configuration ToolBox software do 
not work with the receivers running firmware version 3.30 or later, then go to the 
Trimble website and download the latest versions of these utilities. If your own 
application software no longer communicates with the receiver, please contact 
Trimble Support for information about how to use the receiver in these cases.