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Lassen-SK8 Embedded GPS Module 3-3
Software Interface
3.4 Protocol Summary
The Lassen-SK8 receiver is shipped from the factory with the following configuration:
• TSIP
- 9600 baud 8-odd-1 on Port 1
• NMEA out/RTCM in
- 4800 baud 8-none-1 on Port 2
The receiver can easily be reconfigured for other combinations of language and port baud
rate and parity. These settings are kept in BBRAM (Battery Backed Random Access
Memory) and can be saved into non-volatile memory if desired. The commands include:
• TSIP command: 0xBC
• TAIP command: PT
Refer to Appendix A.3, Customizing Receiver Operations, for additional information on
protocols.
If the receiver is not talking to application programs, the ports may be configured to an
unknown setting. Use the following Toolkit program commands to return the receiver to
the factory default setting:
• TSIP: SK8BREAK
• TAIP: SK8TAIP
3.4.1 TSIP Data Output
The Trimble Standard Interface Protocol (TSIP) is the native language for the Lassen-
SK8. TSIP is a binary language, with a wide variety of commands and reports. TSIP
reports can be output automatically, or they can be output as responses to queries. The
format of the automatic reports can be easily configured. Refer to Appendix A.3,
Customizing Receiver Operations and Appendix A.4, Automatic Position and Velocity
Reports for further information. The receiver is shipped from the factory configured for
single precision Latitude-Longitude-Altitude. Customized position and velocity formats
can be created by using the information in Appendix A.3, Customizing Receiver
Operations.
The TSIPCHAT program in the Lassen-SK8 Starter Kit permits using a computer keyboard
to send the Request Packets to the GPS receiver. The responses to these requests are then
displayed on a DOS computer screen in ASCII format. C source code routines for the
TSIPCHAT program are also provided in the Starter Kit. C source can be used as a
software design guide by programmers who need to communicate system integration
information with the Lassen-SK8.