User`s guide

46 DC 900-1340I
BSC Programmer’s Guide
• Appendix D explains error handling and provides a summary table of BSC error
codes. The Freeway Data Link Interface Reference Guide gives complete DLI error
code descriptions.
• The Freeway Data Link Interface Reference Guide provides a generic code example
which can guide your application program development, along with the program
described in Appendix E of this manual.
• Appendix F provides detailed command and response header formats.
3.1 Summary of DLI Concepts
The DLI presents a consistent, high-level, common interface across multiple clients,
operating systems, and transport services. It implements functions that permit your
application to use data link services to access, configure, establish and terminate ses-
sions, and transfer data across multiple data link protocols. The DLI concepts are
described in detail in the Freeway Data Link Interface Reference Guide. This section sum-
marizes the basic information.
3.1.1 Configuration in the Freeway Environment
Several items must be configured before a client application can run in the Freeway
environment:
• Freeway server configuration
• data link interface (DLI) session configuration
• transport subsystem interface (TSI) connection configuration
• protocol-specific ICP link configuration
The Freeway server is normally configured only once, during the installation proce-
dures described in the Freeway Server User’s Guide. DLI session and TSI connection