SNAX/APN Application Programming Manual

SNAX/APN Application Programming Manual—420111-001
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Logic Flows and Internal Formats When
Using SNALU
SNALU allows four modes of operation, which are described as follows:
•
PLU Acquire, which occurs when an application on a local system functions as a
PLU and initiates a session with an SLU on a remote node by sending a BIND to
that SLU
•
PLU Accept, which occurs when an application on a local system functions as a
PLU and accepts a session initiation request (CINIT) as the read portion of a
WRITEREAD procedure call from an SLU on a remote node
•
SLU Acquire, which occurs when an application on a local system functions as an
SLU and initiates a session with a PLU on a remote node by sending an INITSELF
or character-coded logon request to that PLU
•
SLU Accept, which occurs when an application on a local system functions as an
SLU and accepts a BIND from a PLU on a remote node
This section provides illustrations of communication between Tandem applications and
remote devices with SNAX/APN when using SNALU. The following subsections
illustrate examples of session initiation when using each of the aforementioned modes of
operation.