SNAX/APN Application Programming Manual

Contents
SNAX/APN Application Programming Manual—420111-001
iii
4. The SNALU Interface
4. The SNALU Interface
SNALU Interface and SNA 4-1
SNALU Message Format
4-2
SNAX Header
4-3
Sending and Receiving BIUs: WRITEREAD Procedure
4-5
Two-Step Read Operations (QRI Usage)
4-7
Other File-System Procedures
4-8
SNALU Application as PLU or SLU
4-9
Session Phases
4-10
Initiating LU-LU Sessions
4-11
Starting the LUs
4-11
Opening an LU
4-11
SNALU Application Initiates Session with Remote SLU
4-12
Remote SLU Initiates Session With SNALU Application
4-14
SNALU Application Initiates Session With Remote PLU
4-14
Remote PLU Initiates Session With SNALU Application
4-17
BIND Image Processing
4-17
Exchanging Data
4-17
Sequence Numbers
4-17
Normal/Expedited Flows
4-18
Flow Control
4-19
Chaining
4-19
Request/Response Modes
4-19
Brackets
4-20
Send/Receive Modes
4-20
Pacing
4-21
Terminating LU-LU Sessions
4-21
SNALU Application Terminates Session With Remote SLU
4-21
SLU Initiates Termination of Session
4-24