Envoy ACP/XF Application Programming Manual

EnvoyACP/XF Application Programming Manual–132179
iii
Contents
About This Manual ix
Notation Conventions
xiii
1. EnvoyACP/XF and the Application Task
File-System Procedures 1-2
Definition of Station
1-3
Primary Station
1-3
Secondary Station
1-3
Combined Station
1-3
Application Tasks
1-4
Opening a Line
1-4
Multiple FILE_OPEN_ Calls
1-5
Multiple Pending Nowait Operations
1-6
Setting Line-Configuration Parameters
1-7
Establishing and Controlling a Data Link
1-8
Line Ready Considerations
1-9
Transferring Data
1-10
Message Control Word
1-10
WRITE, READ, and WRITEREAD Requests and Nowait I/O
1-10
Shutting Down a Data Link
1-12
Closing a Line
1-12
Recovering From Errors
1-12
Automatic Calling for V.25 bis Modems
1-13
V.25 Modifier
1-13
V.25 bis Restrictions
1-13
V.25 bis Features
1-13
Your Application and V.25 bis
1-14
2. Asynchronous Balanced Mode (ABM) Protocols
ABM Features 2-1
ABM Link-Level Commands
2-2
Contention Resolution
2-2
ABM Link-Level Responses
2-3
ABM Inactive States
2-3
ABM Application Process Interface
2-4
Opening a Line
2-5
Setting Line Capability Characteristics
2-5
Address Verification
2-5