Envoy ACP/XF Application Programming Manual

Asynchronous Balanced Mode (ABM) Protocols
EnvoyACP/XF Application Programming Manual–132179
2-4
ABM Application Process Interface
ABM Application Process Interface
The application process controlling an EnvoyACP/XF ADCCP-ABM and HDLC line
interacts with the data link through:
•
Calls to Guardian file-system procedures
•
Condition codes (CCG, CCE, and CCL) returned by the procedures and numerical
error codes returned by the FILE_GETINFO_ procedure
•
Application-level data exchanged by way of I-frames
Section 4, System Procedure Call Specifics for EnvoyACP/XF
, summarizes the Guardian
file-system procedures for EnvoyACP/XF, and Appendix A, File-System Errors
,
Figure 2-2. Disconnected Versus Offline States
012
Primary/
Combined
Station
Secondary/
Combined
Station
SABM (Address 2)
DM (Address 2)
Local Combined
Station
Remote Combined
Station
Disconnected
State
SABM (Address 2)
UA (Address 2)
Local Combined
Station
Remote Combined
Station
Off-Line
State
Primary/
Combined
Station
Secondary/
Combined
Station
Secondary/
Combined
Station
Secondary/
Combined
Station
Primary/
Combined
Station
Primary/
Combined
Station