Envoy Application Programming Manual
Table Of Contents
- What’s New in This Manual
- About This Manual
- 1 Application Programming With Envoy
- 7 ADM-2 Multipoint Supervisor Protocol
- 8 TINET Multipoint Supervisor Protocol
- 9 Burroughs Point-To-Point Protocol
- 10 Asynchronous Line Supervisor Protocol
- A ASCII Character Set
- B ASCII to EBCDIC Code Conversion
- C File-System Procedures
- D Statistics Messages
- E S-Series Changes to Envoy
- NonStop™ Himalaya S-Series Server Architecture
- G-Series Migration Considerations
- CBSENSEON and CFSENSEON Modifiers
- LEOTRESYN and NOLEOTRESYN Modifiers
- Treatment of Characters After the Termination Character
- Number of SYN Characters
- DTR Drop
- Reporting of Parity Error
- Half-Duplex Support for Asynchronous Lines
- Controller Replacement
- SYSGEN and COUP
- Unit Numbers
- FDX Line Changes
- No Support for Auto-Call Unit
- Glossary
- Index
BISYNC Point-To-Point Protocol
Envoy Application Programming Manual—427159-001
3-54
Use of Reverse Interrupt (RVI)
Example 3-21. RVI Sequences
Local (sender) Remote (receiver)
CALL READ
CALL WRITE |
| message --> (READ completes)
| error = 0
| line state = READ
|
| CALL READ
(WRITE completes) <-- ACK0 |
error = 0 |
line state = WRITE |
|
CALL WRITE |
| message --> (READ completes)
| error = 0
| line state = READ
|
| (receiver transmits
| a message)
|
| CALL CONTROL 15
|
| CALL READ
(WRITE completes) <-- RVI |
error = 165 |
line state = WRITE |
|
(sender relinquishes |
the line) |
|
CALL READ |
| EOT --> (READ completes)
| error = 163
| line state = CONTROL
|
| (receiver now bids
| for the line)
|
| CALL WRITE
| <-- ENQ |
| ACK0 --> |
(READ completes) <-- message 1 |
error = 0 v