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 Centralized Multipoint Supervisor Protocol
Envoy Application Programming Manual—427159-001
4-39
Continuation READ Operation
Continuation READ Operation
Figure 4-7 shows the action of the supervisor station in response to line conditions on a
continuation READ.
Figure 4-7. BISYNC Multipoint Supervisor Continuation READ
030CDT .CDD
No
EOT
Received?
Retry
Count = 0?
Retry
Count = 0?
Send ACKn or RVI
to Previous
Message
CALL READ...
Wait for Message
No
ENQ
Received?
TTD
Received?
BCC Error?
No
No
Yes
No
No
Text
Overrun?
Yes
Retry
Count = 0?
Yes
Error = 177
1
Send NAK
Error = 173
Error = 172
Send NAK
Error = 163
Repeat Last Reply
Error = 0
Yes
No
No
Timeout?
Error = 162
Yes
Retry
Count = 0?
Yes
Yes
Yes
Send NAK
Protocol
Error?
Yes
Retry
Count = 0?
Yes
Valid
Message?
Yes
No
No No
No
Yes
Yes