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
4-43
Continuation WRITE Operation
Continuation WRITE Operation
Figure 4-9 shows the action of the supervisor station in response to line conditions on a
continuation WRITE and the first message being sent on an initial WRITE.
Figure 4-9. BISYNC Multipoint Supervisor Continuation WRITE
032CDT .CDD
Send Message
CALL WRITE...
2
No
No
Wait for Response
NAK
Received?
No
Yes
No
MPWACKTEXT
option?*
Text
Overrun?
Timeout?
Yes
Retry
Count = 0?
Error
= 171
Yes
Retry
Count = 0?
Error
= 177
WACK Recd?
Error
= 174
Yes
Yes
No
No
Yes
No
* MPWACKTEXT is a system startup option
Send ENQ
Retry
Count = 0?
Yes
No
Incorrect
ACKn?
RVI Recd?
EOT Recd?
ENQ Recd?
Proper
Protocol?
Correct
ACK?
Retry
Count = 0?
Retry
Count = 0?
No
No
No
Yes
No
Error
= 172
Error
= 175
Error
= 165
Error
= 166
Error
= 163
No
Yes
No
Yes
Error
= 0
Yes
Yes
No
Yes
Yes
Yes
Error
= 173
Yes