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
4-41
Initial WRITE Operation
Initial WRITE Operation
Figure 4-8 lists the action of the supervisor station in response to line conditions on an
initial WRITE, but prior to the first message being sent.
Figure 4-8. BISYNC Multipoint Supervisor Initial WRITE
031CDT .CDD
Send selection
address
CALL WRITE...
2
No
No
Wait for Response
Error = 165
Timeout?
No
Yes
No
MPWACKSEL
option?*
Text with
Error?
Text
Overrun?
Yes
Retry
Count = 0?
Error
= 177
Yes
Retry
Count = 0?
Error
= 177
Yes
Retry
Count = 0?
Error
= 171
WACK Recd?
Yes
Incorrect
ACKn?
EOT Recd?
ENQ Recd?
Yes
Send ENQ
NAK Recd?
Protocol
Error?
ACKD Recd?
Retry
Count = 0?
Retry
Count = 0?
Error
= 169
RVI
Recd?
Yes
Yes
Yes
No
No
No
Yes
No
See
Continuation
WRITE
Yes
No
No
No
No
No
Yes
Yes
Yes
No
No
Yes
Yes
No
No
* MPWACKSEL is a system startup option
Error
= 172
Error
= 172
Error
= 167
Error
= 168
Error
= 167