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
4-31
WRITE Procedure
Continuation WRITE (Line in WRITE State)
All WRITEs following the initial one are continuation WRITEs. A continuation WRITE
(Example 4-11) causes Envoy, on behalf of the application process, to send the message
in the buffer of the application process to the selected tributary. The call to the WRITE
procedure completes when the tributary acknowledges the message. The successful
transmission of a continuation message is indicated by a condition code of CCE upon
completion of the WRITE. Following the transmission of a continuation message, the
line is in the WRITE state.
165 RVI received. The tributary transmitted a reverse
interrupt sequence as a positive acknowledgment
to the message.
WRITE
166 ENQ in response to selection. CONTROL
167 EOT in response to selection. The tributary
rejected the selection.
CONTROL
168 NAK in response to selection. CONTROL
169 WACK in response to selection. CONTROL
171 No response to selection. The selection was
attempted the number of times specified by the
retry value.
CONTROL
172 Reply not proper for protocol. The data received
during selection or when the message was trans-
mitted was not proper for the BISYNC protocol.
CONTROL
173 Transmission error. A NAK sequence in response
to the text has been received the number of times
specified by the retry value.
174 WACK received. A WACK sequence was received
as the text acknowledgment.
CONTROL
175 Incorrect acknowledgment received. An ACK1
was received on the selection or an ACK0 was
received on text.
WRITE
177 Text overrun on selection. The length of the
response received exceeds two characters (text
was received rather than a control character). The
selection or transmission has been attempted the
number of times specified by the retry value.
CONTROL
Text overrun on a message. WRITE
Table 4-12. Initial WRITE File-System Errors (page 2 of 2)
Error State Description Resultant Line State