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
TINET Multipoint Supervisor Protocol
Envoy Application Programming Manual—427159-001
8-22
Line Action by Procedure Call
Line Action by Procedure Call
This subsection describes the TINET control sequences transmitted because of calls to
file-system procedures. The actions of file-system procedures in response to line states
and the reception of selected control sequences are also described.
This subsection includes:
•
READ Procedure on page 8-22
•
WRITE Procedure on page 8-23
•
CONTROL Procedure (Send EOT) on page 8-25
•
CONTROL Procedure (Send ENQ) on page 8-25
•
CONTROL Procedure (Send CAN) on page 8-25
READ Procedure
The READ procedure is used to initiate the polling sequence and to read a message from
a terminal (Example 8-10
).
A READ causes Envoy, on behalf of the application process, to begin polling all
addresses in the poll list. If a terminal does not have a message to send, it responds with
an EOT and polling continues to the next station in the poll list.
Polling continues until a station responds with a message, an error occurs (such as a
nonresponding station), or the specified number of passes through the poll list have been
made. Upon successful receipt of a message from a terminal, a condition code of CCE is
returned. The address list entry number of the terminal that responded with a message is
returned in the message control word, bits 8:15.
Example 8-10. TINET Polling Procedure
Application Process TINET Terminal
CALL READ(...)
| EOT EOT idp ENQ -->
| <-- EOT
| EOT EOT idp ENQ -->
| <-- EOT
| .
| . .
| . .
| .
| EOT EOT idp ENQ -->
| <-- message
(READ completes)
error = 0
Envoy<8:15> contains entry number for station "n"