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 Point-To-Point Protocol
Envoy Application Programming Manual—427159-001
3-8
File-System Procedures
File-System Procedures
The application process uses the following Guardian 90 file-system procedures to
interact with Envoy and to communicate with a remote BISYNC point-to-point station:
AWAITIO
Waits for completion of an outstanding nowait I/O operation.
CLOSE
Terminates access to a data communications line.
CONTROL
Performs various line control operations, as shown in Table 3-5.
DEVICEINFO
Returns the device type and configured record length for a line.
FILEINFO
Returns error information and characteristics about an open line.
Table 3-5. CONTROL Operations for BISYNC Point-to-Point
Operation Parameter Description
11 Enables connection by setting the data terminal ready (DTR)
signal and waits for data set ready (DSR) *
13 Sends EOT (end of transmission)
14 Sends WACK (wait for acknowledgment)
15 Enables RVI (reverse interrupt)
16 Sends TTD (temporary text delay)
17 1 0: Enables connection by setting DTR*
1: Enables connection by setting DTR and waits for DSR*
18** Disables connection by clearing DTR
19** Sends DLE EOT (disconnect sequence), then clears DTR
20 Monitors the line (without READ); incoming control
characters are indicated by file-system errors
* CONTROL 11 and CONTROL 17,1 = 1 perform the same function.
** Clears data terminal ready only if DTROFF modifier was specified when issuing the
ADD DEVICE command.