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 Multipoint Tributary Protocol
Envoy Application Programming Manual—427159-001
5-10
File-System Procedures
WRITE
Transmits data to the supervisor station. A call to WRITE completes when the
supervisor station acknowledges the message.
WRITEREAD
Performs limited conversational-mode transmissions. Limited conversational mode,
in accordance with the BISYNC protocol, permits a receiving station to return text
in response to a message that ended with ETX instead of returning the normal
positive acknowledgment. According to the BISYNC protocol, the receiving station
is permitted to return text only once before it must resume the normal ACK0/ACK1
response sequence. The station receiving the conversational reply is not permitted to
respond with a conversational reply.
WRITEREAD is used by a tributary station, following its selection, to receive a
conversational reply. The call to WRITEREAD sends a message to the supervisor
station, then reads a reply message, an ACK sequence, or an EOT from the
supervisor station (if a message is returned, it is returned to the buffer specified for
WRITEREAD).
Table 5-4. SETMODE Operations for BISYNC Multipoint Tributary
Operation Parameter Description
15 1 Sets timeout duration in 10-millisecond units.
2 Sets number of times to retry.
16 1 Sets line type.
.<14:15> 2: Specifies multipoint tributary.
3: Specifies multipoint supervisor.*
17 1 Specifies intermediate block size in words.
18 1 Sets statistics threshold
*If SETMODE 16 is used to change the line from tributary to supervisor, the LEADEOT modifier should be
specified in the SYSGEN configuration. Also SETMODE 16, param 2 can be used to specify the polling inter-
val for a multipoint supervisor; it is not used by a multipoint tributary.
Note. For a complete list of SETMODE procedures supported by the Envoy protocols, see the
SETMODE procedure description in Ta ble C-5 on page C-27, which also lists the analogous
modifier for these procedures.