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
Software Concepts
Envoy Application Programming Manual—427159-001
2-15
Multipoint Operation
Multipoint Operation
Figure 2-4 shows the use of file-system procedures, error returns, and the effects of the
various line states in a multipoint configuration.
Three NonStop™ Himalaya servers are connected to each other over a nonswitched
multidrop line. An application process in one system acts as the supervisor station. The
application processes in each of the other two systems act as tributary stations.
Figure 2-4. Multipoint Connection
013CDT .CDD
Nonswitched
Point-to-Point Line
$BSC1 $LINE1
Application
Process No. 1
Server A
Supervisor Station
Application
Process No. 2
Server B
Application
Process No. 3
Server C
Tributary Stations
$TRIB1
Poll Address =
BPOL
Select Address =
2SEL
Poll Address = CPOL
Select Address = 3SEL