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
ADM-2 Multipoint Supervisor Protocol
Envoy Application Programming Manual—427159-001
7-16
Poll State
Poll State
Each address in the poll list has an associated poll-state bit. The poll-state bit is in the
most significant bit position of the first element of a station address; that is, station
address.<0.> Table 7-5
shows the meaning of the poll-state bit setting.
By means of the poll-state bit, an application process can selectively designate whether
terminals in the poll list are to be polled.
The poll state for terminals is specified in either of two ways:
•
The poll states for all terminals are indicated by their poll-state bits in the address
list before the DEFINELIST procedure is called, or
•
The CHANGELIST procedure is called to alter a specific terminal’s poll state after
the DEFINELIST procedure has been called
Example of Selective Polling (Before Calling DEFINELIST)
The programming Example 7-6 shows how to disable polling for a specific terminal by
means of the poll-state bit in the address list.
Table 7-5. Poll-State Bit Meanings
Poll-State Bit Equivalent Meaning
0 enable polling The associated terminal is polled when a poll sequence
is initiated
1 disable polling The associated terminal is not polled