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
7-17
Nonresponding Terminal List
In this example, terminal 2 ("22p") is not polled when polling is initiated.
Example of Selective Polling (After Calling DEFINELIST)
The following example shows how to enable polling for a specific terminal by means of
a call to the CHANGELIST procedure. The terminal to be enabled for polling is
terminal "22p" in the above example.
CALL CHANGELIST (linefnum,1,0); ! enable polling for entry 1.
In this example, terminal 2 ("22p") is polled on the next pass through the poll list.
Nonresponding Terminal List
The nonresponding terminal list is a list, internal to Envoy, that Envoy uses to keep track
of terminals that do not respond to polling. If a polled terminal does not respond with
either an EOT sequence or a message within the timeout period specified for the line, its
address is entered into the nonresponding terminal list. Terminals in the nonresponding
terminal list are referred to as being partially disabled. Partially disabled terminals are
not polled when a poll sequence is performed.
Terminals are removed from the nonresponding list and returned to polling state, in
either of two ways:
Example 7-6. Disable Polling for a Specific Terminal
LITERAL
addr^size = 3, ! address size in words.
num^entries = 6, ! number of address-list
!entries.
NULL = 0, ! ASCII NULL character.
EOT = 4, ! ASCII EOT character.
ENQ = 5, ! ASCII ENQ character.
poll^count = 3, ! number of poll-list entries.
no^poll = %200; ! used to set poll-state bit.
STRING
.saddr^list[ 0 : addr^size * num^entries * 2 - 1] :=
! address list.
[NULL, EOT, "11p", ENQ, ! terminal 1 poll.
no^poll + NULL, EOT, "22p", ENQ, ! terminal 2 poll.
NULL, EOT, "33p", ENQ, ! terminal 3 poll.
NULL, EOT, "11q", ENQ, ! terminal 1 select.
NULL, EOT, "22q", ENQ, ! terminal 2 select.
NULL, EOT, "33q", ENQ] ; ! terminal 3 select.
INT .addr^list := @saddr^list ’>>’ 1; ! redefine as INT
!array.
CALL DEFINELIST (linefnum,addr^list,addr^size,num^entries,
poll^count,poll^type);
IF < THEN ...