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
Envoy Application Programming Manual—427159-001
Glossary-1
Glossary
$ZZLAN. The process name of the ServerNet LAN systems access (SLSA) subsystem
manager process that is started by the $ZZKRN Kernel subsystem manager process and
maintained by the $ZPM persistence manager process. See also LAN manager
(LANMAN) process.
$ZZWAN. The process name of the wide area network (WAN) subsystem manager process.
3602. A communications controller supporting Envoy byte-synchronous protocols in CLX
and Cyclone systems. This controller works only with Envoy.
3603. A communications controller supporting Envoy asynchronous protocols in CLX and
Cyclone systems. This controller works only with Envoy.
address list. In a supervisor station, the address list consists of the poll address of any
stations to be polled, followed by the select addresses of those stations. In a tributary
station, the address list contains the poll addresses and select addresses to which the
station responds. See also poll address and select address.
affirmative acknowledgment (ACK, ACK0, ACK1). The replies (data link escape (DLE)
sequences in byte-synchronous communications) indicating that the previous
transmission block was accepted by the receiver and that it is ready to accept the next
block of the transmission. The corresponding negative response is NAK. The use of
ACKO and ACKl alternately provides sequential checking control for a series of replies.
ACKO is also an affirmative (ready to receive) reply to a station selection (multipoint),
or to an initialization sequence (line bid) in point-to-point operation.
ASCII. American National Standard Code for Information Interchange. (1) A method of
coding data, consisting of 7 bits for each character plus a parity bit. Designed for
synchronous or asynchronous use, the code has 128 standard characters. (2) An 8-bit
code representing characters and control codes. One of two major codes used to
represent and exchange data (the other is EBCDIC).
asynchronous data transmission (ASYNC). A mode of data communications transmission
in which characters are sent at random. There is no timing relationship between the end
of one character and the start of the next. Within each character, a fixed bit duration is
determined by the internal clock speeds of both the transmitting and receiving terminals.
A character code defines terminal and line-control sequences. Asynchronous
environments support the ASCII code. See also byte-synchronous data transmission.
baud. (1) A unit of data transmission speed. Baud rate is the rate of signal-event
transmission. A signal event may represent more than 1 bit.
block-check character (BCC). An accumulation of characters transmitted as the last
character in the block. The transmitted BCC is compared with the accumulated BCC
character at the receiving station for an equal condition. An equal comparison indicates a
good transmission of the previous block. Used by byte-synchronous protocols to assure
data accuracy within a transmission block.