Envoy Application Programming Manual

BISYNC Point-To-Point Protocol
Envoy Application Programming Manual—427159-001
3-2
Envoy BISYNC Features
•
Allows a conversational reply to a conversational reply
Details of the Envoy-SWIFT protocol are discussed under Envoy-SWIFT Considerations
on page 3-3.
Envoy BISYNC Features
The Envoy BISYNC point-to-point protocol offers the following features:
•
ASCII or EBCDIC line code
•
Primary-secondary contention resolution
•
Automatic check-character generation, verification, and retry for erroneous
operations
•
Data-link control
•
Automatic timeouts for all line operations
•
Limited and multileaving conversational modes
•
Circuit Assurance Mode (ID exchange) for switched lines
•
Support for the message formats shown in Table 3-1 and Table 3-2.
The conversational multileaving mode of the BISYNC point-to-point protocol
(excluding SWIFT) also supports the message formats in Table 3-2
.
Table 3-1. BISYNC Point-to-Point Formats
BISYNC Point-to-Point Format
heading SOH—head—ETB BCC
heading-text SOH—head—STX—text—ETB|ETX BCC
text STX—text—ETB|ETX BCC
transparent text (excluding BCC SWIFT) DLE STX—text—ETB|ETX BCC
or
SOH—head—DLE STX—text—ETB|ETX
intermediate blocked text (excluding BCC
SWIFT)
STX—text—ITB BCC—text—ETX BCC
or
DLE STX—text—ITB BCC—text—ETX
Table 3-2. Conversational Multileaving Mode Formats
Conversational Multileaving Mode Format
idle acknowledgment DLE ACKD
error acknowledgment NAK
synchronization requests SOH ENQ EOT