Envoy Application Programming Manual

BISYNC Point-To-Point Protocol
Envoy Application Programming Manual—427159-001
3-51
Limited Conversational Mode
Example 3-19. Read Messages from the Remote Station
Local Remote
(format message with ETB)
CALL READ CALL WRITE
| <-- ENQ |
| ACK0 --> |
(READ completes) <-- message with ETB |
error = 0 |
line state = READ |
|
CALL READ |
| ACK1 --> (WRITE completes)
| error = 0
| line state = WRITE
| (format message with ETB)
| CALL WRITE
(READ completes) <-- message with ETB |
error = 0 |
line state = READ |
|
CALL READ |
| ACK0 --> (WRITE completes)
| error = 0
| line state = WRITE
| (last message: format
| message with ETX)
|
| CALL WRITEREAD
(READ completes) <-- message with ETX |
error = 0 |
line state = READ |
|
(format reply message |
CALL WRITEREAD |
| message --> (WRITEREAD completes)
| error = 0
| line state = READ
|
| CALL READ
(WRITEREAD completes) <-- ACK0 |
error = 0 |
line state = WRITE |
|
CALL READ |
| EOT --> (READ completes)
| error = 163
| line state = CONTROL
(READ completes)
error = 162
line state = CONTROL