6100 MPS-B Programming Manual

WRITING APPLICATIONS THAT USE 6100 MPS-B
WRITE Examples
WRITE Example 2 (Continued)
Write a message to the station which responds with NAK prior to
accepting a message from a station (FAST SELECT):
Application Process MPS-B Station
Line State = READ
CALL WRITEREAD (...);
|
| ACK --->
|
| <--- EOT
|
| EOT a1 a1 s STX text ETX --->
|
| (error)
|
| <--- NAK
|
| (text re-transmission)
|
| STX text ETX --->
|
| <--- NAK
|.
|.
|.
|
| STX text ETX --->
|
| <--- NAK
|
| (number of retries exceeded)
|
(WRITEREAD completes)
Line State = CONTROL
Status = 168 (NAK in response to the transmission error)
Text In = 0
3-62