6100 BSC Programming Manual

Writing Applications that Use 6100 BSC
SETMODE Request and Response
The SETMODE request is used to change the retry count for the
line or the block length for transparent text. (The
corresponding SYSGEN parameters are BSCRETRIES and BSCITBSIZE.)
A reason to use this request might be that the station is called
by several stations with different buffer sizes, or that changes
in line quality demand more leniency of the protocol. By raising
the retry count, you might reduce the number of failed requests.
The request is allowed at any time after configuration, except
that it follows the rule on concurrency: only FETCH STATISTICS
or FETCH CONFIGURATION can be active at the same time. (Notice
that these restrictions guarantee the line to be idle.) The
SETMODE request has no effect on the state of the line.
The request buffer format is:
Function := 68
Modifier := 0 to change the retry count
1 to change the block length
Request ID := A unique value from 1 to 32767,
application-dependent
Text Out := 2
Text In := Doesn't matter
Text := The new retry count or block length, subject
to the same restrictions as in SYSGEN
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