Defining SNA/CCS to VCNA

The VCNA START parameters that relate to SNA/CCS are described below. They are all operands of the DTIGEN macroinstruction, which is optional.

CCSMLM

specifies the CP message limit. This is the maximum number of messages to be specified on the IUCV ACCEPT request.

LGNCMDS

specifies the CP commands that are valid before logon.

PACE

specifies the pacing value for communication between VM/VCNA and CP. This value is the maximum number of I/O requests per terminal from CP to VM/VCNA before VM/VCNA must return a pacing response. It is provided to prevent a buffer overrun in VM/VCNA.

RDSPTMR

specifies the redisplay timer value in sixteenths of a second. CP uses this value to force VM/VCNA to redisplay data entered and to unlock the keyboard after the prescribed time has elapsed.

TIMEINT

specifies an interval in seconds that VM/VCNA uses to determine how often timer functions such as MORE, HOLDING, and NOT ACCEPTED are to be performed. A smaller value gives greater accuracy with more timer overhead.

VCNAMLM

specifies the IUCV VM/VCNA message limit. This limit is the maximum number of messages specified by VM/VCNA on the IUCV CONNECT request.