Lexmark TN3270E 用户手册

This Network Setup > Server Info option specifies the time in sec-
onds that expires between each keep alive signal sent to the host or 
SNA gateway server. The 

of signal sent to the host.

Set this option to a value smaller than the session’s inactivity time-
out value defined on the host. The host parameter name is 
KEEPALIVE OPTIONS. It resides in the host IP profile dataset: 

SYS1.TCPPARMS(PROFILE)

.

 is set to None.

The range is 1 to 32000 seconds.