OPTO 22 SNAP-PAC-R1 User Manual page 77

CAUTION: Note the following recommended settings:
TCP Minimum Retransmission Timeout (msec):
TCP Initial Retransmission Timeout (msec):
TCP Retransmission Attempts:
TCP Idle Session Timeout (msec):
If you set these fields too low, you may not be able to communicate with the device at all, even
through PAC Manager, to fix the settings. Then you would have to reset the controller to factory
defaults (see page 46).
4. Change these four fields as necessary:
Minimum RTO sets an absolute minimum value for the RTO. The device's calculated RTO will
never go below this value.
Initial RTO sets the RTO for the first communication try. Be careful: since all future tries are
based on this value, if you set it too low for network conditions, a connection will never be
made.
TCP Retransmits sets the number of times the device retries communication. Larger, busier
networks need a higher number of retransmits than smaller networks with less traffic.
TCP idle session timeout sets how long (in milliseconds) the device allows a session to
remain open without any activity. After this time, the device checks the session to make sure it
is still good, and closes it if it is not. The default is 240,000 milliseconds, or four minutes.
CHAPTER 4: MAINTENANCE AND TROUBLESHOOTING
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3000
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