Users have found that when they have a
transient condition resulting in a failed dialup attempt with
dialup I/O, Citect SCADA will not use that modem again.
The problem occurs when you have modems in the modem pool that have
different requirements (Example: different data frame or rate). The
scenario in particular is that if all modems supporting one type of
requirement have had error conditions (line busy, no answer, etc)
then they will not be released for reuse until all modems
regardless of their configuration have failed. The system will look
constantly for a compatible modem and none will be found so will
just wait. This waiting will continue until all modems in the
entire pool have failed resetting all the modems for retry. In
general, most customers have all identically configured modems so
this issue never arises.
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