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The -t option to ttymon(1M) specifies how long a port will wait for a service to be started after an initial connect indication. timeout is specified in seconds.
Internal to ttymon, the internal_timeout_1 timeout is used in bidirectional mode. The 60-second timeout monitors when a dial-out connection has been dropped for the purpose of raising DTR and restarting port monitoring.
Another internal timeout is internal_timeout_2. This is a 4-second timeout which comes into play when a line is dropped. It prevents a new connection from being established during this interval. This timeout exists so that ttymon will not confuse a modem disconnect message with a new connect indication.