SENA Rhio10 - Manual (Page 28)

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Cyclic Connection
It Cyclic Connection function is enabled, the Rhio10 will make an attempt to connect to the user-
defined remote host at certain interval even if there’s no change in the I/O status data. If the
remote host prepares I/O control/monitor command, it will be transferred to the Rhio10 after the
connection is established. Eventually, users can monitor the I/O device periodically by making
the remote host send the serial command to the Rhio10 whenever it is connected to the remote
host. This option is useful when users need to gather the device information periodically even if
the status of the I/O device is not changed. Figure 3-7 shows the State Transition Diagram of
the session operations in TCP client mode.
Established
Closed
Data
I/O status changes
Inactivity time-out
TCP connection request rejected
Or
internal TCP timer is expired
TCP connection request accepted
Sync-Sent
I/O status changes
Incoming command
from remote host
Incoming TCP
disconnection request
Cyclic connection
interval time-out
Figure 3-7 State Transition Diagram of TCP client mode