SENA LS100W - Manual (Page 37)

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Cyclic Connection
It Cyclic Connection function is enabled, the LS100W will make an attempt to connect to the user-
defined remote host at certain interval even if there’s no incoming serial data from the device. If
the remote host prepares certain data, it will be transferred to the serial device via its serial port
after the connection is established. Eventually, users can monitor the serial device periodically by
making the remote host send the serial command to the LS100W whenever it is connected to the
remote host. This option is useful when users need to gather the device information periodically
even if the serial device does not send its data periodically. Figure 4-3 shows the State Transition
Diagram of the session operations in TCP client mode.
Established
Closed
Data
Incoming data via
serial port
Inactivity time-out
TCP connection request rejected
Or
internal TCP timer is expired
TCP connection request accepted
Sync-Sent
Incoming data via
serial port
Incoming data
from remote host
Incoming TCP
disconnection request
Cyclic connection
interval time-out
Figure 5-3. State Transition Diagram of TCP client mode