SENA PS810 - Manual (Page 46)

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For this purpose, SENA OEM version of Serial/IP from Tactical Software, LLC is bundled with Pro
Series. Please refer to documentations of Serial/IP for more detail information about using the COM
port redirector. (Please refer to section Appendix 5. Using Pro Series With Serial/IP for more detail
information)
 Max. allowed connection
The Pro Series supports up to 8 multiple connections from external host(s) to the serial port. If there
are remote host connections by the remote host list configuration already, possible number of
connection will be reduced (Max. allowed connection - remote host(s) connected already). For
example, if user set Max. allowed connection as 8 and if there are 3 connections from Pro Series to
remote hosts, which are configured in the remote host list, then maximum number of connection from
external hosts to a serial port will be reduced to 5. For more detailed information for remote host list
configuration, please refer to 4.2.4. Remote Host Configuration section.
 Cyclic Connection
If Cyclic Connection function is enabled, the Pro Series will make an attempt to connect to the user-
defined remote host(s) at a given interval even if there’s no incoming serial data from the device
connected to that serial port. If there is data on the remote host(s) to be sent to serial device, it can be
transferred to the serial device via Pro Series’ 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 Pro Series 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 4-5 shows the State Transition Diagram of the session operations in TCP mode.
 Inactivity Timeout
When Inactivity Timeout function is enabled, connection between remote host(s) and Pro Series will
be closed automatically if there is no data transmission during the value which is set in Inactivity
Timeout configuration.
 Socket ID
When many Pro Series devices connect a same remote host(s), sometimes it is needed to identify the
device. In this case, Socket ID is available for identification of each device. Pro Series send the Socket
ID string before starting the data transmission. User can define Socket ID with a specific string. In TCP
mode, specified Socket ID strings are sent once at the time of establishing TCP connection.
 TCP Nagle algorithm
Modern TCP implementations include a mechanism, known as the Nagle algorithm, which prevents
the unnecessary transmission of a large number of small packets. This algorithm has proved useful in