SENA PS210W - Manual (Page 44)

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Figure 4-4 Host mode configuration (TCP mode)
4.2.3.1. TCP mode
For easier understanding of TCP modes, a simplified State Transition Diagram is often used. And to
help users understand the diagram, the TCP state of the Pro Series is briefly described as follows.
[Listen]
It represents “a waiting for a connection request from any registered remote host”. It is a default
start-up mode when it is set as TCP mode.
[Closed]
It means “no connection state”. If the data transfer between a remote host and t he Pro Series is
completed, the state is changed to this state as a result that either of the remote host or the Pro
Series sent a disconnection request. After this, the state is automatically changed to [Listen] mode.
[Sync-Received]
The state is changed from [Listen] to [Sync-Received] if one of the remote hosts has sent a
connection request. If the Pro Series accepts the request, the state is changed into [Established].
[Sync-Sent]
If the Pro Series has sent a connection request to a remote host, the state is changed from
[Closed] to [Sync-Sent]. This state is maintained until the remote host accepts the connection
request.