Sena STS Series User Manual page 42

4.2.4.1. 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 STS 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 the STS Series is
completed, the state is changed to this state as a result that either of the remote host or the STS
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 STS Series accepts the request, the state is changed into [Established].
- [Sync-Sent]
Figure 4-5 Host mode configuration
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