A Tunnel in Accept Mode can be started in a number of ways:

Disabled: never started

Enabled: always started

Any Character: started when any character is read on the Serial Line

Start Character: started when the Start Character is read on the Serial Line

Modem Control Asserted: started when the Modem Control pin is asserted on the Serial Line

The Local Port can be overridden and by default is 10001 for Tunnel 1 and 10002 for Tunnel 2.

The Protocol used on the connection can be one of TCP, SSH, Telnet, or TCP w/AES. If security is a concern it is highly recommended that SSH be used. When using SSH both the SSH Server Host Keys and SSH Server Authorized Users must be configured.

The Flush Serial Data boolean specifies to flush the Serial Line when a connection is made.

For debugging purposes, the Block Serial Data and Block Network Data booleans can be toggled to discard all incoming data on the respective interface.

The TCP Keep Alive timer specifies how often to probe the remote host in order to keep the TCP connection up during idle transfer periods. By default the probes are disabled.