EDS User Guide
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Tunneling allows serial devices to communicate over a network, without “being
aware” of the devices which establish the network connection between them.
Tunneling parameters are configured as described in Tunnel Settings, on
page
57
—or via the Command Mode Tunnel Menu (see the EDS Command
Reference for the full list of commands.)
The EDS supports two tunneling connections simultaneously per serial port. One of
these connections is Connect Mode; the other connection is Accept Mode. The
connections on one serial port are separate from those on another serial port.
Connect Mode: The EDS actively makes a connection. The receiving node on
the network must listen for the Connect Mode’s connection. Connect Mode is
disabled by default.
Accept Mode: The EDS listens for a connection. A node on the network initiates
the connection. Accept Mode is enabled by default.
Disconnect Mode: This mode defines how an open connection stops the
forwarding of data. The specific parameters to stop the connection are
configurable. Once the EDS Disconnect Mode observes the defined event occur,
it will disconnect both Accept Mode and Connect Mode connections on that port.
When any character comes in through the serial port, it gets copied to both the
Connect Mode connection and the Accept Mode connection (if both are active).
Connect Mode
For Connect Mode to function, it must be enabled, have a remote station (node)
configured, and a remote port configured (TCP or UDP). When enabled, Connect
Mode is always on.
Enter the remote station as an IP address or DNS name. The EDS will not make a
connection unless it can resolve the address. For DNS names, after 4 hours of an
active connection, the EDS will re-evaluate the address. If it is a different address, it
will close the connection.
Connect Mode supports the following protocols:
AES over TCP and UDP
SSH (the EDS is the SSH client)
SSL
TCP
