User`s guide

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Digi devices use the patented RealPort COM/TTY port redirection for Microsoft Windows.
RealPort software provides a virtual connection to serial devices, no matter where they
reside on the network. The software is installed directly on the host PC and allows
applications to talk to devices across a network as though the devices were directly
attached to the host. Actually, the devices are connected to a Digi device somewhere on the
network. RealPort is unique among COM port re-directors because it is the only
implementation that allows multiple connections to multiple ports over a single TCP/IP
connection. Other implementations require a separate TCP/IP connection for each serial
port. Unique features also include full hardware and software flow control, as well as tunable
latency and throughput. Access to RealPort services can be enabled or disabled.
Encrypted RealPort
Digi devices also support RealPort software with encryption. Encrypted RealPort offers a
secure Ethernet connection between the COM or TTY port and a device server or terminal
server.
Encryption prevents internal and external snooping of data across the network by
encapsulating the TCP/IP packets in a Secure Sockets Layer (SSL) connection and
encrypting the data using Advanced Encryption Standard (AES), one of the latest, most
efficient security algorithms. Access to Encrypted RealPort services can be enabled or
disabled. Digi’s RealPort with encryption driver has earned Microsoft’s Windows Hardware
Quality Lab (WHQL) certification. Drivers are available for a wide range of operating
systems, including Microsoft Windows Server 2003, Windows XP, Windows 2000, Windows
NT, Windows 98, Windows ME; SCO Open Server; Linux; AIX; Sun Solaris SPARC; Intel;
and HP-UX. It is ideal for financial, retail/point-of-sale, government or any application
requiring enhanced security to protect sensitive information.
Enable RealPort
Selecting this option enables RealPort on the router.
Listen on port
This configures the TCP port on which the router will listen for RealPort connections.
Maximum number of sockets
This defines the maximum number of RealPort connections that the router will support.
Enable encrypted RealPort
Selecting this option enables encrypted RealPort on the router.
Encryption mode to listen on port
This configures the TCP port on which the router will listen for encrypted RealPort
connections.
Maximum number of encryption sockets
This defines the maximum number of encrypted RealPort connections that the router will
support.
Enable Device Initiated RealPort
Selecting this option enables router to make a RealPort connection to a host PC.
Connect to host a.b.c.d Port n
This configures the IP address or hostname and TCP port that the router should use when
making a device initiated connection.
Allow s seconds between connection attempts
This configures the interval in seconds between device initiated connection attempts.
Send TCP Keep-Alives every s seconds