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Introduction
Network services associated with serial ports in general
Network service connections associated with serial ports in general include:
RealPort: A single TCP connection manages (potentially) multiple serial ports.
Modem emulation, also known as pseudo-modem (pool): A TCP connection to
the “pool” port is interpreted as an incoming call to an available pseudo-modem
in the “pool” of available port numbers.
rsh: Digi devices support a limited implementation of the Remote shell (rsh)
protocol, in that a single service listens to connections and allows a command
to be executed. Only one class of commands is allowed: a single integer that
specifies which serial port to connect to. Otherwise, the resulting connection is
somewhat similar to a reverse telnet or reverse socket connection.
Network services associated with the command-line interface
Network service connections associated with the command-line interface include:
Telnet: A user can Telnet directly to a Digi device’s command-line interface.
rlogin: A user can perform a remote login (rlogin) to a Digi device’s command-
line interface.