Users Connecting to Serial Devices
36 IOLAN Device Server User’s Guide, Version 1.0
Users Connecting to Serial Devices
For a user to connect to the serial device connected to the Device Server from the LAN, the Line
Service must be set to Rev Telnet. The user will either access the serial device directly or go through
the Easy Port Access Menu, depending on the User Level setting.
Users who are Level Admin or Normal will access the serial device directly; the user must connect to
the Device Server’s IP address and port number (the DS Port parameter). The user will be asked to
login with a user name and password; if this is successful, the user is automatically connected to the
serial device.
Users who are Level Restricted or Menu can access the serial device through the Easy Port Access
Menu, which displays the line number and name and a logout option; the user just needs to connect to
the Device Server’s IP address. The user will be asked to login with a user name and password; if this
is successful, the Easy Port Access Menu is displayed. Note: if the Line Service is Rev Telnet and
the user uses SSH to connect to the Device Server, nothing but Logout will be displayed on the Easy
Port Access Menu; the connection protocol and the Line protocol must match.
Users Connecting to the LAN
For a user to connect to the LAN through the Device Server from a serial device, the Line Service
can be set to any Direct or Silent setting, plus Bidir or DSLogin.
User accounts should be created when:
zauthentication is being done locally by the Device Server.
zyou want to create predefined sessions for a user to limit that user’s access to the network.

Connecting To the Device Server

When a user connects to the Device Server, that user is authenticated and is usually set up with
predefined sessions or given the opportunity to configure a Free Session to access any host using
any protocol (must have a Level of at least Normal to configure a Free Session). In this example, the
user must have a Line and User Service of DSLogin and DSPrompt, respectively. So, user Dennis is
authenticated by the Device Server and then chooses to configure a Free Session to the HR_Server
using the Telnet protocol (Dennis could have attempted to access any host on the network).
Network
Device Server
HR_Server
perle
Dennis
User: Dennis
Free Session: Telnet
Dumb Terminal