
Chapter 5 – Network-to-Serial Connectivity Using Dialout
Command Line Interface and Application Examples for Multi-Tech Systems, Inc. IP Modules (S000368F) 68
Chapter 5 – Network-to-Serial
Connectivity Using Dialout
Network-to-Serial Connectivity Using the
Telnet / UDP Dialout Feature
This is an example of a Telnet or UDP client on an network connecting to a remote serial device. The IP module
acts as a Terminal Server using the Telnet or UDP dialout feature. This feature allows you to access the serial
port and establish two-way traffic between the Telnet/Raw-TCP/UDP client and the serial device.
Telnet Dialout Feature
The Telnet feature allows you to access the serial port and establish two-way traffic between the Telnet/RAW-
TCP client and the serial device.
The IP module, acting as a Terminal Server, accommodates the following features:
• Authenticates the serial port.
• Monitors and waits for activity on the standard Telnet port (23) or user-defined RAW-Socket.
• Opens the serial port from the command prompt (manual dialout) .
• Opens the serial port directly (auto dialout) using a TCP Client according to the configured port-number.
• Switches between the command prompt and a dial-out session when the session is in Telnet mode.
UDP Dialout Feature
The IPModule, acting as a Terminal Server, accommodates the following features:
• Monitors and waits for activity on the user configured UDP port.
• Opens the serial port directly (auto dialout) using a UDP Client according to the configured port-number.
• Termination of the UDP dialout session:
The established UDP dialout session can be terminated in one of the following ways.
UDP Inactivity Timeout:
If the UDP inactivity timeout is enabled and UDP session is inactive for the configured ‘t’ seconds, the
connection is terminated and waits for next connection.
Terminate String:
If the UDP terminate monitor is enabled, the UDP server scans the client side date for the terminate
string. If there is a match then the UDP session is terminated.
Dialout Monitor:
If the dialout-monitor is set to DTR, then a toggling in the DTR signal state terminates the UDP
session.
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