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Chapter 6 – Serial-to-Network Connectivity Using Serial Dial-in

Command Line Interface and Application Examples for Multi-Tech Systems, Inc. IP Modules (S000368F) 79

Scenario 2 – Auto Dial-in in Telnet Mode

This example shows how to setup a serial auto dial-in session in Telnet mode. The auto dial-in session is opened

by Telnet client embedded in the IP module to the configured server on a configured port. Once the session is

opened successfully, there can be two-way traffic between the serial device and the remote server.

• You can switch from Command Prompt to Dial-in session using the restore session command.

• You can switch from Dial-in session to Command Prompt using <escape-monitor-string>.

Prerequisites

RAW mode (Global and each port) must be disabled using the following command:

Enable/Disable the RAW mode globally for all Auto-Dial-in sessions: # set ip telnet raw-mode <enable/disable>

Auto Dial-in Feature in Telnet Mode

Wireless IP Auto Dial-In Setup in Telnet Mode Commands

# set serial auto-telnet enable

# set serial s0 auto-dialin enable

# set serial s0 auto-dialin trig-mode dtr-char

# set serial s0 auto-dialin-ipaddress 202.54.39.96

# set serial s0 auto-dialin-port 5000

# set serial s0 auto-dialin-protocol telnet

# set serial s0 stop-bits 1

# set serial s0 baud-rate 115200

# set serial s0 data-bits 8

# set serial s0 parity none

# set serial s0 flow-control rts-cts

# set serial s1 stop-bits 1

# set serial s1 baud-rate 115200

# set serial s1 data-bits 8

# set serial s1 parity none

# set serial s1 flow-control rts-cts

# set serial s1 connect-type modem

# set serial s1 modem dial-number 123

# set serial s1 modem dialing-trig-mode none (See Chapter 4 - Scenario Setup Prerequisites)

# set ppp ppp0 ipcp-mode client-only

# set ppp ppp0 username "IP module"

# set ppp ppp0 password "IP module"

# save

Notes

• Once the PPP link is up with an IP address, the auto dial-in session can be probed. When detecting either a

DTR signal or when any character is received from the serial device connected to the RS-232 serial port of IP

module, the Telnet client on board in the IP module establishes a Telnet session to 202.54.39.96 on port 5000.

• The serial tunnel between the serial device and the Telnet Server terminates in one of the following conditions.

– The connection is broken between the serial device and the serial port of the IP module.

– The Telnet Client on board is terminated.

– The Telnet Server terminates the session.

• You cannot open more than one Dial-in session.

• The Dial-in session is closed when the configuration session is closed (if opened).

• When escape-monitor is enabled, care should be taken during file transfer that the escape-monitor-string

is not part of the data.

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