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Using the MSS Modem Emulation Mode

5-10

Adding Hosts

The host list can include up to 12 host entries in any combination of TCP (raw, Telnet, and Rlogin) and UDP

addresses.

Figure 5-14: Adding Entries to the Host Table

In the example, the UDP host entry is actually a broadcast IP address. Data is sent to all hosts on that

particular subnet.

Removing Hosts

To remove an entry from the host table, use the Show Hostlist command to find out its entry number, then

use the

Hostlist Delete command to delete it.

Figure 5-15: Removing Entries from the Host Table

Modem Emulation Mode

In modem emulation mode, the MSS presents a modem interface to the attached serial device: it accepts

AT-style modem commands and handles the modem signals correctly. The MSS forms a network

connection based on the ATDT commands issued from the serial device.

Normally there is a modem connected to a PC and a modem connected to some other remote machine. A

user must dial from his PC to the remote machine and accumulate phone charges for each connection. With

the MSS in modem mode, you can replace your modems with MSS units and use an Ethernet connection

instead of a phone call, all without having to change communications applications. You can then connect to

any remote machine that has an MSS without making potentially-expensive phone calls.

Note: If the MSS is in modem emulation mode and the serial port is idle, the MSS can still

accept network TCP connections to the serial port.

To use modem mode, enable modem emulation and set your MSS for Autostart using A as the autostart

character. This triggers the MSS to enter modem mode whenever it sees a modem-style AT command.

Figure 5-16: Enabling Modem Emulation Mode

As soon as someone types an AT command, the MSS will enter modem mode and begin processing the AT

commands. While in modem mode, the MSS will not display a command line prompt.

Local>> CHANGE PORT n DEDICATED HOSTLIST

Local>> HOSTLIST ADD TCP 192.0.1.35:5000T

Local>> HOSTLIST ADD UDP 192.0.2.255:5500

Local>> SHOW HOSTLIST

1 192.73.0.233:5000

2 192.0.1.176:5500

3 192.0.4.255:6000

Local>> HOSTLIST DELETE 2

Local>> CHANGE PORT 2 MODEM EMULATION ENABLED

Local>> CHANGE PORT 2 AUTOSTART CHARACTER “A”

Local>> LOGOUT PORT 1

Lantronix MSS4 Installation Guide

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