Installation guide

Common User Scenarios for Modem Emulation
152 Chapter 3 Modem Emulation Commands
Common User Scenarios for Modem Emulation
The Digi device in modem emulation mode allows for the easy replacement
of modems in almost any environment where there is a LAN or WAN.
In Diagram A, the Digi Connect device replaces a modem connected to a
workstation running an application. The Digi Connect device allows for the
use of software applications without modification by responding to all the
AT commands configured in the workstation application. The Digi Connect
device connects to the IP Address of the server when an
ATDT ipaddress:port (ATDT 192.168.25.5:50001)
command is issued. Once the remote device establishes the TCP
connection, a CONNECT message is sent to the serial port and only then
does the Digi device switch from AT command mode to data mode. Using
the modem escape sequence or dropping DTR on either side terminates
the connection. A DISCONNECT message will be sent to the application if
the remote side closes the TCP connection.
Server
192.168.25.5
Workstation
Serial cable
Ethernet
Digi device
User Scenario - Diagram A
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