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Chapter 7 Special Features: Modem Emulation 43
Modem Emulation
The following Digi TS Family products include Modem emulation:
• Digi One TS
• Digi One TS Wireless
• PortServer TS 2/4 MEI
• PortServer TS 2/4 Wireless
• PortServer TS 1/3 + Modem
Note: Port one on the PortServer TS 1/3 + Modem is an actual embedded modem.
The remaining ports are capable of emulating a modem.
• PortServer 8/16
Modem emulation enables a system administrator to configure a
networked Digi device to act as a modem. The Digi device emulates
modem responses to a serial device and seamlessly sends and receives
data over an Ethernet network instead of a PSTN (Public Switched
Telephone Network). The advantage for a user is the ability to retain legacy
software applications without modification and use a less expensive
Ethernet network in place of public telephone lines.
To use a Digi device for modem emulation, do the following:
• Use a cable with the correct wiring pinouts (see "Modem Emulation
Cable Signals" on page 44)
• Configure the serial ports and device type with the Web Interface
serial port profile - Modem Emulation
Note: Before AT commands are accepted, DSR must go high on the Digi device-
Common User Scenarios
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 One TS replaces a modem connected to a
workstation running an application. The Digi One TS allows for the use of
software applications without modification by responding to all the AT
commands configured in the workstation application. The Digi One TS
Chapter 7
Special Features: Modem Emulation