User guide

Common User Scenarios for Modem Emulation

Chapter 3 Modem Emulation Commands 265

In Diagram B, two Digi devices will replace modems on both sides of the

connection. The initiation of the connection occurs with either of the Digi

devices. If both ends are Digi devices, the TCP listening port number is

50001 for port 1. An example of the connection command is:

ATDT 192.168.25.30:50001

Upon establishing a successful 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. After the CONNECT is received, the

transmission of data begins. Using the modem escape sequence or

dropping DTR on either side terminates the connection.

Workstation

Serial cable

Digi device

User Scenario - Diagram B

Workstation

Serial cable

Ethernet

Digi device

IGI