User manual

Common User Scenarios for Modem Emulation
Chapter 3 Modem Emulation Commands 261
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
D
IGI
O
NE
D
IGI
O
NE