I figured out a way to do this as follows :
1. Create a basic TERATERM.INI
2. Build a Python script to generate multiple X.ini for each configuration as you needed. Such as, speed and mode selection.
3. Create your start up macro to send a file or receiving a file.
Everything is working as expected, however, it does not seem to perform as well as manually running the same process from the GUI.
For example, for sending a file from the GUI, the rate is pretty much accurate as expected, based on the meter status displayed. Where as, if do the same thing via command, it shows a very slow performance downward and sometime we got data correction too.
Any help is appreciated.