Multi-bus system means you have turned on MultiCommSupport=1, and
set CommPortList accordingly. (Assumed COM1 bus1, COM2 bus2, …)

[Comm Setting] MultiCommSupport=1
CommPortList=1234

For 9600 baud, you need to change in EdotWin.Ini:

[Comm Setting] BaudRateList=9600960096009600

First 4 digits means baud rate for bus1, next 4 is bus 2, …