How can launch Rumba AS400 Display from command line which will show me the login screen so I can input my username and password?

We are working on a automated process which need launch Rumba AS400 from command line. We noticed there is an example like below:

RumbaPage.exe /Display:MFrame /Host:<destinationHost> /Port:<Destination Port>

but this command and arguments cannot bring the AS400 /TN5250 login screen let me input username and password

What should be the correct command arguments so I don't need select AS400 display from Rumba GUI? Then it can recognize the destination host and port from command line to launch Rumba until the login screen show up automatically?

Thanks!