On the utility disk you will find several files named 'pansi' 'pansi3' etc which I believe either have .kbd or .key extensions. There is also a 'tvi910' file. You need to copy them into your base pcplus directory.
Then go into setup and into your terminal settings for ANSI and set the keyboard file to 'pansi3.kbd', and in your TVI910 terminal set the keyboard file to 'tvi910.kbd'.
That should fix your keyboard translation problem.
When you connect to the switch, if you have a standard custom callout adapter (6.5 or lower) connect at 9600 8-N-1, if you have a CCA 2 (6.6) you can connect at 115,200. 9Regardless if you are using dial-up or connecting a cable directly to the CCA).
If you don't have access to the service login and password then everything will be menu driven. If you do, the command language (the commands are called AMO's) is EMML. The easiest way to learn EMML if you don't have access to a manual or list of AMOs is to go in to the menu and choose what you want to do, and then look in the top left corner of the screen for the AMO command. For example, SCSU. The 4 most common action words to combine with the AMO is DIS, ADD, CHG or DEL. Depending on how you are getting access to the system (logging in thru service login vs hitting SHIFT-F5 from a menu) changes the way you enter the AMO. If you hit SHIFT-F5 from a menu then it is referred to as a fast-path code. In this case you jumble everything together - DISSCSU for example, and then press F3 for "go" and fill in the blanks. In that case you can sometimes hit F5 to see what the options are for filling in the blanks - unless it is asking for something obvious like Extension #. In the case of the service login, under Direct AMO, you have to separate the action and AMO with a dash, such as DIS-SDSU. You will answer each question posed (if not optional) and then press Enter. If you have a question in that case you can enter a question mark for help.
Hopefully that gets you started. Beyond that is more than could be addressed in a little forum post!