# Select RTU

When you launch Alarmware™, the Select RTU dialog box will appear:

Highlight the RTU you want to connect with on line and/or configure off line, by clicking once on an existing RTU name.

At this point, the Select RTU dialog box will allow you to perform a variety of operations, such as:

- Connecting to an RTU via the phone line by clicking the Connect Phone button.
- Connecting to an RTU via a serial port by clicking the Connect Com Port button.
- Configuring an RTU offline before connecting to the unit directly by clicking on the Work Off-line button.
- Using the Add or Edit button to add an RTU to the list, or edit basic RTU information.
- Using the Delete button to remove an RTU from the list, as well as its existing configuration data and log files.

There is a convenient "Recently Used" list at the bottom of the dialog box for RTUs most recently selected.

To select another RTU, close the online or offline session with the currently selected RTU, then click on Select RTU on the top menu.

NOTE: If you need to add RTUs, be sure that the model number is correctly selected from the dialog box that requests it. If the model number is incorrectly selected, you will not be able to make connection with the RTU.