# To configure a base dial‑in data link

1. Tap and select Settings / Survey styles. Select the required survey style. Tap Edit.
2. Select Base data link.
3. Set the Type field to Dial‑in.

4. In the GNSS contact field:

   - If you have already configured the GNSS contact to use for the dial-in data link, enter the GNSS contact name for the contact, or tap to select the GNSS contact from the GNSS Contacts list. The list is filtered according to the contact type.

   - To create a new GNSS contact, tap to open the GNSS Contacts screen and then tap New.

5. To display the GNSS contact that is configured in the survey style, or to be able to change the GNSS contact when you start the survey, select the Prompt for GNSS contact check box.

6. In the Receiver port field, select the port on the receiver that the controller will connect to.
7. If required edit the Baud rate and Parity settings.
8. If you are using the modem inside another device such as a mobile phone, select the Hardware flow control check box to enable the controller to know when to receive data from the device and when to send data to the device.
9. Tap Accept.