You can set up multiple terminals in the same way you set up your first terminal.
Click Settings > Integrations.
In the Payments / Rebates section, click Add Terminal under Tyro.
Select the Level setting.
Enter the Merchant ID and Terminal ID, which is found on the Configuration Setting on the Tyro terminal.
Click Pair in Halaxy.
Press Start on the Tyro terminal (Authorise POS).
Once connected, click Save in Halaxy.