If you switched from using the SecureTable module to Secure Payment's standalone payment mode, you need to switch back when the communication issue with the POS is resolved.
From the standalone payment main screen, touch the Settings button.
Enter the merchant password and touch Confirm.
Scroll to the Semi-integrated configuration section and touch Pay with SecureTable.
The terminal returns to the SecureTable main screen
If you have more than one terminal, repeat steps 1 to 3 for each additional terminal where you want to switch back from standalone payment mode.