This error just means the S300 needs to be reconnected to the POS.
Here are the steps to reconnect the PAX S300 pin pad.
First, you are going to grab the IP address from the PAX S300 and notate it.
F + 1 will pull up menu
(Write down, note IP address)
Then on the BLOGIC POS:
Swipe over to second page (left)
Settings (Not in the POS Dashboard)
Enter IP address here