Hi Eliezer
I am not sure if I got properly your problem.
You are using the PT60 on your project and you want to add a Ethernet communication to your design.
For this you will add an IC that make the communication between the Ethernet to the S08PT, like a bridge?
I know that there are ICs that are USB-ethernet bridge but the S08PT does not have USB module.
Maybe there are a UART -Ethernet bridge, if this is the case you only need to set the uart at the proper baud rate
Regards
Vicente