Enhancement: Make RS485 Module Enable Pin Configurable

[aguglie]

The enable pin for the TTL<>RS485 module is hardwired to pin 5. This setup works seamlessly for modules that do not require an enable pin. However, for TTL<>RS485 modules that do need an enable pin, this hardcoded configuration limits flexibility and usability.
The hardcoded pin 5 as the enable pin for the TTL<>RS485 module could lead to conflicts, especially in complex projects where pin 5 is already in use or when the physical layout requires a different pin for enabling the RS485 module.

Expected Outcome
Users should be able to define their preferred pin for the TTL<>RS485 module's enable function in the library configuration.