The ports will be different per model / type of Droplet being used:

For a Droplet ONE (New residential model in distribution since end 2022)

For a Droplet PLUS (New utility model in distribution since June 2023 - ID should contain ..0001c03...)

For a Droplet PLUS v2.0.1 and above (available since June 2024)
The Industrial I/O port now caters for two RS485 ports as described below: