Can someone please explain a simple way to communicate with my L2 managed switch from my iMac

Aloha everyone

I have a TP-Link SG3109 9 port L2 Managed Gigabit Switch.

I am trying to communicate with it through my IMac for the past 2 days, but I have miserably failed.

The switch has a SERIAL PORT, and also a Web enabled interface.

I am unable to log on to it, as the IP address in the PDF manual is: 192.168.0.1 or 192.168.1.1 and typing in the FIRST only brings up my SKY ROUTER'S web page, and the second fails.

The manual says I need to setup the switch FIRST via the serial connector, so I bought off Amazon a SERIAL TO USB connection, which came with some PROLIFIC drivers.

Some research on the net pointed me to some more recent drivers for PROLIFIC PL2303 chip in MAVERICKS, which I've downloaded, but I don't think the serial connection is recognised by my mac or the OS?

I also downloaded some terminal programs like COOLTERM and SECURECRT, BUT I HAVE NO CLUE HOW TO USE THEM OR EVEN COMMUNICATE with the switch....

I also saw some threads explaining how to use terminal, but again it's all code and very difficult to understand.

Can someone please explain a SIMPLE way to do this...

Or in plain English??

Many thanks