Get VGA screen on macbook air

Hello,
I have an embeded device called "eBox 3350MX" which has a VGA port (RS-232 / Serial). Now, I found that PL2303 cables give Mac's connectivity USBtoSERIAL which is good. However, what I want to know is if there's a software that will allo me to get the output of the embedded device on the mac screen, on a sort of terminal window etc.
Otherwise I'll have to buy a JTAG cable and try to connect to the device console, which something I never done before. The problem is that I don't have access to any other stable computer, just the macbook air.
Best Regards
ps. I'm on Lion.

Hello William,
Thanks for the reply. I'm an ignorant when it comes to hardware and connectors/adapters.
Then as I see it, my options are:
a PL2303 USB-to-Serial cable and then a so-called J-tag cable which enables the 'console' on the device along with specific software which will permit me to read the output
Buy a low cost VGA screen and watch the output on the screen
The 2nd choice might be optimal if I find something small and sleek as I will be able to display some info like weather conditions, headlines etc.
Thanks for the help.

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