"I have few questions about SAS protocol."

SAS? If not which protocol are you talking about?

"Unfortunately I have no idea about Python and I can't run Python script in Komodo IDE because it tells me it can't find PIP."

You don't need to run it to be able to see what it is doing, looking at the code alone should allow you to walk through it, if you have problems breaking down each line one at a time shouldn't be too difficult.

"I read in the SAS documentation that you need to adjust the parity before sending the code to the slot machine, but the Win32::SerialPort documentation is not too generous with explanations, so I'm asking for a little help."

Initialization:

"parity

One of the following: "none", "odd", "even", "mark", "space". If you select anything except "none", you will need to set parity_enable."

Update: fixed typo, thanks LanX.