But one of the previous posts says that two RS485 transceivers between two RS232 transceievers is a 485 communication, and the software is exactly as it would be for 232. So, I assume my software will work as perfectly for 485, and this is how (roughly) i used my software.

If that is what you want (extending distance by leaving RS-232) what you want is RS-422 which works exactly like 232 but uses a differential bus. The drivers are the same as for RS-482 and thus you will hear gobblygook such as 'full duplex RS-485' which does not exist.

Have a lokok at RS-422 in "best serial appnotes" (address in links <--)

Erik