Basic questions for RS232/422/485 & Modbus

Hello,
i have to write some libraries for four types above.
But, i only have a normal windows-computer with a normal serial-connection.
Do i see it correct that can then only make "RS232" with this and that 422 amd 485 are then "special" serial-cards?
So for me it seems that 232/422/485 are three different hardware-types.
And only Modbus is a software-protocol that can be created with labview.
Is this correct?
Thanks for help
Solved!
Go to Solution.

RS232/422/485 are hardware specific. Many RS422 UART cards out there will also handle RS485. Luckily, most of these cards just show up as a COM port, so the software is the same for all 3.
According to Wikipedia, most Modbus devices use RS485 as the hardware layer. I will admit that I have no exprience with Modbus, so I'm not going to offer any advice on it.
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