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well I guess the best way is to choose whitch will be the main bus and the other can support. example: lets say you have 4 things you want to interface. we will call them A B C and D. A and B are on one circiuit card and C and D on another. And we will say rs232 supports rs485
I really advice you to go RS485. RS485 is easy to interface, it is just like RS232...... usees the things with the diference that the voltage in the Transmiting lines is diferencial. As a diferemce from RS232..... you can "daisy chain" a whole bunch (I believe upto 16) different devices, you must use a "protocol" to address each one, and have a master that control the whole thing.