usb to rs 232 and 485 converter and vise versa

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First check development kit documents of the CP21XX.
for minimal implementation of RS-232 which uses only Rx and Tx you will need only a Phy. like MAX232.
also for RS-485, a line driver/receiver IC like MAX485 is all you need.
maxim and analog devices have several interface (RS232 and RS485) products.

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i hav e all this ic and i am geting usb to rs 232 and from usb to rs 485 but iam not getting in reverse order
 

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