Forum Discussion
Altera_Forum
Honored Contributor
13 years agoYou will need transceivers that can translate the RS232 or RS485 voltage levels to I/O standards compatible with your FPGA. You can find lots of transceivers compatible with 3.3V I/O for example.
Linear rs232 (http://www.linear.com/products/rs232%7crs562_transceivers), rs485 (http://www.linear.com/products/rs485%7c422_transceivers) Maxim rs232 (http://para.maximintegrated.com/en/search.mvp?fam=rs232&tree=master) , rs485 (http://para.maximintegrated.com/en/search.mvp?fam=rs485&tree=master)