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by **username** » Sun Mar 04, 2007 11:06 pm

Hi,

I am trying to connect the Pluto board to 3.3v rs232 interface (just transistor voltage shifter) and 3.3v FTDI (FTDI232RL), but I didn't have any luck to configure the FPGA. What does the Pluto board require for the RS232 connector.

Thanks
Eric

by **fpga4fun** » Sun Mar 04, 2007 11:34 pm

Pluto takes the RS232 signal directly for its reception! So you feed the TxD signal from your PC directly to Pluto's RxD.

For transmission, you need to go through a MAX232 or TXDI or something similar...

by **fpga4fun** » Fri May 14, 2010 2:40 am

Basically, Pluto RS232 is asymmetric i.e. you need an inversion in the Pluto-->PC direction while you don't need one in the PC--> direction. If you are using a FTDI232RL, enable the TxD invert bit.