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October 23, 2011
about 8 years ago
Read for quick and easy fixes! My adapter did not work correctly out of the box. The TX and RX LEDs are reversed as I would expect to see TX LED pulse when sending data to the 485 bus. The CTS# line is unconnected and therefore internally pulled high. The CTS line being high prevents the UART from sending data as the CTS line is the counterpart for RTS/CTS flow control. You could solder pin 11 to ground or better yet, I recommend users perform the following EEPROM change to the FT232RL using the FTDI FT_Prog utility (http://www.ftdichip.com/Support/Utilities.htm).
Select Hardware Flow Control (RTS/CTS) in your favorite program or library and away you go!
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