Ed -
You could use the FTDI 5V TTL/UART to USB cable (FT232RQ chip). Sparkfun sells a version of this cable ($17.95) that has RTS and CTS brought out. When Sparkfun has "sales" this cable is often discounted further ($11.95). https://www.sparkfun.com/products/9718
I use this cable for interfacing computers with the Kenwood 6-pin DIN UART (inverted serial TTL) for remote computer control (CAT) of frequency, etc. This specific FTDI chipset (FT232L and FT232Q) and its Utility software (FT_PROG) permits INVERTING the serial lines (required for Kenwood usage). http://www.ftdichip.com/Support/Utilities.htm#FT_Prog ===== The "other approach" was posted here on amsat-bb back in 2010/2011. That is a hardware emulation solution by Dave Dowler, KA6BFB (2010) and Chuck Jones, N6BIL for using the Yaesu FT-736R with Ham Radio Deluxe (HRD).
DIY Project write-up. http://tinkyr.altervista.org/radio/projects/736/N6BIL%20Hardware%20Emulator....
An OSH-Park PCB board was developed for this solution (above). https://oshpark.com/shared_projects/Ae6IJiqx
greg w9gb
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