If you are using Rs232C, then you want to use the lowest capacitance cable you can fine. Avoid twisted and shielded cable if possible. Hopefully you are opperating in an electirically 'quiet' environment. I have personally run 9600 baud over a few hundred feet using 8 wire 22 guage unshielded...
There are very inexpensive (<$20US) USB <-> Serial port converters. Plug it into your computer's USB port, install the software drivers that comes with the product, and bingo; you have a serial port on your computer.
regards, -john-
The application is radiant floor heating. The envrionment is southern Oregon. Must operate efficiently with ambiant outside temperatures in the 30 - 60 F range with 40K BTU at 30 degrees. There are numerous swiming pool heater vendors supplying heat pumps, but most all shut down at the first...
