In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Thanks Guenther,
My recollections seem to be based on using the USB to Serial Adapter or USB2SER for the BasicStamps and the Propeller which require the DTR line.  I didn't realize that the SX-Key doesn't have hardware handshaking.  It seems important that the user buys the Parallax adapter as it supports all of these products.

Since none of the items on my list are involved, I still wonder where the problem lies.

There has been a lot of discussion that laptop serial ports do not provide a high enough voltage swings for the RS-232 standard.  Could it be that most of these converters are no better?  After all they are relying on the USB line for +5volts.

In other words, does anyone know what are the true RS-232 thresholds for the SX-Key?  
If you are trying to use another RS-232 interface, that seems to be a useful piece of trouble shooting information for all.

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