In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Jon Williams wrote:

In open baud modes the serial line is only driven in one direction (state of a "1" bit) -- the idle state is allowed to float and is handled by a pull-up (open true) or pull-down (open inverted).  I typically use open true and a 4.7K pull-up on the serial line.
 

This is an old article but will give you an idea: [url=http://www.parallax.com/dl/docs/cols/nv/vol5/col/nv116.pdf]http://www.parallax.com/dl/docs/cols/nv/vol5/col/nv116.pdf[/url]

 

The article will show you how to user serial commands with an external device; just ignore the old SX/B syntax -- we've come quite a long way with SX/B since I wrote this column.

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