Have a project that the client wants to replace a RS232 with RS485, pretty =
simple other than these two issues:

1. direction control.  Since the RS485 is 3 wire differential, the transcei=
vers I have seen have direction control pins.  However what happens if you =
don't want this...ie...several of the converters Ive seen do not see to req=
uire this for a point to point setup.  I'm looking at one from FTDI and it =
uses a Exar SP481 and the two for direction control are floating.

This application is similar

2. Addressing.  The application may morph into a multidrop so I am thinking=
 of putting a small PIC to be able to pass data that is addressed to the mo=
dule.  So I am looking for schemes, or references, on how the best way is t=
o be able to identify itself as its plugged into the system.  I will have c=
ontrol on the host side as well.


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