On Tue, Sep 7, 2010 at 2:18 PM, alan smith wrote: > Have a project that the client wants to replace a RS232 with RS485, prett= y simple other than these two issues: > > 1. direction control. =A0Since the RS485 is 3 wire differential, the tran= sceivers I have seen have direction control pins. =A0However what happens i= f you don't want this...ie...several of the converters Ive seen do not see = to require this for a point to point setup. =A0I'm looking at one from FTDI= and it uses a Exar SP481 and the two for direction control are floating. You could also look at RS-422. Similar to RS-485 but full duplex. Josh --=20 A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. =A0 =A0 =A0 =A0 -Douglas Adams --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .