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Old June 12th, 2009   #8
Join Date: Feb 2006
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Originally Posted by Nigel Worsley View Post
The easiest way is not to bother!

Tie the RS485 driver chip's Driver Enable signal to the Not Receive Enable and the UART will never see the transmit data in the first place.
There is a really important point here that Nigel is making. If you do have your driver chip wired such that you can see the transmit data on the receive then make sure your code ignores the receive while transmitting otherwise it is very easy to receive your own transmitted messages and parse them. (I've made that slip a couple times myself).
Scott M. Blair
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