Hi to all engineers,

I have a few questions.

1.      I always use uart over rs485 interface and now I am wondering
what kind of protocol
Is it used in real rs485 is it similar to standard uart
start/data/parity/stop ?
2.      30 feet long RJ45 cable if it is not wired right I get data
speed drop
correct connector installed I get 1.500 kb per second
incorrect connector installed I get 400 kb per second
my question is if the data is not traveling thru twisted pair
why speed drops? Is this means we are not loosing data just
we are not receiving it fast enough right?
     3.main reason I need to know this because I am making
        a tester that is going to check if connector is correct or not
        and I need to know if I need to count amount of bytes recived
        or amount of time another words I want to send data from one
      side of connector and receive it back from the other side of
connector
      I just do not know how many byte of data to send to make sure it
Is fine any idea? Will appreciate


Andre

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