Problem in RS485 interface

Discussion in 'General Electronics Chat' started by sanddune, Feb 10, 2009.

  1. sanddune

    Thread Starter Member

    Dec 2, 2008
    10
    0
    Hi All,

    Prj Description:
    I am designing a hub which receives i/p's(max of 4 inputs) from actuators and slaves connected to the hub(output). When an actuator input is received Master(Hub) will process it and sends a common command to all the salves connected to its output....based on the command each slave will do the necessary.

    Now the problem is the slave receives data which is contains noise and hence displays junk day to the LCD........


    Can anyone please verify my schematics.....which is attached.
    Also attached is my slave input(
    yellow w/form) and master output(blue w/form)......

    Thanks in advance...........
     
  2. sanddune

    Thread Starter Member

    Dec 2, 2008
    10
    0
    I am sending "Hello world" at baud rate: 384000
     
  3. sanddune

    Thread Starter Member

    Dec 2, 2008
    10
    0
    can some one explain what could be the reason for the noisy signal at the slave output to the Micro controller?.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    I would question the 100 ohm resistors between the Max485 ground pins and circuit ground. Try removing them (put the ground pins directly to ground) and see if things don't start working.
     
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