Jump to content


Photo

Q1 should nog be there


  • Please log in to reply
2 replies to this topic

#1 jim

jim

    Advanced Member

  • Administrators
  • 3,385 posts

Posted 20 February 2014 - 05:40 PM

If used as a master, this board is terrible: pin 2 and 3 of the 485 should then be high, but in stead Q1 is causing DE/ to turn low when you want to send. This results in the inverse line NOT producing any output, except for short peaks at falling edges on the DI.

Simply put: I can't drive my DMX dimmer. After fysical removal of Q1 the board works fine.

IF you really want to use this setup (why?? just put the DE RE/ on a pin!!), the gate of Q1 should be wired to RX, not TX !!



#2 jim

jim

    Advanced Member

  • Administrators
  • 3,385 posts

Posted 20 February 2014 - 05:40 PM

Thanks for the feedback. Which product are referring to? Can you please update with a URL to it?



#3 jim

jim

    Advanced Member

  • Administrators
  • 3,385 posts

Posted 20 February 2014 - 05:40 PM

RS485 shield for Arduino






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users