Xin/Xout ideas?


Closed Thread
Results 1 to 2 of 2

Thread: Xin/Xout ideas?

  1. #1
    KarenSmit's Avatar
    KarenSmit Guest

    Default Xin/Xout ideas?

    I am playing around with the Xin/Xout commands using a PIC 16F88 and TW523 powerline interface.
    I thought that the TW523 was supposed to be "smart" and only transmit when no other devices are talking on the powerline.

    Is there some way (zero crossing pin??) to check if the power line is clear before transmitting a signal to avoid collisions?

    Any help with this question, comments regarding Xin/Xout, or sample code would be greatly appreciated.

    Thanks guys.

  2. #2
    Join Date
    Dec 2005
    Posts
    1,073


    Did you find this post helpful? Yes | No

    Default

    The TW523 is about as dumb as dumb can get. Not only does it not "only transmit when no other devices are talking on the powerline", it delays it's output so that you are actually seeing what was on the powerline 22 half-cycles earlier. Think of it as a 22-bit shift register with a 120Hz clock.

    There is no way to tell whether the powerline is clear before transmitting. The best you can do is to check that the output is the same as your input but this is after the fact.
    Last edited by dhouston; - 9th March 2006 at 11:47.

Similar Threads

  1. Any Ideas for a cheap touch sensor??????
    By rsocor01 in forum mel PIC BASIC Pro
    Replies: 17
    Last Post: - 19th October 2013, 00:33
  2. Multitasking Ideas
    By HYETİK in forum mel PIC BASIC Pro
    Replies: 6
    Last Post: - 15th April 2009, 07:50
  3. Ideas on ir-code for dimmer
    By tirithen in forum mel PIC BASIC Pro
    Replies: 0
    Last Post: - 13th February 2009, 23:22
  4. Timing inaccuracy - any ideas?
    By Optech in forum General
    Replies: 6
    Last Post: - 7th February 2008, 09:37
  5. A category for Project Ideas
    By Pic_User in forum Forum Requests
    Replies: 2
    Last Post: - 23rd June 2006, 07:29

Members who have read this thread : 0

You do not have permission to view the list of names.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts