Page 5 of 5 FirstFirst ... 345
  1. #41
    Hi John the meter readings are all zero on that side switches open or closed

  2. #42
    Hi Kev

    I think a simple tester would prove if the breakout board is working

    Click image for larger version. 

Name:	bob limit switch tester.jpg 
Views:	126 
Size:	79.6 KB 
ID:	21301

    Click image for larger version. 

Name:	breakout board input tester.jpg 
Views:	171 
Size:	189.6 KB 
ID:	21303
    John
    Last edited by john swift; 27-03-2017 at 05:47 PM.

  3. #43
    John can I send you the board ?
    You know way much more than I do about this kind of stuff

  4. #44
    Hi Kev
    OK
    PM sent

  5. #45
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 7 Hours Ago Has been a member for 9-10 years. Has a total post count of 2,121. Received thanks 233 times, giving thanks to others 5 times.
    John, I suspect you've got the optos in the wrong order.

    If you look at the traces on the top side, I'd say the top opto is P10, and it's track runs down the outside of the limit switch connector to the E-Stop connector. The tracks of the other 4 optos seem to match up nicely with the Limit Switch connector, and I wouldn't expect the bottom opto track to run the way it does if it was going to the E-stop connector.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  6. #46
    Hi m_c


    from post 45 "John, I suspect you've got the optos in the wrong order"
    you are correct

    now I have looked more closely
    Click image for larger version. 

Name:	Limit Switch tester & partial TX14175 circuit.jpg 
Views:	329 
Size:	355.5 KB 
ID:	21359

    during the last few days I have installed mach3 on 3 PC's
    IBM thinkcentre , Dell optiplex 755 and a PC built using a ASUS H110M-R motherboard

    so I should be in a better position to test Kevins mach 3 settings


    John


    PS
    as I can't upload a PDF data sheet on DC to DC converters
    a link can be found here-
    http://uk.rs-online.com/web/p/isolat...rters/1914922/
    Last edited by john swift; 06-04-2017 at 11:56 AM. Reason: add PS link to RS Components for DC DC converters

  7. #47
    Hi...as per my knowledge when the limit switch is closed, the EL817 opto isolator's NPN transistor will ground the printer ports input pin. The breakout board does not have any pull up resistors to ensure a printer port input is at a valid logic high when the limit switch is open.

    assembly circuit
    Last edited by RickyTerzis; 03-08-2017 at 10:27 PM.

Page 5 of 5 FirstFirst ... 345

Similar Threads

  1. Limit switch problem
    By ECCO in forum General Electronics
    Replies: 7
    Last Post: 25-12-2015, 10:28 AM
  2. Another Home - Limit switch question
    By Cube3 in forum General Electronics
    Replies: 6
    Last Post: 26-12-2013, 06:51 PM
  3. Limit and Home Switch Choice
    By Wobblycogs in forum General Electronics
    Replies: 25
    Last Post: 02-12-2013, 05:16 PM
  4. FOR SALE: Z axis with Home/limit switch and Nema 23 3nm
    By Shinobiwan in forum Items For Sale
    Replies: 6
    Last Post: 02-02-2013, 09:54 AM
  5. bounce off home switch.
    By motoxy in forum Machine Control Software
    Replies: 18
    Last Post: 30-08-2012, 11:26 AM

Bookmarks

Posting Permissions

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