Bringing TBI and Multi Port Fuel Injection to a New Level.     EFI Conversions and Tuning! Seattle to Portland! E-mail Tuning Consultant!
Results 1 to 9 of 9

Thread: Aldl interface, 2 transistor type

  1. #1
    Carb and Points!
    Join Date
    May 2014
    Posts
    6

    Aldl interface, 2 transistor type

    I have 2 transistor aldl interface that works with older 160 baud ecm 747, the question is will it with Tunerpro rev 5, and a ecm with 8192 baud if connect to Pin M. i am thinking upgrading to faster ecm

  2. #2
    Fuel Injected!
    Join Date
    May 2014
    Posts
    44
    Do you have the schematic? Most of the designs should work. One transistor would pull the serial data line low. The other transistor was used to buffer the receive line IIRC.

  3. #3
    Fuel Injected!
    Join Date
    Jun 2015
    Posts
    123
    Have you read this thread on the max232 chip? http://www.gearhead-efi.com/Fuel-Inj...ghlight=Max232
    I originally made a two transistor cable, but couldn't get it to work. This chip works perfect and it's fast. Oh, and it's cheap too!
    I just use paperclips to interface with the aldl port.

  4. #4
    Carb and Points!
    Join Date
    May 2014
    Posts
    6
    I have tried a couple of times to put one together, but have not got them to work with my 747 ecm. Not sure what issues is, there is two different circuits that have seen. What ecm do you have that worked with maxx232 chip, did you buy it already put together? I really thank you for replying

  5. #5
    Fuel Injected!
    Join Date
    Oct 2013
    Posts
    703
    You could use a USB to TTL serial converter. About $5 shipped from China or $10-$15 from US sources. I can dig up the thread if you're interested to see the part and how to connect.

  6. #6
    Carb and Points!
    Join Date
    May 2014
    Posts
    6
    yeah I might want to try it, thx

  7. #7
    Fuel Injected!
    Join Date
    Oct 2013
    Posts
    703
    http://www.gearhead-efi.com/Fuel-Inj...(94-95-Camaro)

    Use a 1N914 diode and a 1k resistor. I have only tried the JY-MCU boards and they worked for me, but any FT232RL chip based board should work.

    The only thing to note is that apparently there are some counterfeit FT232RL chips around that don't work with the official FTDI drivers. The JY-MCU ebay listing did state it was an original FT232RL chip.

  8. #8
    Fuel Injected!
    Join Date
    Jun 2015
    Posts
    123
    Quote Originally Posted by tucson kid View Post
    I have tried a couple of times to put one together, but have not got them to work with my 747 ecm. Not sure what issues is, there is two different circuits that have seen. What ecm do you have that worked with maxx232 chip, did you buy it already put together? I really thank you for replying
    I've used that max232 ttl board with both 160 (various fiero ecms) and 8192 baud (7730) ecms. Also used it with tuner pro and aldldroid.
    The chip comes mounted in a breakout board and all you have to do it push the supplied breakout wires onto the correct pins and away you go.
    My two transistor board that i ruined started out as a one transistor for 160baud, then i did an ecm swap and built a two transistor for 8192, but i never could get it to connect. I gave up and bought the chip and never looked back.

  9. #9
    Super Moderator
    Join Date
    Mar 2011
    Location
    Camden, MI
    Age
    28
    Posts
    3,000
    i had the same issue with a 2-transistor setup, worked fine for 160 baud, never got it to function with an 8192.

    I've done both MAX232 and USB/UART bridges, both work great in any application I've tried them in. if you go the USB route, the FT232 is the most consistent route(even if you have to use an older set of drivers if you manage to pick up a cloned chip), though the CP2012 works too, IIRC. have to modify the driver though.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


Similar Threads

  1. AutoProm ADC Interface Channels Set up in TunerPro!
    By EagleMark in forum TunerPro Tuning Talk
    Replies: 37
    Last Post: 05-17-2016, 02:17 PM
  2. Bench interface for LT1 PCM
    By 95_C4 in forum GM EFI Systems
    Replies: 12
    Last Post: 01-13-2016, 07:08 AM
  3. LS1b PCM, A/C Type
    By Lextech in forum OBDII Tuning
    Replies: 6
    Last Post: 09-07-2013, 03:27 PM
  4. USB cable to Tuner Pro interface
    By sgtpoliteness in forum TunerPro Tuning Talk
    Replies: 2
    Last Post: 04-29-2013, 03:04 PM
  5. Options for data type and stock units?
    By EagleMark in forum TunerPro Tuning Talk
    Replies: 0
    Last Post: 01-22-2012, 09:30 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
  •